Leases - Schedule Of Supplemental Cash Flow Related To Leases (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 47	$ 42
Financing cash flows from finance leases	1	1
Right of use assets obtained in exchange for lease liabilities:
Operating leases	7	27
Finance leases	$ 0	$ 7