Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Project	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Environmental remediation reserve balance, current	$ 37		$ 37		$ 29
Liabilities incurred	4	$ 4	8	$ 6	7
Payments related to remediation expenses applied against the reserve	3	$ 5	14	14	19
Reversals of previously recorded liabilities			17
Decrease in reserves due to effects of foreign currency translation				$ 6
Active or future remediation for significant sites	241		241		259
Accrued environmental reserves	297		$ 297		322	$ 335
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
Sherwin, Texas [Member]
Loss Contingencies [Line Items]
Beginning of expected term for reuse of residue bed			8 years
Ending of expected term for reuse of residue bed			10 years
Other Sites [Member]
Loss Contingencies [Line Items]
Number of remediation projects | Project			35
Accrued environmental reserves	$ 56		$ 56		$ 63
Closed Suriname Site [Member]
Loss Contingencies [Line Items]
Reversals of previously recorded liabilities			5
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