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Derivative and Financial Instruments - FX Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities | In December 2017, we entered into foreign exchange zero cost collars buying the right to sell $1.25 billion CAD at $0.707 CAD and selling the right to buy $1.25 billion CAD at $0.842 CAD against the U.S. dollar. |
Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative assets | $ 18 | $ 1
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative assets | 0 | 6
Other Accruals [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | 7 | 0
Other liabilities and deferred credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange derivative liabilities | $ 0 | $ 15

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