Leasing - Schedule of Lease Expense and Operating Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Costs from operating leases	$ 20	$ 20	$ 38	$ 39
Variable lease payments	$ 1	5	5	8
Short-term rental expense		$ 1	$ 1	$ 4