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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022, 2021 and 2020 (in millions):
| December 31,
| 2022 |  | 2021 |  | 2020
Beginning balance | $ | 143 |  |  | $ | 135 |  |  | $ | 137 |
Liabilities incurred | 2 |  |  | 2 |  |  | 12 |
Liabilities settled (1) | (26) |  |  | (1) |  |  | (1) |
Accretion expense | 4 |  |  | 4 |  |  | 5 |
Revisions in estimated cash flows | (1) |  |  | 3 |  |  | (18) |
Ending balance | $ | 122 |  |  | $ | 143 |  |  | $ | 135 |
(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 Notes 7 and 19 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 -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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