Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Project	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Liabilities incurred	$ 4		$ 18	$ 5	$ 32
Payments against the reserve	16	$ 6	23	10	26
Reversals of previously recorded liabilities			1	$ 2	30
Environmental remediation reserve balance, current	63		63		58
Active or future remediation for significant sites	222		222		234
Accrued environmental reserves	278		278		284	$ 309
Ongoing Remediation Work [Member]
Loss Contingencies [Line Items]
Liabilities incurred	4
Intalco Aluminum Smelter [Member]
Loss Contingencies [Line Items]
Liabilities incurred			$ 14
Massena, New York [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			4 years
Massena, New York [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			8 years
Addy, Washington [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			3 years
Addy, Washington [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			5 years
Ferndale, Washington [Member]
Loss Contingencies [Line Items]
Post-closure maintenance and monitoring period			5 years
Environmental remediation work completion period			3 years
Other Sites [Member]
Loss Contingencies [Line Items]
Number of remediation projects at other sites | Project			32
Accrued environmental reserves	$ 56		$ 56		$ 50