Asset Retirement Obligations	9 Months Ended
Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	P. Asset Retirement Obligations During the third quarter and nine-month period of 2023, the Company recorded liabilities of $4 (both periods) as a result of updated estimates related to spent pot lining treatment and disposal at a previously closed site and $36 (nine-month period only) related to the closure of the previously curtailed Intalco aluminum smelter. Further, the Company recorded a reversal of a reserve of $2 (both periods) due to the completion of the demolition project at the previously closed Lake Charles anode facility in Louisiana. These amounts were recorded in Restructuring and other charges, net (see Note D) on the accompanying Statement of Consolidated Operations. 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. The facility has been fully curtailed since 2001. The additional accrual was recorded in Restructuring and other charges, net (see Note D) 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 non-operating bauxite residue areas at the Poços de Caldas 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 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, 2023

Asset Retirement Obligation Disclosure [Abstract]

P. Asset Retirement Obligations

During the third quarter and nine-month period of 2023, the Company recorded liabilities of $4 (both periods) as a result of updated estimates related to spent pot lining treatment and disposal at a previously closed site and $36 (nine-month period only) related to the closure of the previously curtailed Intalco aluminum smelter. Further, the Company recorded a reversal of a reserve of $2 (both periods) due to the completion of the demolition project at the previously closed Lake Charles anode facility in Louisiana. These amounts were recorded in Restructuring and other charges, net (see Note D) on the accompanying Statement of Consolidated Operations.

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. The facility has been fully curtailed since 2001. The additional accrual was recorded in Restructuring and other charges, net (see Note D) 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 non-operating bauxite residue areas at the Poços de Caldas 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 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.