Leases (Maturities of Lease Liabilities) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 98
2021	81
2022	72
2023	64
2024	52
After 2024	388
Gross Total	755
Imputed Discount	(243)
Total	512
Financing Leases
2020	19
2021	19
2022	21
2023	145
2024	21
After 2024	168
Gross Total	393
Imputed Discount	(113)
Total	$ 280