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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2020
Environmental Remediation Obligations [Abstract] |
Schedule of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
| (In Millions)
| December 31,
| 2020 |  | 2019
Asset retirement obligations 1 | $ | 342 |  |  | $ | 165 |
Less: current portion | 7 |  |  | 2 |
Long-term asset retirement obligations | $ | 335 |  |  | $ | 163 |
1 Includes $190 million and $22 million related to our active operations as of December 31, 2020 and 2019, respectively.
Asset Retirement Obligations | The following is a roll-forward of our asset retirement obligation liability:
| (In Millions) |
| 2020 |  | 2019 |
Asset retirement obligation as of January 1 | $ | 165 |  |  | $ | 172 |  |
Increase from acquisitions | 172 |  |  | — |  |
Accretion expense | 14 |  |  | 10 |  |
Remediation payments | (9) |  |  | (1) |  |
Revision in estimated cash flows | — |  |  | (16) |  |
Asset retirement obligation as of December 31 | $ | 342 |  |  | $ | 165 |  |

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