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Derivative and Financial Instruments - FX Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative assets | $ 1 | $ 7
Other accruals [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | 20 | 6
Other liabilities and deferred credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | $ 8 | $ 0

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