Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 58	$ 39	$ 41
Changes due to the Combination		14
Changes due to exchange rate fluctuations		(1)	1
Increases based on tax positions taken in the current year	4	2	1
Increases based on tax positions taken in prior years	5	9	4
Decreases based on tax positions taken in prior years	(9)	(5)	(2)
Decreases due to settlements			(6)
Decreases due to lapse of applicable statute of limitation	(2)
Balance at end of period	$ 56	$ 58	$ 39