Boardwalk Pipeline Partners, LP Presentation Networks

Line Image Concept Label Concept Type Period type Balance Concept name
* Network: (1000 - Statement - Condensed Consolidated Balance Sheets)
1 us-gaap: CONDENSED CONSOLIDATED BALANCE SHEETS xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
2 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
3 us-gaap: ASSETS xbrli:stringItemType duration us-gaap:AssetsAbstract
4 us-gaap: Current Assets: xbrli:stringItemType duration us-gaap:AssetsCurrentAbstract
5 us-gaap: Cash and cash equivalents xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
6 us-gaap: Short-term investments xbrli:monetaryItemType instant debit us-gaap:ShortTermInvestments
7 us-gaap: Receivables: xbrli:stringItemType duration us-gaap:ReceivablesNetCurrentAbstract
8 us-gaap: Trade, net xbrli:monetaryItemType instant debit us-gaap:ReceivablesNetCurrent
9 us-gaap: Other xbrli:monetaryItemType instant debit us-gaap:OtherReceivables
10 us-gaap: Gas transportation receivables xbrli:monetaryItemType instant debit us-gaap:GasImbalanceAssetLiability
11 bwp: Storage xbrli:monetaryItemType instant debit bwp:GasImbalanceAssetLiabilityStorage
12 us-gaap: Inventories xbrli:monetaryItemType instant debit us-gaap:InventoryNet
13 us-gaap: Costs recoverable from customers xbrli:monetaryItemType instant debit us-gaap:RegulatoryAssetsCurrent
14 us-gaap: Gas stored underground xbrli:monetaryItemType instant debit us-gaap:EnergyRelatedInventoryGasStoredUnderground
15 us-gaap: Prepayments xbrli:monetaryItemType instant debit us-gaap:PrepaidExpenseCurrent
16 us-gaap: Other current assets xbrli:monetaryItemType instant debit us-gaap:OtherAssetsCurrent
17 us-gaap: Total current assets xbrli:monetaryItemType instant debit us-gaap:AssetsCurrent
18 us-gaap: Property, Plant and Equipment: xbrli:stringItemType duration us-gaap:PropertyPlantAndEquipmentAbstract
19 bwp: Natural gas transmission plant xbrli:monetaryItemType instant debit bwp:NaturalGasTransmissionPlant
20 bwp: Other natural gas plant xbrli:monetaryItemType instant bwp:OtherNaturalGasPlant
21 us-gaap: Construction work-in-progress xbrli:monetaryItemType instant debit us-gaap:ConstructionInProgressGross
22 us-gaap: Property, Plant and Equipment: Gross xbrli:monetaryItemType instant debit us-gaap:PropertyPlantAndEquipmentGross
23 us-gaap: Less-accumulated depreciation and amortization xbrli:monetaryItemType instant credit us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
24 us-gaap: Property, plant and equipment, net xbrli:monetaryItemType instant debit us-gaap:PropertyPlantAndEquipmentNet
25 bwp: Other Assets: xbrli:stringItemType duration bwp:OtherAssetsAbstract
26 us-gaap: Goodwill xbrli:monetaryItemType instant debit us-gaap:Goodwill
27 us-gaap: Gas stored underground xbrli:monetaryItemType instant debit us-gaap:InventoryGasInStorageUndergroundNoncurrent
28 us-gaap: Costs recoverable from customers xbrli:monetaryItemType instant debit us-gaap:RegulatoryAssetsNoncurrent
29 us-gaap: Other xbrli:monetaryItemType instant debit us-gaap:OtherAssetsNoncurrent
30 us-gaap: Total other assets xbrli:monetaryItemType instant debit us-gaap:AssetsNoncurrent
31 us-gaap: Total Assets xbrli:monetaryItemType instant debit us-gaap:Assets
32 us-gaap: LIABILITIES AND PARTNERS' CAPITAL xbrli:stringItemType duration us-gaap:LiabilitiesAndStockholdersEquityAbstract
33 us-gaap: Current Liabilities: xbrli:stringItemType duration us-gaap:LiabilitiesCurrentAbstract
34 us-gaap: Payables: xbrli:stringItemType duration us-gaap:AccountsPayableCurrentAbstract
35 us-gaap: Trade xbrli:monetaryItemType instant credit us-gaap:AccountsPayableCurrent
36 us-gaap: Affiliates xbrli:monetaryItemType instant credit us-gaap:AccountsPayableRelatedPartiesCurrentAndNoncurrent
37 us-gaap: Other xbrli:monetaryItemType instant credit us-gaap:AccountsPayableOtherCurrent
