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Fair Value (Quantitative Information) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (43) $ 48 $ 5 $ (73) $ (60) $ (4)
Interest Rate Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (283) (191) (210) (180) (183) (101)
Interest Rate Contract [Member] | Minimum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 4.44%          
Interest Rate Contract [Member] | Maximum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 8.47%          
Interest Rate Contract [Member] | Weighted Average [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 5.77%          
Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 231 222 209 95 107 93
Cross currency derivatives [Member] | Minimum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk          
Cross currency derivatives [Member] | Maximum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk          
Cross currency derivatives [Member] | Weighted Average [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk          
Commodity Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 9 $ 17 $ 6 $ 12 $ 16 $ 4
Argentina, Pesos | Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 230          
Argentina, Pesos | Foreign Exchange Contract [Member] | Minimum [Member]            
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]            
Argentine Peso to U.S. Dollar currency exchange rate after 1 year 15.03          
Argentina, Pesos | Foreign Exchange Contract [Member] | Maximum [Member]            
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]            
Argentine Peso to U.S. Dollar currency exchange rate after 1 year 38.25          
Argentina, Pesos | Foreign Exchange Contract [Member] | Weighted Average [Member]            
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]            
Argentine Peso to U.S. Dollar currency exchange rate after 1 year 25.85          
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Minimum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Counterparty Credit Risk 5.66%          
Fair Value Inputs, Entity Credit Risk 8.47%          
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Maximum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Counterparty Credit Risk 5.66%          
Fair Value Inputs, Entity Credit Risk 8.47%          
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Weighted Average [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Counterparty Credit Risk 5.66%          
Fair Value Inputs, Entity Credit Risk 8.47%          
Derivative Financial Instruments, Assets [Member] | Euro Member Countries, Euro | Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 15          
Derivative Financial Instruments, Liabilities [Member] | Euro Member Countries, Euro | Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (14)