v2.4.1.9
Fair Values for Plans by Asset Category (Detail) (Pension, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category $ 18,548us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 17,111us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 18,282us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Cash and Cash Equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,983us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 4,339us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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US Treasuries and agencies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,257us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Corporate Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 2,882us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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International Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 582us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Other Fixed Income Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Real Estate
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,792us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Private Equity
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 3,748us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Hedge Funds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,962us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 5,899us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1 | Cash and Cash Equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,814us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1 | Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 2,952us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1 | US Treasuries and agencies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 830us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1 | Corporate Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 264us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 1 | International Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 39us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 6,274us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | Cash and Cash Equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 169us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,277us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | US Treasuries and agencies
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 427us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | Corporate Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 2,506us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | International Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 524us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2 | Other Fixed Income Securities
      
Defined Benefit Plan Disclosure [Line Items]      
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Level 2 | Private Equity
      
Defined Benefit Plan Disclosure [Line Items]      
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Level 2 | Hedge Funds
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 1,164us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair values for the pension plans by asset category 6,375us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 3 | Equity Securities
      
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Level 3 | Corporate Bonds
      
Defined Benefit Plan Disclosure [Line Items]      
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Level 3 | International Bonds
      
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Level 3 | Real Estate
      
Defined Benefit Plan Disclosure [Line Items]      
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Level 3 | Private Equity
      
Defined Benefit Plan Disclosure [Line Items]      
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Level 3 | Hedge Funds
      
Defined Benefit Plan Disclosure [Line Items]      
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/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member