38 bwp: Gas transportation payables xbrli:monetaryItemType instant credit bwp:TransportationAndExchange
39 bwp: Storage xbrli:monetaryItemType instant credit bwp:Storage
40 us-gaap: Accrued taxes, other xbrli:monetaryItemType instant credit us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent
41 us-gaap: Accrued interest xbrli:monetaryItemType instant credit us-gaap:InterestPayableCurrentAndNoncurrent
42 us-gaap: Accrued interest - affiliate xbrli:monetaryItemType instant credit us-gaap:DueToRelatedPartiesCurrent
43 us-gaap: Accrued payroll and employee benefits xbrli:monetaryItemType instant credit us-gaap:EmployeeRelatedLiabilitiesCurrent
44 us-gaap: Construction retainage xbrli:monetaryItemType instant credit us-gaap:ConstructionPayableCurrentAndNoncurrent
45 us-gaap: Deferred income xbrli:monetaryItemType instant credit us-gaap:DeferredRevenue
46 us-gaap: Other current liabilities xbrli:monetaryItemType instant credit us-gaap:OtherLiabilitiesCurrent
47 us-gaap: Total current liabilities xbrli:monetaryItemType instant credit us-gaap:LiabilitiesCurrent
48 us-gaap: Long-term debt xbrli:monetaryItemType instant credit us-gaap:UnsecuredLongTermDebt
49 us-gaap: Long -term debt - affiliate xbrli:monetaryItemType instant credit us-gaap:NotesPayableRelatedPartiesNoncurrent
50 us-gaap: Total long-term debt xbrli:monetaryItemType instant credit us-gaap:LongTermDebtNoncurrent
51 us-gaap: Other Liabilities and Deferred Credits: xbrli:stringItemType duration us-gaap:LiabilitiesNoncurrentAbstract
52 us-gaap: Pension liability xbrli:monetaryItemType instant credit us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
53 us-gaap: Asset retirement obligation xbrli:monetaryItemType instant credit us-gaap:AssetRetirementObligationsNoncurrent
54 bwp: Provision for other asset retirement xbrli:monetaryItemType instant credit bwp:ProvisionForOtherAssetRetirement
55 us-gaap: Payable to affiliate xbrli:monetaryItemType instant credit us-gaap:DueToRelatedPartiesNoncurrent
56 us-gaap: Other xbrli:monetaryItemType instant credit us-gaap:OtherLiabilitiesNoncurrent
57 us-gaap: Total other liabilities and deferred credits xbrli:monetaryItemType instant credit us-gaap:LiabilitiesNoncurrent
58 us-gaap: Commitments And Contingencies xbrli:stringItemType duration us-gaap:CommitmentsAndContingencies2009
59 us-gaap: Partners' Capital: xbrli:stringItemType duration us-gaap:PartnersCapitalAbstract
60 bwp: Common units - 169.7 million units outstanding as of September 30, 2009, and 154.9 million units outstanding as of December 31, 2008 xbrli:monetaryItemType instant credit bwp:LimitedPartnerCapitalAccountCommonUnits
61 bwp: Class B units - 22.9 million units outstanding as of September 30, 2009, and December 31, 2008 xbrli:monetaryItemType instant bwp:LimitedPartnerCapitalAccountClassBUnits
62 bwp: Limited partner capital account - subordinated units xbrli:monetaryItemType instant credit bwp:LimitedPartnerCapitalAccountSubordinatedUnits
63 us-gaap: General partner xbrli:monetaryItemType instant credit us-gaap:GeneralPartnersCapitalAccount
64 us-gaap: Accumulated other comprehensive income, net of tax xbrli:monetaryItemType instant credit us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
65 us-gaap: Total partners' capital xbrli:monetaryItemType instant credit us-gaap:PartnersCapital
66 us-gaap: Total Liabilities and Partners' Capital xbrli:monetaryItemType instant credit us-gaap:LiabilitiesAndPartnersCapital
* Network: (1010 - Statement - Parenthetical Condensed Consolidated Balance Sheets)
67 us-gaap: CONDENSED CONSOLIDATED BALANCE SHEETS xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
68 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
69 bwp: Common units xbrli:sharesItemType instant bwp:LimitedPartnerCapitalAccountCommonUnitsOutstanding
