AGL RESOURCES INC Presentation Networks

Line Image Concept Label Concept Type Period type Balance Concept name
* Network: (100 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION)
1 us-gaap: Statement of Financial Position [Unaudited) xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
2 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
3 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
4 us-gaap: Assets [Abstract] xbrli:stringItemType duration us-gaap:AssetsAbstract
5 us-gaap: Current assets xbrli:stringItemType duration us-gaap:AssetsCurrentAbstract
6 us-gaap: Cash and cash equivalents xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
7 us-gaap: Inventories, net (Note 1) xbrli:monetaryItemType instant debit us-gaap:InventoryNet
8 us-gaap: Receivables xbrli:stringItemType duration us-gaap:AccountsReceivableNetCurrentAbstract
9 agl: Energy marketing receivables (Note 1) xbrli:monetaryItemType instant debit agl:EnergyMarketingReceivables
10 us-gaap: Gas, unbilled and other receivables xbrli:monetaryItemType instant debit us-gaap:AccountsReceivableGrossCurrent
11 us-gaap: Less allowance for uncollectible accounts xbrli:monetaryItemType instant credit us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
12 us-gaap: Total receivables xbrli:monetaryItemType instant debit us-gaap:AccountsReceivableNetCurrent
13 us-gaap: Derivative financial instruments - current portion (Note 2 and Note 3) xbrli:monetaryItemType instant debit us-gaap:DerivativeAssetsCurrent
14 us-gaap: Prepaid taxes xbrli:monetaryItemType instant debit us-gaap:PrepaidTaxes
15 agl: Unrecovered pipeline replacement program costs - current portion (Note 1) xbrli:monetaryItemType instant debit agl:UnrecoveredPipelineReplacementProgramCostsCurrentPortion
16 agl: Unrecovered environmental remediation costs - current portion (Note 1) xbrli:monetaryItemType instant debit agl:UnrecoveredEnvironmentalRemediationCostsCurrentPortion
17 us-gaap: Other current assets xbrli:monetaryItemType instant debit us-gaap:OtherAssetsCurrent
18 us-gaap: Total current assets xbrli:monetaryItemType instant debit us-gaap:AssetsCurrent
19 us-gaap: Long-term assets and other deferred debits xbrli:stringItemType duration us-gaap:AssetsNoncurrentAbstract
20 us-gaap: Derivative Instruments and Hedges, Noncurrent xbrli:monetaryItemType instant debit us-gaap:DerivativeInstrumentsAndHedgesNoncurrent
21 us-gaap: Property, plant and equipment xbrli:monetaryItemType instant debit us-gaap:PropertyPlantAndEquipmentGross
22 us-gaap: Less accumulated depreciation xbrli:monetaryItemType instant credit us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
23 us-gaap: Property, plant and equipment-net xbrli:monetaryItemType instant debit us-gaap:PropertyPlantAndEquipmentNet
24 us-gaap: Goodwill xbrli:monetaryItemType instant debit us-gaap:Goodwill
25 agl: Unrecovered pipeline replacement program costs (Note 1) xbrli:monetaryItemType instant debit agl:UnrecoveredPipelineReplacementProgramCosts
26 agl: Unrecovered environmental remediation costs (Note 1) xbrli:monetaryItemType instant debit agl:UnrecoveredEnvironmentalRemediationCosts
27 us-gaap: Derivative financial instruments (Note 2 and Note 3) xbrli:monetaryItemType instant debit us-gaap:DerivativeAssetsNoncurrent
28 us-gaap: Other xbrli:monetaryItemType instant debit us-gaap:OtherAssetsNoncurrent
29 us-gaap: Total long-term assets and other deferred debits xbrli:monetaryItemType instant debit us-gaap:AssetsNoncurrent
30 us-gaap: Total assets xbrli:monetaryItemType instant debit us-gaap:Assets
31 us-gaap: Liabilities and Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:LiabilitiesAndStockholdersEquityAbstract
32 us-gaap: Liabilities [Abstract] xbrli:stringItemType duration us-gaap:LiabilitiesAbstract
33 us-gaap: Current liabilities xbrli:stringItemType duration us-gaap:LiabilitiesCurrentAbstract
34 us-gaap: Short-term debt (Note 6) xbrli:monetaryItemType instant credit us-gaap:DebtCurrent
35 agl: Energy marketing trade payables (Note 1) xbrli:monetaryItemType instant credit agl:EnergyMarketingTradePayables
36 us-gaap: Accounts payable - trade xbrli:monetaryItemType instant credit us-gaap:AccountsPayable
37 us-gaap: Accrued expenses xbrli:monetaryItemType instant credit us-gaap:AccruedLiabilitiesCurrent
38 agl: Accrued pipeline replacement program costs - current portion (Note 1) xbrli:monetaryItemType instant credit agl:AccruedPipelineReplacementProgramCostsCurrentPortion
