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Asset Retirement Obligations (Tables) | 12 Months Ended
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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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