Supplier Finance Programs	3 Months Ended
Mar. 31, 2023
Supplier Financing [Abstract]
Supplier Finance Programs	R. Supplier Finance Programs As of March 31, 2023, the Company has various supplier finance programs with third-party financial institutions that are made available to suppliers to facilitate payment term negotiations. Under the terms of these agreements, suppliers may elect to participate to receive payment in advance of the payment date from third-party financial institutions for qualifying invoices. Alcoa’s obligations to its suppliers, including amounts due and payment terms, are not impacted by its suppliers’ participation in these programs. The Company does not pledge any assets as security or provide any guarantees beyond payment of outstanding invoices at maturity under these arrangements. The Company does not pay fees to the financial institutions under these arrangements. At March 31, 2023 and December 31, 2022, qualifying supplier invoices outstanding under these programs were $131 and $185, respectively, and have payment terms ranging from 50 to 110 days. These obligations are included in Accounts payable, trade on the accompanying Consolidated Balance Sheet.

Supplier Finance Programs

3 Months Ended

Mar. 31, 2023

R. Supplier Finance Programs

As of March 31, 2023, the Company has various supplier finance programs with third-party financial institutions that are made available to suppliers to facilitate payment term negotiations. Under the terms of these agreements, suppliers may elect to participate to receive payment in advance of the payment date from third-party financial institutions for qualifying invoices. Alcoa’s obligations to its suppliers, including amounts due and payment terms, are not impacted by its suppliers’ participation in these programs. The Company does not pledge any assets as security or provide any guarantees beyond payment of outstanding invoices at maturity under these arrangements. The Company does not pay fees to the financial institutions under these arrangements. At March 31, 2023 and December 31, 2022, qualifying supplier invoices outstanding under these programs were $131 and $185, respectively, and have payment terms ranging from 50 to 110 days. These obligations are included in Accounts payable, trade on the accompanying Consolidated Balance Sheet.