Summary of Significant Accounting Policies (Tables)

12 Months Ended

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.