Leases (Operating and Finance Lease Liability Maturity Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Leases
2020	$ 53
2021	42
2022	30
2023	22
2024	18
Thereafter	100
Total lease payments	265
Less imputed interest	(58)
Total	207
Finance Leases
2020	3
2021	2
2022	2
2023	2
2024	2
Thereafter	4
Total lease payments	15
Less imputed interest	(2)
Total	$ 13
Operating Leases
2019		$ 54
2020		42
2021		34
2022		26
2023		21
Thereafter		117
Total lease payments		294
Finance Leases
2019		5
2020		5
2021		5
2022		4
2023		4
Thereafter		6
Total lease payments		$ 29