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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents

The following table presents a reconciliation of cash and cash equivalents and restricted cash reported on our Consolidated Balance Sheet that sum to the total of the amount shown on our Consolidated Statement of Cash Flows as of December 31, 2019 (in millions):

			December 31, 2019
Cash and cash equivalents			$	45
Restricted cash			37
Total cash and cash equivalents and restricted cash			$	82

Schedule of Change in Asset Retirement Obligation

The following table presents the change in the liability for asset retirement obligations, of which $135 million, $107 million and $99 million were reflected in “Other long-term liabilities and deferred credits” with the remaining portion reflected in “Other current liabilities” on our Consolidated Balance Sheets as of December 31, 2019, 2018 and 2017, respectively (in millions):

			December 31,
			2019						2018						2017
Beginning balance			$	109					$	103					$	44
Liabilities incurred			3						3						33
Liabilities settled			(3)						(3)						(4)
Accretion expense			5						4						3
Revisions in estimated cash flows			23						2						27
Ending balance			$	137					$	109					$	103

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Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

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