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Fair Value (Quantitative Information) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (24) $ (139) $ (24) $ (43) $ 48 $ 5
Interest Rate Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (307) (421) (304) (283) (191) (210)
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 31.50%          
Interest Rate Contract [Member] | Weighted Average [Member]            
Fair Value Inputs [Abstract]            
Fair Value Inputs, Entity Credit Risk 4.30%          
Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 274 $ 271 $ 277 $ 231 $ 222 $ 209
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 $ 274          
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 17.5          
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 32.7          
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 25.4          
Other unspecified currency [Domain] | Foreign Exchange Contract [Member]            
Fair Value Inputs Quantitative Information [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 9