Reconciliation of U.S Federal Income Tax Statutory Rate and Effective Income Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 3	$ 4	$ 3
Changes in valuation allowances	0.00%	(26.90%)	6.30%
U.S. federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal tax benefits	4.80%	(1.70%)	5.50%
Taxes on foreign operations at rates different than statutory U.S. federal rates	3.10%	3.40%	(5.20%)
Effective Income Tax Rate Reconciliation, Stock-based Compensation, Percent	(0.10%)	0.00%	(0.80%)
Effective Income Tax Rate Reconciliation, 2017 Tax Reform Act Impact, Percent, Total	0.00%	0.00%	11.20%
Other non-deductible expenses	(0.40%)	(1.40%)	1.10%
Other	0.00%	0.40%	(0.90%)
Effective Income Tax Rate, Continuing Operations, Total	28.40%	(5.20%)	38.20%