Leases (Maturities of Lease Liabilities) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Leases
2019	$ 55
2020	92
2021	76
2022	65
2023	57
After 2023	391
Gross Total	736
Imputed Discount	(223)
Total	513
Finance Leases
2019	9
2020	16
2021	16
2022	17
2023	134
After 2023	53
Gross Total	245
Imputed Discount	(48)
Total	$ 197