Subsequent Events	12 Months Ended
Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	V. Subsequent Events On February 23, 2023, the Board of Directors declared a quarterly cash dividend of $0.10 per share of the Company’s common stock, to be paid on March 23, 2023 to stockholders of record as of the close of business on March 7, 2023. On February 3, 2023, the Company reached an updated agreement with the workers’ representatives to commence the restart process of the San Ciprián (Spain) aluminum smelter in phases beginning in January 2024. Alcoa plans that all pots will be restarted by October 1, 2025, and from October 1, 2025 until the end of 2026, the minimum production will be 75 percent of the annual capacity of 228 kmt. Under the terms of the updated agreement, the Company is responsible for certain employee obligations during the extended curtailment period. As a result, the Company will record charges of approximately $50 (pre- and after-tax) in the first quarter of 2023 in Restructuring and other charges, net on the Statement of Consolidated Operations. Cash outlays related to these obligations are expected in 2024 and 2025. In connection with the updated agreement, the Company made additional commitments of $78 for capital improvements at the site to be spent primarily between 2024 and 2025. In January 2023, the Company reduced production at the Kwinana (Australia) refinery by approximately 30 percent in response to a domestic natural gas shortage in Western Australia due to production challenges experienced by key gas suppliers. Beginning in January 2023, the financial information provided to the chief operating decision maker (CODM) for the activities of the bauxite mines and the alumina refineries was combined, and accordingly the Company changed its operating segments. Beginning with the first quarter of 2023, the Company will report its financial results in the following two segments: (i) Alumina, and (ii) Aluminum. Segment information for all prior periods presented will be updated to reflect the new segment structure.

Subsequent Events

12 Months Ended

Dec. 31, 2022

V. Subsequent Events

On February 23, 2023, the Board of Directors declared a quarterly cash dividend of $0.10 per share of the Company’s common stock, to be paid on March 23, 2023 to stockholders of record as of the close of business on March 7, 2023.

On February 3, 2023, the Company reached an updated agreement with the workers’ representatives to commence the restart process of the San Ciprián (Spain) aluminum smelter in phases beginning in January 2024. Alcoa plans that all pots will be restarted by October 1, 2025, and from October 1, 2025 until the end of 2026, the minimum production will be 75 percent of the annual capacity of 228 kmt. Under the terms of the updated agreement, the Company is responsible for certain employee obligations during the extended curtailment period. As a result, the Company will record charges of approximately $50 (pre- and after-tax) in the first quarter of 2023 in Restructuring and other charges, net on the Statement of Consolidated Operations. Cash outlays related to these obligations are expected in 2024 and 2025. In connection with the updated agreement, the Company made additional commitments of $78 for capital improvements at the site to be spent primarily between 2024 and 2025.

In January 2023, the Company reduced production at the Kwinana (Australia) refinery by approximately 30 percent in response to a domestic natural gas shortage in Western Australia due to production challenges experienced by key gas suppliers.

Beginning in January 2023, the financial information provided to the chief operating decision maker (CODM) for the activities of the bauxite mines and the alumina refineries was combined, and accordingly the Company changed its operating segments. Beginning with the first quarter of 2023, the Company will report its financial results in the following two segments: (i) Alumina, and (ii) Aluminum. Segment information for all prior periods presented will be updated to reflect the new segment structure.