Fair Value (Quantitative Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Fair Value Inputs Quantitative Information [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ (24)	$ 5	$ (4)
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value	(24)
Foreign Exchange Contract [Member]
Fair Value Inputs Quantitative Information [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	277	209	93
Interest Rate Contract
Fair Value Inputs Quantitative Information [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ (304)	(210)	(101)
Interest Rate Contract | Minimum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	2.88%
Interest Rate Contract | Maximum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	8.88%
Interest Rate Contract | Weighted Average
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	5.42%
Commodity Contract [Member]
Fair Value Inputs Quantitative Information [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ 3	$ 6	$ 4
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Minimum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	8.88%
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Maximum
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	8.88%
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Weighted Average
Fair Value Inputs Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk	8.88%
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	$ 291
Argentina, Pesos | Foreign Exchange Contract [Member] | Minimum
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]
Argentine Peso to U.S. Dollar currency exchange rate after 1 year	0.1751
Argentina, Pesos | Foreign Exchange Contract [Member] | Maximum
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]
Argentine Peso to U.S. Dollar currency exchange rate after 1 year	0.3544
Argentina, Pesos | Foreign Exchange Contract [Member] | Weighted Average
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract]
Argentine Peso to U.S. Dollar currency exchange rate after 1 year	0.2605
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	$ (14)