Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Effective income tax rate	30.90%	33.50%	29.50%	104.40%
Increase/(decrease) in effective tax rate due to impact of discrete tax items	(5.70%)	9.90%	(1.00%)	187.50%
Net increase to income tax reserves for unrecognized tax benefits based on tax positions related to current and prior years			$ 8
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	$ 54		54
Current Tax Payable Within Other Current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	9		9
Non-Current Tax Payable Within Other Non-current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	$ 45		$ 45