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Accounting for Leases as a Lessor - Finance Lease Receivable Maturity (Details) - USD ($)
$ in Millions
Oct. 31, 2021
Oct. 31, 2020
Leases [Abstract]    
2022 $ 4,338  
2023 2,557  
2024 1,567  
2025 747  
2026 233  
Thereafter 84  
Total undiscounted cash flows 9,526 $ 9,448
Present value of lease payments (recognized as finance receivables) 8,808  
Difference between undiscounted cash flows and discounted cash flows $ 718