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Derivative and Financial Instruments - FX Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative assets | $ 16 | $ 1
Other Accruals [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | 0 | 20
Other liabilities and deferred credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | $ 0 | $ 8

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