70 bwp: Class B units xbrli:sharesItemType instant bwp:LimitedPartnerCapitalAccountClassBUnitsOutstanding
* Network: (2000 - Statement - Condensed Consolidated Statements of Income)
71 us-gaap: CONDENSED CONSOLIDATED STATEMENTS OF INCOME xbrli:stringItemType duration us-gaap:IncomeStatementAbstract
72 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
73 us-gaap: Operating Revenues: xbrli:stringItemType duration us-gaap:RevenuesAbstract
74 bwp: Gas transportation xbrli:monetaryItemType duration credit bwp:GasTransportationRevenues
75 bwp: Parking and lending xbrli:monetaryItemType duration credit bwp:ParkingAndLendingRevenue
76 us-gaap: Gas storage xbrli:monetaryItemType duration credit us-gaap:NaturalGasStorageRevenue
77 bwp: Other revenue xbrli:monetaryItemType duration bwp:OtherOperatingRevenue
78 us-gaap: Total operating revenues xbrli:monetaryItemType duration credit us-gaap:Revenues
79 us-gaap: Operating Costs and Expenses: xbrli:stringItemType duration us-gaap:OperatingCostsAndExpensesAbstract
80 bwp: Fuel and gas transportation xbrli:monetaryItemType duration debit bwp:FuelAndGasTransportationExpense
81 bwp: Operation and maintenance xbrli:monetaryItemType duration debit bwp:OperationAndMaintenanceExpenses
82 us-gaap: Administrative and general xbrli:monetaryItemType duration debit us-gaap:GeneralAndAdministrativeExpense
83 us-gaap: Depreciation and amortization xbrli:monetaryItemType duration debit us-gaap:DepreciationAndAmortization
84 us-gaap: Contract settlement gain xbrli:monetaryItemType duration credit us-gaap:GainLossOnContractTermination
85 us-gaap: Asset impairment xbrli:monetaryItemType duration debit us-gaap:OtherAssetImpairmentCharges
86 us-gaap: Net loss (gain) on disposal of operating assets and related contracts xbrli:monetaryItemType duration credit us-gaap:GainLossOnDispositionOfOtherAssets
87 us-gaap: Taxes other than income taxes xbrli:monetaryItemType duration debit us-gaap:TaxesExcludingIncomeAndExciseTaxes
88 us-gaap: Total operating costs and expenses xbrli:monetaryItemType duration debit us-gaap:OperatingExpenses
89 us-gaap: Operating income xbrli:monetaryItemType duration credit us-gaap:OperatingIncomeLoss
90 us-gaap: Other Deductions (Income): xbrli:stringItemType duration us-gaap:InterestAndDebtExpenseAbstract
91 us-gaap: Interest expense xbrli:monetaryItemType duration debit us-gaap:InterestExpense
92 us-gaap: Interest expense - affiliates xbrli:monetaryItemType duration debit us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
93 us-gaap: Interest income xbrli:monetaryItemType duration credit us-gaap:InvestmentIncomeInterest
94 bwp: Interest income from affiliates, net xbrli:monetaryItemType duration credit bwp:InterestIncomeFromAffiliatesNet
95 us-gaap: Miscellaneous other income, net xbrli:monetaryItemType duration credit us-gaap:OtherNonoperatingIncomeExpense
96 us-gaap: Total other deductions xbrli:monetaryItemType duration credit us-gaap:NonoperatingIncomeExpense
97 bwp: Income before income taxes xbrli:monetaryItemType duration credit bwp:IncomeBeforeIncomeTaxes
98 us-gaap: Income taxes (benefits) xbrli:monetaryItemType duration debit us-gaap:IncomeTaxExpenseBenefit
99 us-gaap: Net Income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
100 us-gaap: Calculation of limited partners' interest in Net income: xbrli:stringItemType duration us-gaap:EarningsPerGeneralPartnershipUnitAbstract
101 bwp: Common units us-types:perShareItemType duration bwp:NetIncomePerLimitedPartnerCommonUnit
102 bwp: Class B units us-types:perShareItemType duration bwp:NetIncomePerLimitedPartnerClassBUnit
103 bwp: Subordinated units us-types:perShareItemType duration bwp:NetIncomePerLimitedPartnerSubordinatedUnit
104 bwp: Cash distribution to common and subordinated units us-types:perShareItemType duration bwp:CashDistributionToLimitedPartnerCommonAndSubordinatedUnit
