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Operating Leases - (Maturities of Operating Leases) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2019 remaining period $ 34
2020 147
2021 121
2022 86
2023 64
Thereafter 181
Total lease payments 633
Less: Imputed interest (79)
Total operating lease liabilities $ 554