ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2023

Asset Retirement Obligation [Abstract]

Summary of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

(In millions)	September 30, 2023		December 31, 2022
Asset retirement obligations1	$	522	$	520
Less: current portion	17		21
Long-term asset retirement obligations	$	505	$	499
1 Includes $275 million and $277 million related to our active operations as of September 30, 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	19		21
Reclassification from environmental obligations	—		63
Revision in estimated cash flows	—		22
Remediation payments	(17)		(33)
Asset retirement obligation as of September 30	$	522	$	522