105 bwp: Cash distribution to class B units us-types:perShareItemType duration bwp:CashDistributionToClassBUnits
106 bwp: Weighted Average Limited Partnership Common Units Outstanding xbrli:sharesItemType duration bwp:WeightedAverageLimitedPartnershipCommonUnitsOutstanding
107 bwp: Weighted Average Limited Partnership class B Units Outstanding xbrli:sharesItemType duration bwp:WeightedAverageLimitedPartnershipClassBUnitsOutstanding
108 bwp: Weighted Average Limited Partnership Subordinated Units Outstanding xbrli:sharesItemType duration bwp:WeightedAverageLimitedPartnershipSubordinatedUnitsOutstanding
109 bwp: Net income attributable to limited partner - common units xbrli:monetaryItemType duration bwp:NetIncomeAttributableToLimitedPartnerCommonUnits
* Network: (3000 - Statement - Condensed Consolidated Statements of Cash Flows)
110 us-gaap: CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS xbrli:stringItemType duration us-gaap:StatementOfCashFlowsAbstract
111 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
112 us-gaap: OPERATING ACTIVITIES: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract
113 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
114 us-gaap: Adjustments to reconcile to cash provided by operations: xbrli:stringItemType duration us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
115 us-gaap: Depreciation and amortization xbrli:monetaryItemType duration debit us-gaap:DepreciationAndAmortization
116 us-gaap: Amortization of deferred costs xbrli:monetaryItemType duration debit us-gaap:AmortizationOfDeferredCharges
117 us-gaap: Amortization of acquired executory contracts xbrli:monetaryItemType duration debit us-gaap:AmortizationOfAcquisitionCosts
118 us-gaap: Provision for deferred income taxes xbrli:monetaryItemType duration debit us-gaap:DeferredIncomeTaxExpenseBenefit
119 us-gaap: Asset impairment xbrli:monetaryItemType duration debit us-gaap:OtherAssetImpairmentCharges
120 us-gaap: Net loss (gain) on disposal of operating assets and related contracts xbrli:monetaryItemType duration credit us-gaap:GainLossOnDispositionOfOtherAssets
121 us-gaap: Changes in operating assets and liabilities: xbrli:stringItemType duration us-gaap:IncreaseDecreaseInOperatingCapitalAbstract
122 us-gaap: Trade and other receivables xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables
123 us-gaap: Increase Decrease in other accrued liabilities xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInOtherAccruedLiabilities
124 us-gaap: Gas receivables and storage assets xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInGasImbalanceReceivable
125 us-gaap: Costs recoverable from customers xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInOtherRegulatoryAssets
126 us-gaap: Inventories xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories
127 us-gaap: Other assets xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInOtherOperatingAssets
128 us-gaap: Trade and other payables xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccountsPayable
129 us-gaap: Other payables, affiliates xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccountsPayableRelatedParties
130 bwp: Gas payables xbrli:monetaryItemType duration debit bwp:IncreaseDecreaseInGasImbalancePayable
131 us-gaap: Accrued liabilities xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccruedLiabilities
132 us-gaap: Other liabilities xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
133 us-gaap: Net cash provided by operating activities xbrli:monetaryItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivities
134 us-gaap: INVESTING ACTIVITIES: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract
135 us-gaap: Capital expenditures xbrli:monetaryItemType duration credit us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
