Schedule of Intangible Assets Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 65	$ 59	$ 65
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	37	28	36
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	23	25	24
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 5	$ 6	$ 5