Lease Commitments - Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 85	$ 91
Amortization of ROU assets	4	0
Interest on lease liabilities	3	0
Lease, Cost	256	184
Short-term lease cost	54	86
Variable lease cost	38	31
Operating cash flows	145	48
Investing cash flows	36	19
Financing cash flows	9	0
Cost of sales
Lessee, Lease, Description [Line Items]
Operating lease costs	143	77
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 21	$ 16