39 us-gaap: Customer deposits xbrli:monetaryItemType instant credit us-gaap:CustomerDepositsCurrent
40 us-gaap: Derivative financial instruments - current portion (Note 2 and Note 3) xbrli:monetaryItemType instant credit us-gaap:DerivativeLiabilitiesCurrent
41 agl: Accrued environmental remediation liabilities - current portion (Note 1 and Note 7) xbrli:monetaryItemType instant credit agl:AccruedEnvironmentalRemediationCostsCurrentPortion
42 us-gaap: Derivative Instruments and Hedges, Liabilities xbrli:monetaryItemType instant credit us-gaap:DerivativeInstrumentsAndHedgesLiabilities
43 us-gaap: Deferred natural gas costs (Note 1) xbrli:monetaryItemType instant credit us-gaap:DeferredGasPurchasesCurrent
44 us-gaap: Other current liabilities xbrli:monetaryItemType instant credit us-gaap:OtherLiabilitiesCurrent
45 us-gaap: Total current liabilities xbrli:monetaryItemType instant credit us-gaap:LiabilitiesCurrent
46 us-gaap: Long-term liabilities and other deferred credits xbrli:stringItemType duration us-gaap:LiabilitiesNoncurrentAbstract
47 us-gaap: Long-term debt (Note 6) xbrli:monetaryItemType instant credit us-gaap:LongTermDebtAndCapitalLeaseObligations
48 us-gaap: Accumulated deferred income taxes xbrli:monetaryItemType instant credit us-gaap:DeferredTaxLiabilitiesNoncurrent
49 us-gaap: Accumulated removal costs (Note 1) xbrli:monetaryItemType instant credit us-gaap:AssetRetirementObligationsNoncurrent
50 us-gaap: Accrued pension obligations (Note 4) xbrli:monetaryItemType instant credit us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
51 agl: Accrued environmental remediation liabilities (Note 1 and Note 7) xbrli:monetaryItemType instant credit agl:AccruedEnvironmentalRemediationCosts
52 agl: Accrued pipeline replacement program costs (Note 1) xbrli:monetaryItemType instant credit agl:AccruedPipelineReplacementProgramCosts
53 us-gaap: Accrued postretirement benefit costs (Note 4) xbrli:monetaryItemType instant credit us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
54 us-gaap: Derivative financial instruments (Note 2 and Note 3) xbrli:monetaryItemType instant credit us-gaap:DerivativeLiabilitiesNoncurrent
55 us-gaap: Other long-term liabilities and other deferred credits xbrli:monetaryItemType instant credit us-gaap:OtherLiabilitiesNoncurrent
56 us-gaap: Total long-term liabilities and other deferred credits xbrli:monetaryItemType instant credit us-gaap:LiabilitiesNoncurrent
57 us-gaap: Total liabilities and other deferred credits xbrli:monetaryItemType instant credit us-gaap:Liabilities
58 us-gaap: Commitments and contingencies (Note 7) xbrli:stringItemType duration us-gaap:CommitmentsAndContingencies2009
59 us-gaap: Equity xbrli:stringItemType duration us-gaap:StockholdersEquityAbstract
60 us-gaap: Common Stock, Value, Issued xbrli:monetaryItemType instant credit us-gaap:CommonStockValue
61 us-gaap: Additional Paid in Capital xbrli:monetaryItemType instant credit us-gaap:AdditionalPaidInCapital
62 us-gaap: Retained Earnings (Accumulated Deficit) xbrli:monetaryItemType instant credit us-gaap:RetainedEarningsAccumulatedDeficit
63 us-gaap: Treasury Stock, Value xbrli:monetaryItemType instant debit us-gaap:TreasuryStockValue
64 us-gaap: Accumulated Other Comprehensive Income (Loss), Net of Tax xbrli:monetaryItemType instant credit us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
65 us-gaap: AGL Resources Inc. common shareholders' equity, $5 par value 750,000,000 shares authorized xbrli:monetaryItemType instant credit us-gaap:StockholdersEquity
66 us-gaap: Noncontrolling interest (Note 5) xbrli:monetaryItemType instant credit us-gaap:MinorityInterest
67 us-gaap: Total equity xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
68 us-gaap: Total liabilities and equity xbrli:monetaryItemType instant credit us-gaap:LiabilitiesAndStockholdersEquity
* Network: (110 - Disclosure - Parenthetical Information for Statements of Financial Position)
69 us-gaap: Statement of Financial Position [Unaudited) xbrli:stringItemType duration us-gaap:StatementOfFinancialPositionAbstract
70 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
71 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
72 us-gaap: Common Stock, par value us-types:perShareItemType instant us-gaap:CommonStockParOrStatedValuePerShare
73 us-gaap: Common Stock, shares authorized xbrli:sharesItemType instant us-gaap:CommonStockSharesAuthorized
* Network: (200 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME)
74 us-gaap: Income Statement [Abstract] xbrli:stringItemType duration us-gaap:IncomeStatementAbstract
