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Leases Future Minimum Capital and Operating Lease Payments and Related Present Value of Capital Lease Payments (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
Operating Leases, 2018 $ 352
Operating Leases, 2019 287
Operating Leases, 2020 200
Operating Leases, 2021 111
Operating Leases, 2022 71
Operating Leases, After 2022 172
Operating Leases, Total minimum lease payments $ 1,193