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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

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