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ASSET RETIREMENT OBLIGATIONS | 6 Months Ended
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Jun. 30, 2022
Asset Retirement Obligation [Abstract] |
ASSET RETIREMENT OBLIGATIONS | NOTE 12 - ASSET RETIREMENT OBLIGATIONS The following is a summary of our asset retirement obligations:
| (In Millions)
| June 30, 2022 |  | December 31, 2021
Asset retirement obligations 1 | $ | 532 |  |  | $ | 449 |
Less: current portion | 30 |  |  | 35 |
Long-term asset retirement obligations | $ | 502 |  |  | $ | 414 |
1 Includes $290 million and $293 million related to our active operations as of June 30, 2022 and December 31, 2021, 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)
| 2022 |  | 2021
Asset retirement obligation as of January 1 | $ | 449 |  |  | $ | 342 |
Increase from acquisitions | — |  |  | 57 |
Accretion expense | 15 |  |  | 8 |
Reclassification from environmental obligations | 63 |  |  | — |
Revision in estimated cash flows | 21 |  |  | — |
Remediation payments | (16) |  |  | (10) |
Asset retirement obligation as of June 30 | $ | 532 |  |  | $ | 397 |
The increase from revision in estimated cash flows primarily relates to rising electricity costs associated with required water management systems related to closed coal mines in Pennsylvania.

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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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