Leases - Operating Leases Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 26	$ 26
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 9	$ 9
Weighted-average remaining lease term (years)	6 years 8 months 12 days	7 years 3 months 18 days
Weighted-average discount rate applied to operating leases (percent)	3.60%	3.60%