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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2021
Asset Retirement Obligation [Abstract] |
Summary Of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
| (In Millions)
| June 30, 2021 |  | December 31, 2020
Asset retirement obligations 1 | $ | 397 |  |  | $ | 342 |
Less: current portion | 31 |  |  | 7 |
Long-term asset retirement obligations | $ | 366 |  |  | $ | 335 |
1 Includes $243 million and $190 million related to our active operations as of June 30, 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 from Acquisitions | 57 |  |  | 14 |
Accretion expense | 8 |  |  | 5 |
Remediation payments | (10) |  |  | (1) |
Asset retirement obligation as of June 30 | $ | 397 |  |  | $ | 183 |

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