136 us-gaap: Proceeds from sale of operating assets xbrli:monetaryItemType duration debit us-gaap:ProceedsFromSaleOfProductiveAssets
137 us-gaap: Proceeds from insurance reimbursements and other recoveries xbrli:monetaryItemType duration debit us-gaap:ProceedsFromInsuranceSettlementInvestingActivities
138 us-gaap: Advances to affiliates, net xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseDueFromAffiliates
139 us-gaap: Sales of short-term investments xbrli:monetaryItemType duration credit us-gaap:PaymentsToAcquireShortTermInvestments
140 us-gaap: Sales of short-term investments xbrli:monetaryItemType duration debit us-gaap:ProceedsFromSaleOfShortTermInvestments
141 us-gaap: Net cash used in investing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInInvestingActivities
142 us-gaap: FINANCING ACTIVITIES: xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract
143 us-gaap: Proceeds from long-term debt, net of issuance costs xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOfUnsecuredDebt
144 us-gaap: Proceeds from borrowings on revolving credit agreement xbrli:monetaryItemType duration debit us-gaap:ProceedsFromLongTermLinesOfCredit
145 us-gaap: Repayment of borrowings on revolving credit agreement xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfLongTermLinesOfCredit
146 us-gaap: Proceeds from notes payable xbrli:monetaryItemType duration debit us-gaap:ProceedsFromNotesPayable
147 us-gaap: Payments on note payable xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfNotesPayable
148 us-gaap: Proceeds from long-term debt - affiliate xbrli:monetaryItemType duration debit us-gaap:ProceedsFromRelatedPartyDebt
149 us-gaap: Repayment of long-term debt - affiliate xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfRelatedPartyDebt
150 us-gaap: Distributions xbrli:monetaryItemType duration debit us-gaap:PartnersCapitalAccountDistributions
151 us-gaap: Proceeds from sale of common units xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOfCommonLimitedPartnersUnits
152 bwp: Proceeds from sale of class B units xbrli:monetaryItemType duration debit bwp:ProceedsFromSaleOfClassBLimitedPartnerUnits
153 us-gaap: Capital contribution from general partner xbrli:monetaryItemType duration debit us-gaap:ProceedsFromOtherEquity
154 us-gaap: Net cash provided by financing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInFinancingActivities
155 us-gaap: (Decrease) increase in cash and cash equivalents xbrli:monetaryItemType duration us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease
156 us-gaap: Cash and cash equivalents at beginning of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
157 us-gaap: Cash and cash equivalents at end of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
* Network: (4000 - Statement - Condensed Consolidated Statements of Changes in Partners Capital)
158 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
159 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
160 us-gaap: Statement, Equity Components [Axis] xbrli:stringItemType duration us-gaap:StatementEquityComponentsAxis
161 us-gaap: Equity Component [Domain] us-types:domainItemType duration us-gaap:EquityComponentDomain
162 bwp: Common Units [Member] us-types:domainItemType duration bwp:CommonUnitsMember
163 bwp: Class B Units [Member] us-types:domainItemType duration bwp:ClassBUnitsMember
164 bwp: Subordinated Units [Member] us-types:domainItemType duration bwp:SubordinatedUnitsMember
165 us-gaap: General Partner [Member] us-types:domainItemType duration us-gaap:GeneralPartnerMember
166 us-gaap: Accumulated Other Comprehensive Income [Member] us-types:domainItemType duration us-gaap:AccumulatedOtherComprehensiveIncomeMember
167 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
168 us-gaap: Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
