Leases - Other information associated with leases (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 145
Operating cash flows from finance leases	16
Financing cash flows from finance leases	20
Right-of-use assets obtained in exchange for new finance lease obligations	5
Right-of-use assets obtained in exchange for new operating lease obligations	$ 106