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Operating Leases - (Maturities of Operating Leases) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2019 remaining period $ 58
2020 111
2021 88
2022 60
2023 45
Thereafter 108
Total lease payments 470
Less: Imputed interest (44)
Total operating lease liabilities $ 426