ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2021

Asset Retirement Obligation [Abstract]

Summary Of Asset Retirement Obligations

The following is a summary of our asset retirement obligations:

	(In Millions)
	June 30, 2021		December 31, 2020
Asset retirement obligations1	$	397	$	342
Less: current portion	31		7
Long-term asset retirement obligations	$	366	$	335
1 Includes $243 million and $190 million related to our active operations as of June 30, 2021 and December 31, 2020, respectively.

Schedule of Change in Asset Retirement Obligation

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	57		14
Accretion expense	8		5
Remediation payments	(10)		(1)
Asset retirement obligation as of June 30	$	397	$	183