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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligation [Abstract]

Changes to the asset retirement obligations

The following table summarizes the changes to the ARO balances during 2019 and 2018:

ARO Reconciliation						(In millions)
Balance, January 1, 2018						$	570
Changes in timing and amount of estimated cash flows						203
Liabilities settled						(1)
Accretion						40
Balance, December 31, 2018						$	812
Liabilities settled						(2)
Accretion						46
Balance, December 31, 2019 (1)						$	856

(1) Includes $691 million related to TMI-2 classified as held for sale. See Note 15, "Commitments,

Guarantees and Contingencies," for further information.

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