Leases (Other Information) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 151
Operating cash flows from finance leases	5
Financing cash flows from finance leases	35
Leased assets obtained in exchange for new operating lease liabilities	147
Leased assets obtained in exchange for new finance lease liabilities	$ 36