Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Changes to Asset Retirement Obligations

The following table describes the changes in our asset retirement obligations for the years ended December 31:

	2023		2022
	(In millions)
Balance at January 1	$	1,241	$	1,190
Liabilities incurred	135		126
Liabilities settled or disposed of (a)	(240)		(213)
Accretion expense	61		48
Revisions of estimated liabilities	148		92
Foreign currency remeasurement	1		(2)
Balance at December 31	$	1,346	$	1,241
Total Asset Retirement Obligations at December 31:
Current portion of asset retirement obligations	$	160	$	207
Long-term asset retirement obligations	1,186		1,034
Total at December 31	$	1,346	$	1,241