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Leasing Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2019 $ 1,339
2020 851
2021 383
2022 86
2023 6
2025 and thereafter 0
Total lease payments from operating leases $ 2,665