169 us-gaap: Add (deduct): xbrli:stringItemType duration us-gaap:AdjustmentsToAdditionalPaidInCapitalAbstract
170 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
171 us-gaap: Distributions xbrli:monetaryItemType duration debit us-gaap:PartnersCapitalAccountDistributions
172 us-gaap: Sale of common units, net of related transaction costs xbrli:monetaryItemType duration credit us-gaap:PartnersCapitalAccountSaleOfUnits
173 bwp: Sale of class B units xbrli:monetaryItemType duration credit bwp:SaleOfClassBUnits
174 bwp: Capital contribution from general partner xbrli:monetaryItemType duration bwp:CapitalContributionFromGeneralPartner
175 us-gaap: Other comprehensive loss xbrli:monetaryItemType duration credit us-gaap:ComprehensiveIncomeNetOfTax
176 us-gaap: Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
* Network: (4010 - Statement - Parenthetical Condensed Consolidated Statements of Changes in Partners Capital)
177 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
178 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
179 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
180 us-gaap: Add (deduct): xbrli:stringItemType duration us-gaap:AdjustmentsToAdditionalPaidInCapitalAbstract
181 us-gaap: common units xbrli:sharesItemType duration us-gaap:PartnersCapitalAccountUnitsSaleOfUnits
182 bwp: class B units xbrli:sharesItemType duration bwp:ClassBUnit
* Network: (5000 - Statement - Condensed Consolidated Statements of Comprehensive Income)
183 us-gaap: CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME xbrli:stringItemType duration us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract
184 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
185 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
186 us-gaap: (Loss) gain on cash flow hedges xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease
187 us-gaap: Reclassification adjustment transferred to Net income from cash flow hedges xbrli:monetaryItemType duration debit us-gaap:OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax
188 us-gaap: Pension and other postretirement benefits costs xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease
189 us-gaap: Total Comprehensive Income xbrli:monetaryItemType duration credit us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
* Network: (6010 - Disclosure - Basis of Presentation)
190 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
191 us-gaap: Basis of Presentation us-types:textBlockItemType duration us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock
* Network: (6020 - Disclosure - Gas Stored Underground and Gas Receivables and Payables)
192 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
193 us-gaap: Gas Stored Underground and Gas Receivables and Payables us-types:textBlockItemType duration us-gaap:ConcentrationRiskDisclosureTextBlock
* Network: (6030 - Disclosure - Derivative Financial Instruments)
194 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
195 us-gaap: Derivative Financial Instruments us-types:textBlockItemType duration us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock
* Network: (6040 - Disclosure - Income Taxes)
196 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
197 us-gaap: Income Taxes us-types:textBlockItemType duration us-gaap:IncomeTaxDisclosureTextBlock
* Network: (6050 - Disclosure - Commitments and Contingencies)
198 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
199 us-gaap: Commitments and Contingencies us-types:textBlockItemType duration us-gaap:CommitmentsAndContingenciesDisclosureTextBlock
* Network: (6060 - Disclosure - Cash Distributions and Net Income per Unit)
200 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
201 us-gaap: Cash Distributions and Net Income per Unit us-types:textBlockItemType duration us-gaap:PartnersCapitalNotesDisclosureTextBlock
* Network: (6070 - Disclosure - Financing)
