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Notes Receivable and Allowances for Loan Losses (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2023
Oct. 31, 2023
Oct. 31, 2022
Jul. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans purchased from originating bank partner, principal balance   $ 279 $ 26  
Commitment to purchase, amount originated before period end   $ 13    
Period past due considered delinquent   1 day    
Minimum commitment to sell participation interest in unsecured term loans $ 250      
Notes receivable held for sale   $ 9   $ 0
Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Term of commitment 18 months      
Small Business Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable, net   $ 743   $ 757