Other Financial Information - Schedule of Other Noncurrent Liabilities and Deferred Credits (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Financial Information [Abstract]
Noncurrent accrued tax liability	$ 174	$ 174
Accrued compensation and retirement costs	95	120
Operating lease obligations	59	64
Deferred energy credits	37	54
Value added tax credits payable to Arconic Corporation	51	47
Noncurrent restructuring reserve	3	43
Deferred alumina sales revenue	28	36
Noncurrent site separation reserve		26
Other	39	35
Other noncurrent liabilities and deferred credits, total	$ 486	$ 599