Table: Pension and Other Postretirement Benefits Disclosure [Table]

Line Label Object Class Period Type Balance Name
1 Pension and Other Postretirement Benefits Disclosure [Table] [Table]

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 added:PensionOtherPostretirementBenefitsDisclosureTable
2 Legal Entity [Axis] [Axis]

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 dei:LegalEntityAxis
3 Consolidated Entity [Domain] [Domain]

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 dei:EntityDomain
4 General Discussion of Pension and Other Postretirement Benefits [Hierarchy] [Abstract]

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 added:PensionOtherPostretirementBenefitsDisclosureLineItems
5 Pension and Other Postretirement Benefits Disclosure [Text Block] [Concept] Text Block (HTML) For Period

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 us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock
6 Compensation and Employee Benefit Plans [Text Block] [Concept] Text Block (HTML) For Period

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 us-gaap:CompensationAndEmployeeBenefitPlansTextBlock
7 General Discussion of Pension and Other Postretirement Benefits [Hierarchy] [Abstract]

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 us-gaap:GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract
8 General Discussion of Pension and Other Postretirement Benefits [Concept] Text/String For Period

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 us-gaap:GeneralDiscussionOfPensionAndOtherPostretirementBenefits
9 Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Hierarchy] [Abstract]

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 us-gaap:DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract
10 Defined Benefit Plans, General Information [Concept] Text/String For Period

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 us-gaap:DefinedBenefitPlansGeneralInformation
11 Defined Contribution Pension and Other Postretirement Plans Disclosure [Hierarchy] [Abstract]

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 us-gaap:DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
12 Description of Defined Contribution Pension and Other Postretirement Plans [Concept] Text/String For Period

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 us-gaap:DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans
13 Defined Contribution Plan, Cost Recognized [Concept] Monetary For Period Debit us-gaap:DefinedContributionPlanCostRecognized
14 Description of Nature and Effect of Significant Changes During Period Affecting Comparability [Concept] Text/String For Period

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 us-gaap:DescriptionOfNatureAndEffectOfSignificantChangesDuringPeriodAffectingComparability
15 Multiemployer Plans [Hierarchy] [Abstract]

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 us-gaap:MultiemployerPlansAbstract
16 Description of Multiemployer Plan [Concept] Text/String For Period

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 us-gaap:DescriptionOfMultiemployerPlan
17 Multiemployer Plan, Period Contributions [Concept] Monetary For Period Debit us-gaap:MultiemployerPlanPeriodContributions
18 Multiemployer Plan, Withdrawal Obligation [Concept] Monetary As Of Credit us-gaap:MultiemployerPlanWithdrawalObligation
19 Multiemployer Plan, Significant Changes Impacting Comparability [Concept] Text/String For Period

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 us-gaap:MultiemployerPlanSignificantChangesImpactingComparability
20 Postretirement Medical Plans with Prescription Drug Benefits [Hierarchy] [Abstract]

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 us-gaap:PostretirementMedicalPlansWithPrescriptionDrugBenefitsAbstract
21 Description of Postretirement Medical Plans with Prescription Drug Benefits [Concept] Text/String For Period

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 us-gaap:DescriptionOfPostretirementMedicalPlansWithPrescriptionDrugBenefits
22 Prescription Drug Benefit Subsidy, Effect Not Determined [Concept] Yes/No For Period

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 us-gaap:PrescriptionDrugBenefitSubsidyEffectNotDetermined
23 Prescription Drug Benefit, Reduction in Accumulated Postretirement Benefit Obligation for Subsidy [Concept] Monetary As Of Debit us-gaap:PrescriptionDrugBenefitReductionInAccumulatedPostretirementBenefitObligationForSubsidy
24 Prescription Drug Benefit, Effect of Subsidy on Net Periodic Postretirement Benefit Cost [Concept] Monetary As Of Debit us-gaap:PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost
25 Postretirement Medical Plans with Prescription Drug Benefits, Description of Other Significant Change [Concept] Text/String For Period

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 us-gaap:PostretirementMedicalPlansWithPrescriptionDrugBenefitsDescriptionOfOtherSignificantChange
26 Disclosure of Expected Gross Prescription Drug Subsidy Receipts [Hierarchy] [Abstract]

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 us-gaap:DisclosureOfExpectedGrossPrescriptionDrugSubsidyReceiptsAbstract
27 Prescription Drug Subsidy Receipts, Year One [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsYearOne
28 Prescription Drug Subsidy Receipts, Year Two [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsYearTwo
29 Prescription Drug Subsidy Receipts, Year Three [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsYearThree
30 Prescription Drug Subsidy Receipts, Year Four [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsYearFour
31 Prescription Drug Subsidy Receipts, Year Five [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsYearFive
32 Prescription Drug Subsidy Receipts, Five Fiscal Years Thereafter [Concept] Monetary As Of Credit us-gaap:PrescriptionDrugSubsidyReceiptsFiveFiscalYearsThereafter
33 Japanese Welfare Pension Insurance Law [Hierarchy] [Abstract]

