Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 45	$ 32	$ 20
Estimated amortization expense in 2020	61
Estimated amortization expense in 2021	38
Estimated amortization expense in 2022	37
Estimated amortization expense in 2023	36
Estimated amortization expense in 2024	$ 34