75 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
76 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
77 us-gaap: Operating revenues xbrli:monetaryItemType duration credit us-gaap:Revenues
78 us-gaap: Operating expenses xbrli:stringItemType duration us-gaap:CostsAndExpensesAbstract
79 us-gaap: Cost of gas xbrli:monetaryItemType duration debit us-gaap:CostOfRevenue
80 us-gaap: Operation and maintenance xbrli:monetaryItemType duration debit us-gaap:OtherSellingGeneralAndAdministrativeExpense
81 us-gaap: Depreciation and amortization xbrli:monetaryItemType duration debit us-gaap:DepreciationAndAmortization
82 us-gaap: Taxes other than income taxes xbrli:monetaryItemType duration debit us-gaap:TaxesOther
83 us-gaap: Total operating expenses xbrli:monetaryItemType duration debit us-gaap:CostsAndExpenses
84 us-gaap: Operating income xbrli:monetaryItemType duration credit us-gaap:OperatingIncomeLoss
85 us-gaap: Other income xbrli:monetaryItemType duration credit us-gaap:OtherNonoperatingIncomeExpense
86 us-gaap: Interest expense, net xbrli:monetaryItemType duration debit us-gaap:InterestExpense
87 us-gaap: Earnings before income taxes xbrli:monetaryItemType duration credit us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
88 us-gaap: Income tax expense xbrli:monetaryItemType duration debit us-gaap:IncomeTaxExpenseBenefit
89 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
90 us-gaap: Less net (loss) income attributable to the noncontrolling interest (Note 5) xbrli:monetaryItemType duration debit us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
91 us-gaap: Net income attributable to AGL Resources Inc. xbrli:monetaryItemType duration credit us-gaap:NetIncomeLoss
92 us-gaap: Per common share data (Note 1) xbrli:stringItemType duration us-gaap:EarningsPerShareAbstract
93 us-gaap: Basic earnings per common share attributable to AGL Resources Inc. common shareholders us-types:perShareItemType duration us-gaap:EarningsPerShareBasic
94 us-gaap: Diluted earnings per common share attributable to AGL Resources Inc. common shareholders us-types:perShareItemType duration us-gaap:EarningsPerShareDiluted
95 us-gaap: Cash dividends declared per common share us-types:perShareItemType duration us-gaap:CommonStockDividendsPerShareCashPaid
96 agl: Weighted-average number of common shares outstanding (Note 1) xbrli:stringItemType duration agl:WeightedAverageNumberOfCommonSharesOutstanding
97 us-gaap: Basic xbrli:sharesItemType duration us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
98 us-gaap: Diluted xbrli:sharesItemType duration us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
* Network: (300 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF EQUITY)
99 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
100 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
101 us-gaap: Statement, Equity Components [Axis] xbrli:stringItemType duration us-gaap:StatementEquityComponentsAxis
102 us-gaap: Equity Component [Domain] us-types:domainItemType duration us-gaap:EquityComponentDomain
103 us-gaap: Common Stock [Member] us-types:domainItemType duration us-gaap:CommonStockMember
104 us-gaap: Accumulated Other Comprehensive Income [Member] us-types:domainItemType duration us-gaap:AccumulatedOtherComprehensiveIncomeMember
105 us-gaap: Additional Paid-in Capital [Member] us-types:domainItemType duration us-gaap:AdditionalPaidInCapitalMember
106 us-gaap: Retained Earnings [Member] us-types:domainItemType duration us-gaap:RetainedEarningsMember
107 us-gaap: Treasury Stock [Member] us-types:domainItemType duration us-gaap:TreasuryStockMember
108 us-gaap: Noncontrolling Interest [Member] us-types:domainItemType duration us-gaap:NoncontrollingInterestMember
109 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
110 us-gaap: AGL Resources Inc. Common Shareholders Equity, Beginning Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
111 us-gaap: Common stock shares, Beginning Balance xbrli:sharesItemType instant us-gaap:SharesIssued
112 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
113 us-gaap: Other comprehensive income (loss) xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease
114 us-gaap: Dividends on common stock xbrli:monetaryItemType duration debit us-gaap:DividendsCommonStock
115 us-gaap: Distributions to noncontrolling interest xbrli:monetaryItemType duration debit us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
