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Fair Value (Quantitative Information) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 93 | $ 81 | $ (24)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | 93 |  |
Foreign Exchange Contract [Member] |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 240 | 255 | 277
Interest Rate Contract |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ (151) | (179) | (304)
Interest Rate Contract | Minimum |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Entity Credit Risk | 1.90% |  |
Interest Rate Contract | Maximum |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Entity Credit Risk | 5.10% |  |
Interest Rate Contract | Weighted Average |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Entity Credit Risk | 4.90% |  |
Commodity Contract [Member] |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 4 | $ 5 | $ 3
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 | $ 240 |  |
Argentina, Pesos | Foreign Exchange Contract [Member] | Minimum |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Derivative, Forward Exchange Rate | 0.228 |  |
Argentina, Pesos | Foreign Exchange Contract [Member] | Maximum |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Derivative, Forward Exchange Rate | 0.523 |  |
Argentina, Pesos | Foreign Exchange Contract [Member] | Weighted Average |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |
Derivative, Forward Exchange Rate | 0.366 |  |

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