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Fair Value (Quantitative Information) (Details) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 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 | $ 99 | $ 93 | $ 50 | $ 81
Interest Rate Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ (129) | (151) | (183) | (179)
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 | 4.40% |  |  |
Interest Rate Contract [Member] | Weighted Average [Member] |  |  |  |
Fair Value Inputs [Abstract] |  |  |  |
Fair Value Inputs, Entity Credit Risk | 3.50% |  |  |
Foreign Exchange Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 225 | 240 | 231 | 255
Commodity Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 3 | $ 4 | $ 2 | $ 5
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 | $ 225 |  |  |
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 | 24.3 |  |  |
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 | 56.3 |  |  |
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 | 38.8 |  |  |

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