116 us-gaap: Issuance of treasury shares, amount xbrli:monetaryItemType duration credit us-gaap:StockIssuedDuringPeriodValueTreasuryStockReissued
117 us-gaap: Issuance of treasury shares, shares xbrli:sharesItemType duration us-gaap:StockIssuedDuringPeriodSharesTreasuryStockReissued
118 us-gaap: Stock-based compensation expense (net of taxes) (Note 1) xbrli:monetaryItemType duration credit us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
119 us-gaap: Stock-based compensation expense, shares (net of taxes) (Note 1) xbrli:sharesItemType duration us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
120 us-gaap: Common stock shares, Ending Balance xbrli:sharesItemType instant us-gaap:SharesIssued
121 us-gaap: AGL Resources Inc. Common Shareholders Equity, Ending Balance xbrli:monetaryItemType instant credit us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
* Network: (310 - Disclosure - Parenthetical Information for Statements of Equity)
122 us-gaap: Statement of Stockholders' Equity [Abstract] xbrli:stringItemType duration us-gaap:StatementOfStockholdersEquityAbstract
123 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
124 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
125 us-gaap: Dividends on common stock, per share us-types:perShareItemType duration us-gaap:CommonStockDividendsPerShareDeclared
* Network: (400 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME)
126 us-gaap: Statement of Income and Comprehensive Income [Abstract] xbrli:stringItemType duration us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract
127 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
128 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
129 us-gaap: Comprehensive income attributable to AGL Resources Inc. (net of tax) xbrli:stringItemType duration us-gaap:ComprehensiveIncomeNetOfTaxAbstract
130 us-gaap: Net income attributable to AGL Resources Inc. xbrli:monetaryItemType duration credit us-gaap:NetIncomeLoss
131 us-gaap: Derivative financial instruments unrealized (losses) gains arising during the period xbrli:monetaryItemType duration credit us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
132 us-gaap: Reclassification of derivative financial instruments realized losses (gains) included in net income xbrli:monetaryItemType duration debit us-gaap:OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax
133 us-gaap: Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease
134 us-gaap: Other comprehensive income (loss) xbrli:monetaryItemType duration credit us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
135 us-gaap: Comprehensive income (Note 1) xbrli:monetaryItemType duration credit us-gaap:ComprehensiveIncomeNetOfTax
136 us-gaap: Comprehensive income (loss) attributable to noncontrolling interest (net of tax) xbrli:stringItemType duration us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterestAbstract
137 us-gaap: Net income (loss) attributable to noncontrolling interest xbrli:monetaryItemType duration debit us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
138 agl: Derivative financial instruments unrealized (losses) gains arising during the period xbrli:monetaryItemType duration agl:OtherComprehensiveIncomeUnrealizedGainsLossesOnDerivativesArisingDuringPeriodNetOfTaxAttributableToNoncontrollingInterest
139 agl: Reclassification of derivative financial instruments realized losses (gains) included in net income xbrli:monetaryItemType duration agl:OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTaxNoncontrollingInterest
140 us-gaap: Other comprehensive income (loss) xbrli:monetaryItemType duration debit us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
141 us-gaap: Comprehensive income (loss) (Note 1) xbrli:monetaryItemType duration debit us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
142 us-gaap: Total comprehensive income (net of tax) xbrli:stringItemType duration us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract
143 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
144 agl: Derivative financial instruments unrealized (losses) gains arising during the period xbrli:monetaryItemType duration credit agl:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodIncludingPortionAttributableToNoncontrollingInterestNetOfTax
145 agl: Reclassification of derivative financial instruments realized losses (gains) included in net income xbrli:monetaryItemType duration credit agl:OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeIncludingPortionAttributableToNoncontrollingInterestNetOfTax
