Leases Schedule of Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		$ 15
2020		20
2021		13
2022		26
2023		9
2024 and thereafter		1
Total lease payments		84
Less: Amount representing interest		18
Present value of lease liabilities		66
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Total lease payments	$ 148
Operating Lease, Liability	111
Operating Leases [Abstract]
2019		33
2020		24
2021		20
2022		13
2023		10
2024 and thereafter		61
Total minimum payments		$ 161
Finance Lease, Liability, Payment, Due [Abstract]
Total lease payments	9
Finance Lease, Liability	$ 8