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 us-gaap:JapaneseWelfarePensionInsuranceLawAbstract
34 Japanese Welfare Pension Insurance Law, General Description [Concept] Text/String For Period

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 us-gaap:JapaneseWelfarePensionInsuranceLawGeneralDescription
35 Japanese Welfare Pension Insurance Law, Government Subsidies [Concept] Monetary As Of Debit us-gaap:JapaneseWelfarePensionInsuranceLawGovernmentSubsidies
36 Japanese Welfare Pension Insurance Law, Previously Accrued Salary Progression Derecognition [Concept] Monetary As Of Debit us-gaap:JapaneseWelfarePensionInsuranceLawPreviouslyAccruedSalaryProgressionDerecognition
37 Application of Recognition Provisions of FAS 158, Incremental Effects on Balance Sheet [Hierarchy] [Abstract]

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 us-gaap:ApplicationOfRecognitionProvisionsOfSFAS158IncrementalEffectsOnBalanceSheetAbstract
38 Description of Change in Accounting Principle, FAS 158 [Concept] Text/String For Period

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 us-gaap:DescriptionOfChangeInAccountingPrincipleSFAS158
39 Other Comprehensive Income (Loss), Minimum Pension Liability Net Adjustment, Net of Tax [Concept] Monetary For Period Debit us-gaap:OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax
40 Change in Measurement Date, FAS 158 [Hierarchy] [Abstract]

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 us-gaap:ChangeInMeasurementDateSFAS158Abstract
41 Description of Change in Measurement Date, FAS 158 [Concept] Text/String For Period

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 us-gaap:DescriptionOfChangeInMeasurementDateSFAS158
42 Effect on Retained Earnings (Accumulated Deficit) Due to Change in Measurement Date, Net of Tax [Roll Up] [Abstract]

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 us-gaap:EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateNetOfTaxAbstract
43 Effect on Retained Earnings (Accumulated Deficit) Due to Change in Measurement Date, before Tax [Concept] Monetary For Period Debit us-gaap:EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateBeforeTax
44 Effect on Retained Earnings (Accumulated Deficit) Due to Change in Measurement Date, Tax [Concept] Monetary For Period Credit us-gaap:EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateTax
45 Effect on Retained Earnings (Accumulated Deficit) Due to Change in Measurement Date, Net of Tax, Total [Concept] Monetary For Period Debit us-gaap:EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateNetOfTax
46 Effect on Accumulated Other Comprehensive Income (Loss) Due to Change in Measurement Date, Net of Tax [Roll Up] [Abstract]

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 us-gaap:EffectOnAccumulatedOtherComprehensiveIncomeLossDueToChangeInMeasurementDateNetOfTaxAbstract
47 Effect on Accumulated Other Comprehensive Income (Loss) Due to Change in Measurement Date, before Tax [Concept] Monetary As Of Credit us-gaap:EffectOnAccumulatedOtherComprehensiveIncomeLossDueToChangeInMeasurementDateBeforeTax
48 Effect on Accumulated Other Comprehensive Income (Loss) Due to Change in Measurement Date, Tax [Concept] Monetary As Of Debit us-gaap:EffectOnAccumulatedOtherComprehensiveIncomeLossDueToChangeInMeasurementDateTax
49 Effect on Accumulated Other Comprehensive Income (Loss) Due to Change in Measurement Date, Net of Tax, Total [Concept] Monetary As Of Credit us-gaap:EffectOnAccumulatedOtherComprehensiveIncomeLossDueToChangeInMeasurementDateNetOfTax
50 Deferred Compensation Arrangements [Hierarchy] [Abstract]

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 us-gaap:DeferredCompensationArrangementsAbstract
51 Deferred Compensation Arrangements, Overall, Description [Concept] Text/String For Period

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 us-gaap:DeferredCompensationArrangementsOverallDescription
52 Coal Industry Retiree Health Benefit Act of 1992 [Hierarchy] [Abstract]

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 us-gaap:CoalIndustryRetireeHealthBenefitActOf1992Abstract
53 Coal Industry Retiree Health Benefit Act of 1992, Impact of Act [Concept] Text/String For Period

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 us-gaap:CoalIndustryRetireeHealthBenefitActOf1992ImpactOfAct
54 Coal Industry Retiree Health Benefit Act of 1992, Estimated Amount of Total Obligation [Concept] Monetary As Of Credit us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation
55 Coal Industry Retiree Health Benefit Act of 1992, Method of Accounting Adopted [Concept] Text/String For Period

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 us-gaap:CoalIndustryRetireeHealthBenefitActOf1992MethodOfAccountingAdopted