ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2023

Asset Retirement Obligation [Abstract]

Summary Of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

(In millions)	March 31, 2023		December 31, 2022
Asset retirement obligations1	$	524	$	520
Less: current portion	24		21
Long-term asset retirement obligations	$	500	$	499
1 Includes $279 million and $277 million related to our active operations as of March 31, 2023 and December 31, 2022, respectively.

Schedule of Change in Asset Retirement Obligation

The following is a roll forward of our asset retirement obligation liability:

(In millions)	2023		2022
Asset retirement obligation as of January 1	$	520	$	449
Accretion expense	8		7
Revision in estimated cash flows	—		7
Remediation payments	(4)		(3)
Asset retirement obligation as of March 31	$	524	$	460