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Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 1,395
2022 954
2023 498
2024 94
2025 6
2026 and thereafter 0
Total lease payments from operating leases $ 2,947