Leases - Cash flow (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Operating cash flows from operating leases
Operating cash flows from operating leases	$ 66
Financing cash flows from finance leases	27
Right-of-use assets obtained in exchange for operating lease obligations	146
Right-of-use assets obtained in exchange for financing leases obligations	$ 114