Divestitures	3 Months Ended
Mar. 31, 2021
Business Combinations [Abstract]
Divestitures	C. Divestitures Gum Springs Waste Treatment Business During the first quarter of 2020, the Company sold Elemental Environmental Solutions LLC (EES), a wholly-owned Alcoa subsidiary that operated the waste processing facility in Gum Springs, Arkansas, to a global environmental firm in a transaction valued at $250. During 2020, the Company received $200 in cash and recorded a total gain of $181 (pre- and after-tax; see Note Q). Further, an additional $50 is held in escrow to be paid to Alcoa if certain post-closing conditions are satisfied, which would result in an additional gain being recorded. Warrick Rolling Mill On November 30, 2020, Alcoa entered into an agreement to sell 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). At December 31, 2020, the Company had assets and liabilities held for sale of $648 and $242, respectively, related to the transaction. On March 31, 2021, Alcoa completed the sale for total consideration of approximately $670, which includes the assumption of $72 in other postretirement benefit liabilities (subject to further post-closing adjustments). Additionally, as of March 31, 2021, the Company incurred transaction costs of $7. The Company recorded a gain of $27 in Other income, net (pre- and after-tax) on the Statement of Consolidated Operations in the first quarter of 2021 (see Note Q). The consideration and gain amounts are subject to customary post-closing adjustments. Further, the Company recorded estimated liabilities of approximately $70 in the first quarter of 2021 for future site separation commitments and remaining transaction costs associated with the sale agreement. Alcoa entered into a market-based metal supply agreement with Kaiser in connection with the transaction. Alcoa also entered into a ground lease agreement with Kaiser 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, 2021

C. Divestitures

Gum Springs Waste Treatment Business

During the first quarter of 2020, the Company sold Elemental Environmental Solutions LLC (EES), a wholly-owned Alcoa subsidiary that operated the waste processing facility in Gum Springs, Arkansas, to a global environmental firm in a transaction valued at $250. During 2020, the Company received $200 in cash and recorded a total gain of $181 (pre- and after-tax; see Note Q). Further, an additional $50 is held in escrow to be paid to Alcoa if certain post-closing conditions are satisfied, which would result in an additional gain being recorded.

Warrick Rolling Mill

On November 30, 2020, Alcoa entered into an agreement to sell 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). At December 31, 2020, the Company had assets and liabilities held for sale of $648 and $242, respectively, related to the transaction.

On March 31, 2021, Alcoa completed the sale for total consideration of approximately $670, which includes the assumption of $72 in other postretirement benefit liabilities (subject to further post-closing adjustments). Additionally, as of March 31, 2021, the Company incurred transaction costs of $7. The Company recorded a gain of $27 in Other income, net (pre- and after-tax) on the Statement of Consolidated Operations in the first quarter of 2021 (see Note Q). The consideration and gain amounts are subject to customary post-closing adjustments. Further, the Company recorded estimated liabilities of approximately $70 in the first quarter of 2021 for future site separation commitments and remaining transaction costs associated with the sale agreement.

Alcoa entered into a market-based metal supply agreement with Kaiser in connection with the transaction. Alcoa also entered into a ground lease agreement with Kaiser 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.