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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024, 2023 and 2022 (in millions):
December 31,
202420232022
Beginning balance$126 $122 $143 
Liabilities incurred3 2 2 
Liabilities settled (1)
(2)(1)(26)
Accretion expense4 4 4 
Revisions in estimated cash flows(1)(1)(1)
Ending balance$130 $126 $122 
(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.