202 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
203 us-gaap: Financing us-types:textBlockItemType duration us-gaap:ScheduleOfSaleOfStockBySubsidiaryOrEquityMethodInvesteeDisclosureTextBlock
* Network: (6080 - Disclosure - Property, Plant and Equipment)
204 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
205 us-gaap: Property, Plant and Equipment us-types:textBlockItemType duration us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock
* Network: (6090 - Disclosure - Disposition of Coal Reserve)
206 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
207 bwp: Disposition of Coal Reserve us-types:textBlockItemType duration bwp:DispositionOfCoalReserveTextBlock
* Network: (6100 - Disclosure - Employee Benefits)
208 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
209 us-gaap: Employee Benefits us-types:textBlockItemType duration us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock
* Network: (6110 - Disclosure - Related Party Transactions)
210 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
211 us-gaap: Related Party Transactions us-types:textBlockItemType duration us-gaap:RelatedPartyTransactionsDisclosureTextBlock
* Network: (6120 - Disclosure - Accumulated Other Comprehensive Income (Loss))
212 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
213 us-gaap: Accumulated Other Comprehensive Income (Loss) us-types:textBlockItemType duration us-gaap:ComprehensiveIncomeNoteTextBlock
* Network: (6130 - Disclosure - Guarantee of Securities of Subsidiaries)
214 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
215 us-gaap: Guarantee of Securities of Subsidiaries us-types:textBlockItemType duration us-gaap:ScheduleOfGuaranteeObligationsTextBlock
* Network: (6140 - Disclosure - Financial Instruments)
216 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
217 us-gaap: Financial Instruments us-types:textBlockItemType duration us-gaap:FairValueDisclosuresTextBlock
* Network: (6150 - Disclosure - Supplemental Disclosure of Cash Flow Information)
218 bwp: Notes to Financial Statements [Abstract] xbrli:stringItemType duration bwp:NotesToFinancialStatementsAbstract
219 us-gaap: Supplemental Disclosure of Cash Flow Information us-types:textBlockItemType duration us-gaap:CashFlowSupplementalDisclosuresTextBlock
* Network: (995200 - Document - Document Information)
220 dei: Document Information [Line Items] xbrli:stringItemType duration dei:DocumentInformationLineItems
221 dei: Document Type us-types:SECReportItemType duration dei:DocumentType
222 dei: Amendment Flag xbrli:booleanItemType duration dei:AmendmentFlag
223 dei: Amendment Description xbrli:stringItemType duration dei:AmendmentDescription
224 dei: Document Period End Date xbrli:dateItemType duration dei:DocumentPeriodEndDate
* Network: (995400 - Document - Entity Information)
225 dei: Entity Information [Line Items] xbrli:stringItemType duration dei:EntityInformationLineItems
226 dei: Entity Registrant Name xbrli:normalizedStringItemType duration dei:EntityRegistrantName
227 dei: Entity Central Index Key us-types:centralIndexKeyItemType duration dei:EntityCentralIndexKey
228 dei: Current Fiscal Year End Date xbrli:gMonthDayItemType duration dei:CurrentFiscalYearEndDate
229 dei: Entity Well-known Seasoned Issuer us-types:yesNoItemType duration dei:EntityWellKnownSeasonedIssuer
230 dei: Entity Voluntary Filers us-types:yesNoItemType duration dei:EntityVoluntaryFilers
231 dei: Entity Current Reporting Status us-types:yesNoItemType duration dei:EntityCurrentReportingStatus
232 dei: Entity Filer Category us-types:filerCategoryItemType duration dei:EntityFilerCategory
233 dei: Entity Public Float xbrli:monetaryItemType instant credit dei:EntityPublicFloat
234 dei: Entity Common Stock, Shares Outstanding xbrli:sharesItemType instant dei:EntityCommonStockSharesOutstanding