Leases - Cash flow (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating cash flows from operating leases
Operating cash flows from operating leases	$ 87
Financing cash flows from finance leases	40
Right-of-use assets obtained in exchange for operating lease obligations	149
Right-of-use assets obtained in exchange for financing leases obligations	$ 134