ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2021

Environmental Remediation Obligations [Abstract]

Schedule of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

	(In Millions)
	December 31,
	2021		2020
Asset retirement obligations1	$	449	$	342
Less: current portion	35		7
Long-term asset retirement obligations	$	414	$	335
1 Includes $293 million and $190 million related to our active operations as of December 31, 2021 and 2020, respectively.

Roll-forward of Asset Retirement Obligation Liability

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

	(In Millions)
	2021		2020
Asset retirement obligation as of January 1	$	342	$	165
Increase from acquisitions	116		172
Accretion expense	18		14
Remediation payments	(29)		(9)
Revision in estimated cash flows	2		—
Asset retirement obligation as of December 31	$	449	$	342