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Borrowings (Post Swap Borrowing Tables) (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Borrowings    
Fixed-rate debt $ 27,255us-gaap_LongtermDebtPercentageBearingFixedInterestAmount $ 30,123us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Floating-rate debt 12,420us-gaap_LongtermDebtPercentageBearingVariableInterestAmount [1] 6,587us-gaap_LongtermDebtPercentageBearingVariableInterestAmount [1]
Long-Term Debt, including current portion 39,675us-gaap_LongTermDebt 36,710us-gaap_LongTermDebt
Fixed-rate debt, Average Rate (as a percent) 3.09%us-gaap_LongTermDebtPercentageBearingFixedInterestRate 3.07%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Floating-rate debt, Average Rate (as a percent) 0.82%us-gaap_LongTermDebtPercentageBearingVariableInterestRate 0.87%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Interest rate swaps | Derivative instruments in fair value hedging relationships    
Derivative    
Notional amount $ 5,839invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember		 $ 3,106invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
[1]

Includes $5,839 million in 2014 and $3,106 million in 2013 of notional interest rate swaps that effectively convert fixed-rate long-term debt into floating-rate debt. (See note D, “Financial Instruments,” on pages 105 through 109).