146 us-gaap: Other comprehensive income (loss) xbrli:monetaryItemType duration us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease
147 us-gaap: Comprehensive income (Note 1) xbrli:monetaryItemType duration credit us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
* Network: (500 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS)
148 us-gaap: Statement of Cash Flows [Abstract] xbrli:stringItemType duration us-gaap:StatementOfCashFlowsAbstract
149 us-gaap: Statement [Table] xbrli:stringItemType duration us-gaap:StatementTable
150 us-gaap: Statement [Line Items] xbrli:stringItemType duration us-gaap:StatementLineItems
151 us-gaap: Cash flows from operating activities xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract
152 us-gaap: Net income xbrli:monetaryItemType duration credit us-gaap:ProfitLoss
153 us-gaap: Depreciation and amortization xbrli:monetaryItemType duration debit us-gaap:DepreciationAndAmortization
154 us-gaap: Deferred income taxes xbrli:monetaryItemType duration debit us-gaap:DeferredIncomeTaxExpenseBenefit
155 us-gaap: Change in derivative financial instrument assets and liabilities xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInRiskManagementAssetsAndLiabilities
156 us-gaap: Gas, unbilled and other receivables xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInReceivables
157 us-gaap: Energy marketing receivables and energy marketing trade payables, net xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInCommodityContractAssetsAndLiabilities
158 us-gaap: Inventories xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInInventories
159 us-gaap: Gas and trade payables xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccountsPayableTrade
160 us-gaap: Accrued expenses xbrli:monetaryItemType duration debit us-gaap:IncreaseDecreaseInAccruedLiabilities
161 us-gaap: Other - net xbrli:monetaryItemType duration credit us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet
162 us-gaap: Net cash flow provided by operating activities xbrli:monetaryItemType duration us-gaap:NetCashProvidedByUsedInOperatingActivities
163 us-gaap: Cash flows from investing activities xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract
164 us-gaap: Payments to acquire, property, plant and equipment xbrli:monetaryItemType duration credit us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
165 us-gaap: Payments for (Proceeds from) Other Investing Activities xbrli:monetaryItemType duration credit us-gaap:PaymentsForProceedsFromOtherInvestingActivities
166 us-gaap: Net cash flow used in investing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInInvestingActivities
167 us-gaap: Cash flows from financing activities xbrli:stringItemType duration us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract
168 us-gaap: Repayments of Other Debt xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfOtherDebt
169 us-gaap: Repayments of Medium-term Notes xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfMediumTermNotes
170 us-gaap: Payments for Repurchase of Common Stock xbrli:monetaryItemType duration credit us-gaap:PaymentsForRepurchaseOfCommonStock
171 us-gaap: Issuance of senior notes xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOfSeniorLongTermDebt
172 us-gaap: Net payments and borrowings of short-term debt xbrli:monetaryItemType duration debit us-gaap:ProceedsFromRepaymentsOfShortTermDebt
173 us-gaap: Dividends paid on common shares xbrli:monetaryItemType duration credit us-gaap:PaymentsOfDividendsCommonStock
174 us-gaap: Distribution to noncontrolling interest xbrli:monetaryItemType duration debit us-gaap:ProceedsFromPaymentsToMinorityShareholders
175 us-gaap: Payments of long-term debt xbrli:monetaryItemType duration credit us-gaap:RepaymentsOfLongTermDebt
176 us-gaap: Issuance of variable rate gas facility revenue bonds xbrli:monetaryItemType duration debit us-gaap:ProceedsFromIssuanceOfOtherLongTermDebt
177 us-gaap: Issuance of treasury shares and other xbrli:monetaryItemType duration debit us-gaap:ProceedsFromSaleOfTreasuryStock
178 us-gaap: Other xbrli:monetaryItemType duration debit us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
179 us-gaap: Net cash flow (used in) provided by financing activities xbrli:monetaryItemType duration debit us-gaap:NetCashProvidedByUsedInFinancingActivities
180 us-gaap: Net increase (decrease) in cash and cash equivalents xbrli:monetaryItemType duration us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease
