Leases - Cash flow (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Operating cash flows from operating leases
Operating cash flows from operating leases	$ 44
Financing cash flows from finance leases	17
Right-of-use assets obtained in exchange for operating lease obligations	32
Right-of-use assets obtained in exchange for financing leases obligations	$ 110