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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table presents the change in the liability for asset retirement obligations, substantially all of which is reflected in “Other long-term liabilities and deferred credits” on our Consolidated Balance Sheets as of December 31, 2023, 2022 and 2021 (in millions):
| December 31,
| 2023 |  | 2022 |  | 2021
Beginning balance | $ | 122 |  |  | $ | 143 |  |  | $ | 135 |
Liabilities incurred | 2 |  |  | 2 |  |  | 2 |
Liabilities settled (1) | (1) |  |  | (26) |  |  | (1) |
Accretion expense | 4 |  |  | 4 |  |  | 4 |
Revisions in estimated cash flows | (1) |  |  | (1) |  |  | 3 |
Ending balance | $ | 126 |  |  | $ | 122 |  |  | $ | 143 |
(1)The 2022 amount primarily relates to the transfer of liabilities to the third party purchaser associated with the sale of Line 901 and the Sisquoc to Pentland portion of Line 903 pipeline. See Note 7 and Note 18 for additional information.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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