Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 57	$ 59	$ 117	$ 119
Short-term lease cost	12	18	25	30
Variable lease cost	7	2	15	10
Total lease cost	76	79	157	159
Cost of Sales [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	17	19	36	38
Marketing Administration And Research Costs [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	$ 59	$ 60	$ 121	$ 121