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Fair Value (Quantitative Information) (Details) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 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 | $ (139) | $ (126) | $ (24) | $ 48 | $ (108) | $ 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 | $ (421) | (416) | (304) | (191) | (302) | (210)
Interest Rate Contract [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |  |
Fair Value Inputs, Entity Credit Risk | 2.90% |  |  |  |  |
Interest Rate Contract [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |  |
Fair Value Inputs, Entity Credit Risk | 11.20% |  |  |  |  |
Interest Rate Contract [Member] | Weighted Average [Member] |  |  |  |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |  |
Fair Value Inputs, Entity Credit Risk | 4.40% |  |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 271 | $ 290 | $ 277 | 222 | 223 | $ 209
Cross currency derivatives [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  |  | $ 0 | $ (33) |
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 | $ 271 |  |  |  |  |
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 | 18.6 |  |  |  |  |
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 | 35.2 |  |  |  |  |
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 | 26.8 |  |  |  |  |
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 | $ 11 |  |  |  |  |

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