Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value Measurements Rollforward (Details)

v2.4.1.9
Employee Benefit Plans - Fair Value Measurements Rollforward (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in fair value of plan assets      
Fair value, December 31 $ 24,133us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 23,525us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
U.S. government and government agency securities      
Change in fair value of plan assets      
Fair value, December 31 4,166us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Non-U.S. debt securities      
Change in fair value of plan assets      
Fair value, December 31 1,114us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Private real estate      
Change in fair value of plan assets      
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Real estate commingled/mutual funds      
Change in fair value of plan assets      
Fair value, December 31 636us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Limited partnerships      
Change in fair value of plan assets      
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Other investments      
Change in fair value of plan assets      
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Level 3      
Change in fair value of plan assets      
Fair value, January 1 879us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 3 | U.S. government and government agency securities      
Change in fair value of plan assets      
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Level 3 | Non-U.S. debt securities      
Change in fair value of plan assets      
Fair value, January 1 6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 3 | Private real estate      
Change in fair value of plan assets      
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Change in fair value of plan assets      
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