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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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Liability as of the balance sheet date of outstanding checks that were reclassified from cash and cash equivalents to accounts payable and accrued liabilities.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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-Topic 410
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-Section 50
-Paragraph 1
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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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-Publisher FASB
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