Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 60	$ 60
Short-term lease cost	13	12
Variable lease cost	8	8
Total lease cost	81	80
Cost of Sales [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	19	19
Marketing Administration And Research Costs [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	$ 62	$ 61