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Leases (Lease Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
2019	$ 18
2020	61
2021	46
2022	34
2023	26
2024	20
Thereafter	59
Total lease payments	264
Less: Imputed interest	(21)
Total	$ 243	$ 265
Operating Leases
2019			$ 76
2020			61
2021			43
2022			33
2023			22
Thereafter			64
Total lease payments			$ 299