Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Accounts Payable, Other, Current	$ 232	$ 418	$ 472
Other Liabilities, Noncurrent	731	757
Depreciation and amortization expense	218	204	191
Amortization expense relating to capitalized computer software	113	$ 109	92
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Accounts Payable, Other, Current	10		$ 15
Other Liabilities, Noncurrent	$ 3