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Fair Value (Quantitative Information) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 53 $ 50 $ 81 $ (139) $ (126) $ (24)
Interest Rate Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (195) (183) (179) (421) (416) (304)
Interest Rate Contract [Member] | Minimum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 2.40%          
Interest Rate Contract [Member] | Maximum [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 5.10%          
Interest Rate Contract [Member] | Weighted Average [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 4.80%          
Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 239 231 255 271 290 277
Commodity Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 9 $ 2 $ 5 $ 11 $ 0 $ 3
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 $ 239          
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 19.7          
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 43.1          
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 30.9