ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2022

Asset Retirement Obligation [Abstract]

Summary Of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

	(In Millions)
	March 31, 2022		December 31, 2021
Asset retirement obligations1	$	460	$	449
Less: current portion	33		35
Long-term asset retirement obligations	$	427	$	414
1 Includes $297 million and $293 million related to our active operations as of March 31, 2022 and December 31, 2021, respectively.

Schedule of Change in Asset Retirement Obligation

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

	(In Millions)
	2022		2021
Asset retirement obligation as of January 1	$	449	$	342
Decrease from acquisitions	—		(34)
Accretion expense	7		3
Revision in estimated cash flows	7		—
Remediation payments	(3)		(1)
Asset retirement obligation as of March 31	$	460	$	310