Leases Lease Liabilities Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020	$ 55	$ 61
2021	50	53
2022	42	40
2023	35	33
2024	24	26
Thereafter	63	65
Total lease payments	269
Less: Interest	(26)
Total	$ 243	$ 278
Operating lease, weighted-average remaining lease term	6 years 1 month 6 days
Operating lease, weighted-average discount rate, percent	3.00%
Finance Lease, Liability, Payment, Due [Abstract]
2020	$ 14
2021	10
2022	10
2023	10
2024	10
Thereafter	9
Total lease payments	63
Less: Interest	(6)
Total	$ 57
Finance lease, weighted-average remaining lease term	5 years 9 months 18 days
Finance lease, weighted-average discount rate, percent	3.40%