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Divestitures	3 Months Ended
Mar. 31, 2022
Business Combinations [Abstract]
Divestitures	C. Divestitures Warrick Rolling Mill On March 31, 2021, Alcoa completed the sale of its rolling mill located at Warrick Operations (Warrick Rolling Mill), an integrated aluminum manufacturing site near Evansville, Indiana (Warrick Operations), to Kaiser Aluminum Corporation (Kaiser) for total consideration of approximately $670, which included the assumption of $69 in other postretirement benefit liabilities. The Company recorded a net gain of $30 in Other income, net (pre- and after-tax, see Note P) on the Statement of Consolidated Operations, $27 of which was recorded in the first quarter of 2021. Upon the closing of the transaction, the Company recorded estimated liabilities for future site separation commitments and remaining transaction costs associated with the sales agreement. At December 31, 2021, the remaining reserve was approximately $70. Over half of the expected cash outlay is to be spent in 2022, with the remainder to be spent through 2023. In the first quarter of 2022, the Company spent $2 against the reserve. In connection with the transaction, Alcoa and Kaiser entered into a market-based metal supply agreement and a ground lease agreement for the Warrick Rolling Mill property, which Alcoa continues to own. Approximately 1,150 employees at Warrick Rolling Mill, which includes the casthouse, hot mill, cold mills, and coating and slitting lines, became employees of Kaiser as a result of the transaction. Alcoa continues to own and operate the site’s 269,000 metric ton per year aluminum smelter and the power plant, which together employ approximately 670 people. The remaining Warrick Operations site results are included within the Aluminum segment.

Divestitures

3 Months Ended

Mar. 31, 2022

C. Divestitures

Warrick Rolling Mill

On March 31, 2021, Alcoa completed the sale of its rolling mill located at Warrick Operations (Warrick Rolling Mill), an integrated aluminum manufacturing site near Evansville, Indiana (Warrick Operations), to Kaiser Aluminum Corporation (Kaiser) for total consideration of approximately $670, which included the assumption of $69 in other postretirement benefit liabilities. The Company recorded a net gain of $30 in Other income, net (pre- and after-tax, see Note P) on the Statement of Consolidated Operations, $27 of which was recorded in the first quarter of 2021. Upon the closing of the transaction, the Company recorded estimated liabilities for future site separation commitments and remaining transaction costs associated with the sales agreement. At December 31, 2021, the remaining reserve was approximately $70. Over half of the expected cash outlay is to be spent in 2022, with the remainder to be spent through 2023. In the first quarter of 2022, the Company spent $2 against the reserve.

In connection with the transaction, Alcoa and Kaiser entered into a market-based metal supply agreement and a ground lease agreement for the Warrick Rolling Mill property, which Alcoa continues to own. Approximately 1,150 employees at Warrick Rolling Mill, which includes the casthouse, hot mill, cold mills, and coating and slitting lines, became employees of Kaiser as a result of the transaction. Alcoa continues to own and operate the site’s 269,000 metric ton per year aluminum smelter and the power plant, which together employ approximately 670 people. The remaining Warrick Operations site results are included within the Aluminum segment.