Asset Retirement Obligations	9 Months Ended
Sep. 30, 2022
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	O. Asset Retirement Obligations Alcoa records AROs related to legal obligations associated with the standard operation of bauxite mines, alumina refineries, and aluminum smelters. These AROs consist primarily of costs associated with mine reclamation, closure of bauxite residue areas, spent pot lining disposal, and landfill closures. The Company also recognizes AROs for the disposal of regulated waste materials related to the demolition of facilities and for any significant lease restoration obligations, if required by a lease agreement. The Company recorded a liability of $15 in the third quarter of 2022 related to the closure of the previously curtailed magnesium smelter in Addy (Washington). The facility has been fully curtailed since 2001. The additional accrual was recorded in Restructuring and other charges, net on the Statement of Consolidated Operations. The Company recorded a liability of $47 in the second quarter of 2022 when an initial estimate became available for improvements required on both operating and closed bauxite residue areas at the Poços de Caldas (Brazil) refinery to comply with updated impoundment regulations in the region. The additional accruals were recorded with a charge to Cost of goods sold of $39 and a corresponding capitalized asset retirement cost of $8 in the second quarter of 2022. In the third quarter of 2022, the Company updated its initial estimate and recorded an additional liability of $9. The additional accruals were recorded with a charge to Cost of goods sold of $8 and a corresponding capitalized asset retirement cost of $1.

Asset Retirement Obligations

9 Months Ended

Sep. 30, 2022

Asset Retirement Obligation Disclosure [Abstract]

O. Asset Retirement Obligations

Alcoa records AROs related to legal obligations associated with the standard operation of bauxite mines, alumina refineries, and aluminum smelters. These AROs consist primarily of costs associated with mine reclamation, closure of bauxite residue areas, spent pot lining disposal, and landfill closures. The Company also recognizes AROs for the disposal of regulated waste materials related to the demolition of facilities and for any significant lease restoration obligations, if required by a lease agreement.

The Company recorded a liability of $15 in the third quarter of 2022 related to the closure of the previously curtailed magnesium smelter in Addy (Washington). The facility has been fully curtailed since 2001. The additional accrual was recorded in Restructuring and other charges, net on the Statement of Consolidated Operations.

The Company recorded a liability of $47 in the second quarter of 2022 when an initial estimate became available for improvements required on both operating and closed bauxite residue areas at the Poços de Caldas (Brazil) refinery to comply with updated impoundment regulations in the region. The additional accruals were recorded with a charge to Cost of goods sold of $39 and a corresponding capitalized asset retirement cost of $8 in the second quarter of 2022. In the third quarter of 2022, the Company updated its initial estimate and recorded an additional liability of $9. The additional accruals were recorded with a charge to Cost of goods sold of $8 and a corresponding capitalized asset retirement cost of $1.