Leases - Schedule of Components of Lease Expense (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 57
Finance lease cost:
Interest on lease liabilities	0
Amortization of right-of-use assets	1
Total finance lease cost	1
Total lease cost	58
Variable lease costs	4
Cost of sales, exclusive of depreciation and amortization
Lessee, Lease, Description [Line Items]
Total operating lease cost	9
Selling, general and administrative
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 48