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ASSET RETIREMENT OBLIGATIONS (Notes) | 3 Months Ended
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Mar. 31, 2021
Asset Retirement Obligation [Abstract] |
ASSET RETIREMENT OBLIGATIONS | NOTE 12 - 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.
The accrued closure obligation provides for contractual and legal obligations related to our indefinitely idled and closed operations and for the eventual closure of our active operations. The closure date for each of our active mine sites was determined based on the exhaustion date of the remaining mineral reserves and the amortization of the related asset and accretion of the liability is recognized over the estimated mine lives. The closure date and expected timing of the capital requirements to meet our obligations for our indefinitely idled or closed mines is determined based on the unique circumstances of each property. For indefinitely idled or closed mines, the accretion of the liability is recognized over the anticipated timing of remediation. As the majority of our asset retirement obligations at our steelmaking operations have indeterminate settlement dates, asset retirement obligations have been recorded at present values using estimated ranges of the economic lives of the underlying assets. 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 |
The decrease from Acquisitions for the three months ended March 31, 2021, relates to measurement period adjustments as a result of the preliminary purchase price allocation of the AM USA Transaction.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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