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Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Leases [Abstract]  
2021 $ 430
2022 1,461
2023 1,027
2024 396
2025 72
2026 and thereafter 5
Total lease payments from operating leases $ 3,391