181 us-gaap: Cash and cash equivalents at beginning of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
182 us-gaap: Cash and Cash equivalents at end of period xbrli:monetaryItemType instant debit us-gaap:CashAndCashEquivalentsAtCarryingValue
183 agl: Cash paid during the period for xbrli:stringItemType duration agl:CashPaidDuringPeriodForAbstract
184 agl: Interest xbrli:monetaryItemType duration agl:Interest
185 agl: Income taxes xbrli:monetaryItemType duration agl:IncomeTaxes
* Network: (600 - Disclosure - Accounting Policies and Methods of Application)
186 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
187 us-gaap: Accounting Policies and Methods of Application us-types:textBlockItemType duration us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock
* Network: (601 - Disclosure - Fair Value Measurements)
188 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
189 us-gaap: Fair Value Measurements us-types:textBlockItemType duration us-gaap:FairValueDisclosuresTextBlock
* Network: (602 - Disclosure - Derivative Financial Instruments)
190 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
191 us-gaap: Derivative Financial Instruments us-types:textBlockItemType duration us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock
* Network: (603 - Disclosure - Employee Benefit Plans)
192 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
193 us-gaap: Employee Benefit Plans us-types:textBlockItemType duration us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock
* Network: (604 - Disclosure - Variable Interest Entity)
194 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
195 us-gaap: Variable Interest Entity us-types:textBlockItemType duration us-gaap:MinorityInterestDisclosureTextBlock
* Network: (605 - Disclosure - Equity)
196 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
197 us-gaap: Equity us-types:textBlockItemType duration us-gaap:StockholdersEquityNoteDisclosureTextBlock
* Network: (606 - Disclosure - Debt)
198 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
199 us-gaap: Debt us-types:textBlockItemType duration us-gaap:DebtDisclosureTextBlock
* Network: (607 - Disclosure - Commitments and Contingencies)
200 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
201 us-gaap: Commitments and Contingencies us-types:textBlockItemType duration us-gaap:CommitmentsAndContingenciesDisclosureTextBlock
* Network: (608 - Disclosure - Segment Information)
202 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
203 us-gaap: Segment Information us-types:textBlockItemType duration us-gaap:SegmentReportingDisclosureTextBlock
* Network: (609 - Disclosure - Subsequent Item)
204 agl: Notes To Financial Statements [Abstract] xbrli:stringItemType duration agl:NotesToFinancialStatementsAbstract
205 us-gaap: Subsequent Item us-types:textBlockItemType duration us-gaap:ScheduleOfSubsequentEventsTextBlock
* Network: (995200 - Document - Document Information)
206 dei: Document Information Text Block us-types:textBlockItemType duration dei:DocumentInformationTextBlock
207 dei: Document Name xbrli:normalizedStringItemType duration dei:DocumentName
208 dei: Document Type us-types:SECReportItemType duration dei:DocumentType
209 dei: Document Period End Date xbrli:dateItemType duration dei:DocumentPeriodEndDate
210 dei: Amendment Description xbrli:stringItemType duration dei:AmendmentDescription
211 dei: Amendment Flag xbrli:booleanItemType duration dei:AmendmentFlag
* Network: (995400 - Document - Entity Information)
212 dei: Entity Text Block us-types:textBlockItemType duration dei:EntityTextBlock
213 dei: Entity Registrant Name xbrli:normalizedStringItemType duration dei:EntityRegistrantName
214 dei: Entity Central Index Key us-types:centralIndexKeyItemType duration dei:EntityCentralIndexKey
215 dei: Current Fiscal Year End Date xbrli:gMonthDayItemType duration dei:CurrentFiscalYearEndDate
216 dei: Entity Well Known Seasoned Issuer us-types:yesNoItemType duration dei:EntityWellKnownSeasonedIssuer
217 dei: Entity Voluntary Filers us-types:yesNoItemType duration dei:EntityVoluntaryFilers
218 dei: Entity Current Reporting Status us-types:yesNoItemType duration dei:EntityCurrentReportingStatus
219 dei: Entity Filer Category us-types:filerCategoryItemType duration dei:EntityFilerCategory
220 dei: Entity Public Float xbrli:monetaryItemType instant credit dei:EntityPublicFloat
221 dei: Entity Common Stock Shares Outstanding xbrli:sharesItemType instant dei:EntityCommonStockSharesOutstanding