Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) Project	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Environmental remediation reserve balance, current	$ 48	$ 48		$ 44
Liabilities incurred	18	23	$ 8	21
Payments against the reserve	7	17		23
Reversals of previously recorded liabilities		3	17	17
Active or future remediation for significant sites	267	267		247
Accrued environmental reserves	310	$ 310		309	$ 322
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
Other Sites [Member]
Loss Contingencies [Line Items]
Number of remediation projects | Project		35
Accrued environmental reserves	43	$ 43		$ 63
Magnesium Smelter Facility in Addy [Member]
Loss Contingencies [Line Items]
Liabilities incurred	14	14
Former East St. Louis Site [Member]
Loss Contingencies [Line Items]
Liabilities incurred		5
Environmental activiteis
Loss Contingencies [Line Items]
Liabilities incurred	$ 4	$ 4
Closed Site in Brazil [Member]
Loss Contingencies [Line Items]
Reversals of previously recorded liabilities			5
Closed Tennessee Site [Member]
Loss Contingencies [Line Items]
Reversals of previously recorded liabilities			7
Closed Suriname Site [Member]
Loss Contingencies [Line Items]
Reversals of previously recorded liabilities			$ 5