ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2024

Asset Retirement Obligation [Abstract]

Summary of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

(In millions)	September 30, 2024		December 31, 2023
Asset retirement obligations1	$	501	$	459
Less: current portion	42		15
Long-term asset retirement obligations	$	459	$	444
1 Includes $269 million and $259 million related to our active operations as of September 30, 2024 and December 31, 2023, respectively.

Schedule of Change in Asset Retirement Obligation

The following is a roll-forward of our asset retirement obligations:

(In millions)	2024		2023
Asset retirement obligations as of January 1	$	459	$	520
Accretion expense	17		19
Revision in estimated cash flows	49		—
Remediation payments	(24)		(17)
Asset retirement obligations as of September 30	$	501	$	522