Investments - Additional Information (Detail) - USD ($)		3 Months Ended
	Feb. 15, 2022	Mar. 31, 2022
ELYSIS TM Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Basis in investment, due to share of losses		$ 0
Unrecognized losses		52,000,000
Brazil [Member] | Mineração Rio do Norte S.A [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Long-term Investments	$ 10,000,000
Asset impairment charges		$ 58,000,000
Additional cash to be received upon satisfying post closing conditions	$ 30,000,000
Alcoa Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture		25.10%
Maaden Alcoa Joint Venture [Member] | Ma'aden [Member] | SAUDI ARABIA
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture		74.90%