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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2021
Asset Retirement Obligation [Abstract] |
Summary Of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
| (In Millions)
| March 31, 2021 |  | December 31, 2020
Asset retirement obligations 1 | $ | 310 |  |  | $ | 342 |
Less: current portion | 12 |  |  | 7 |
Long-term asset retirement obligations | $ | 298 |  |  | $ | 335 |
1 Includes $158 million and $190 million related to our active operations as of March 31, 2021 and December 31, 2020, respectively.
Schedule of Change in Asset Retirement Obligation | The following is a roll forward of our asset retirement obligation liability:
| (In Millions)
| 2021 |  | 2020
Asset retirement obligation as of January 1 | $ | 342 |  |  | $ | 165 |
Increase (decrease) from Acquisitions | (34) |  |  | 14 |
Accretion expense | 3 |  |  | 2 |
Remediation payments | (1) |  |  | — |
Asset retirement obligation as of March 31 | $ | 310 |  |  | $ | 181 |

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