Leases - Other Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Lease cost	$ 171	$ 355
Short-term lease costs	70	156
Variable lease costs	29	60
Cash flow from operating activities		95
Cash flow from investing activities		44
Cost of sales
Lessee, Lease, Description [Line Items]
Lease cost	61	138
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Lease cost	19	35
Property, plant and equipment, net
Lessee, Lease, Description [Line Items]
Lease cost	$ 91	$ 182