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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) |  |  |  |  |

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