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Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | $ 64 | $ 987
Derivative Assets | 253 | 170
Derivative liabilities | 78 | 354
Recurring fair value measurements | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 64 | 987
Derivative Assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring fair value measurements | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 253 | 170
Derivative liabilities | 78 | 354
Recurring fair value measurements | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 0 | 0
Derivative liabilities | $ 0 | $ 0

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