Investments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2022	Dec. 31, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Apr. 30, 2022
Alcoa Corporation [Member]
Schedule Of Equity Method Investments [Line Items]
Charges recorded				$ 62,000,000
Alcoa Corporation [Member] | Other Nonoperating Income Expense [Member]
Schedule Of Equity Method Investments [Line Items]
Charges recorded		$ 21,000,000		41,000,000
Mineracao Rio do Norte S.A [Member] | Brazil [Member]
Schedule Of Equity Method Investments [Line Items]
Asset impairment charges			$ 58,000,000
Proceeds from Sale of Long-term Investments	$ 10,000,000
Additional cash to be received upon satisfying post closing conditions						$ 30,000,000
ELYSIS TM Limited Partnership [Member]
Schedule Of Equity Method Investments [Line Items]
Basis in investment, due to share of losses				0	$ 0
Unrecognized losses				$ (63,000,000)