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Leases (Maturities of Lease Liabilities) (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Operating Leases  
2019 $ 69
2020 86
2021 70
2022 62
2023 55
After 2023 352
Gross Total 694
Imputed Discount (219)
Total 475
Finance Leases  
2019 10
2020 13
2021 13
2022 14
2023 131
After 2023 52
Gross Total 233
Imputed Discount (54)
Total $ 179