Subsequent Events	9 Months Ended
Sep. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	R. Subsequent Events On October 16, 2024, the Board of Directors declared a quarterly cash dividend of $0.10 per share of the Company’s common stock (including common stock underlying CDIs) and Series A convertible preferred stock, to be paid on November 15, 2024 to stockholders of record as of the close of business on October 29, 2024. Dividends on Alcoa’s common and preferred stock are paid in U.S. dollars. Dividends on common stock underlying CDIs paid in a currency other than the U.S. dollar will be determined using foreign currency exchange rates as of November 11, 2024. On October 16, 2024, Alcoa announced that it is progressing toward entering into a strategic cooperation agreement with IGNIS Equity Holdings, SL (IGNIS EQT), the majority shareholder in the IGNIS Group of Companies, a vertically integrated energy company based in Spain, to support the continued operation of the San Ciprián complex. Under the proposed agreement, Alcoa would maintain a majority ownership share of the San Ciprián complex, including continuing as the managing operator, with IGNIS EQT holding 25 percent. The proposed agreement is conditional upon delivery of key areas of cooperation with San Ciprián’s stakeholders.

Subsequent Events

9 Months Ended

Sep. 30, 2024

R. Subsequent Events

On October 16, 2024, the Board of Directors declared a quarterly cash dividend of $0.10 per share of the Company’s common stock (including common stock underlying CDIs) and Series A convertible preferred stock, to be paid on November 15, 2024 to stockholders of record as of the close of business on October 29, 2024. Dividends on Alcoa’s common and preferred stock are paid in U.S. dollars. Dividends on common stock underlying CDIs paid in a currency other than the U.S. dollar will be determined using foreign currency exchange rates as of November 11, 2024.

On October 16, 2024, Alcoa announced that it is progressing toward entering into a strategic cooperation agreement with IGNIS Equity Holdings, SL (IGNIS EQT), the majority shareholder in the IGNIS Group of Companies, a vertically integrated energy company based in Spain, to support the continued operation of the San Ciprián complex. Under the proposed agreement, Alcoa would maintain a majority ownership share of the San Ciprián complex, including continuing as the managing operator, with IGNIS EQT holding 25 percent. The proposed agreement is conditional upon delivery of key areas of cooperation with San Ciprián’s stakeholders.