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Long Term Debt (Debt Maturities By Year) (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Long Term Debt [Abstract]  
Principal Payments 2019 (remaining nine months) $ 13
Principal Payments 2020 245
Principal Payments 2021 327
Principal Payments 2022 2,706
Principal Payments 2023 868
Thereafter $ 12,621