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Leases Operating Lease Right-Of-Use Assets (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]  
2019 $ 19
2020 20
2021 18
2022 17
2023 17
2024 16
Thereafter 165
Total Minimum Future Lease Receipts $ 272