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Summary of Significant Accounting Policies - Various Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Foreign Currency Transactions/Translation |  |  |  |
Gain (loss) on revaluation of foreign currency transactions and monetary assets and liabilities | $ 1 | $ 1 | $ 21 |
Cash and Cash Equivalents and Restricted Cash |  |  |  |
Outstanding checks included in accounts payable that were reclassified from cash and cash equivalents | 38 | 57 |  |
Asset Retirement Obligations |  |  |  |
Fair value of asset retirement obligations | 137 | 109 | 103 | $ 44
Other long-term liabilities and deferred credits |  |  |  |
Asset Retirement Obligations |  |  |  |
Fair value of asset retirement obligations | $ 135 | $ 107 | $ 99 |

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