ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation [Abstract]

Changes to the asset retirement obligations

The following table summarizes the changes to the ARO balances during 2021 and 2020:

ARO Reconciliation	(In millions)
Balance, January 1, 2020	$	856
Liabilities settled (1)	(744)
Accretion	47
Balance, December 31, 2020	$	159
Changes in timing and amount of estimated cash flows	8
Liabilities settled	(1)
Accretion	13
Balance, December 31, 2021	$	179

(1) Includes $726 million related to the closing of the asset purchase and sale agreement with TMI-2 Solutions, LLC, a subsidiary of EnergySolutions, LLC, concerning the transfer and dismantlement of TMI-2.