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ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation [Abstract]

Changes to the asset retirement obligations

The following table summarizes the changes to the ARO balances during 2020 and 2019:

ARO Reconciliation						(In millions)
Balance, January 1, 2019						$	812
Liabilities settled						(2)
Accretion						46
Balance, December 31, 2019 (1)						$	856
Liabilities settled (2)						(744)
Accretion						47
Balance, December 31, 2020						$	159

(1) Includes $691 million related to TMI-2 classified as held for sale for the year ended December 31, 2019.

(2) 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. See Note 15, "Commitments, Guarantees and Contingencies," for further information.

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