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Notes Receivable and Allowances for Loan Losses (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jul. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans purchased from originating bank partner, principal balance   $ 748 $ 64    
Commitment to purchase, amount originated before period end   $ 13   $ 13  
Period past due considered delinquent   1 day   1 day  
Minimum commitment to sell participation interest in unsecured term loans $ 250        
Notes receivable, remaining amount held for sale   $ 176   $ 176  
Notes receivable held for sale   21   21 $ 0
Loans sold       74  
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   807   807 757
Refund Advance Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commitment to purchase, amount originated before period end   70   70  
Notes receivable, net   $ 329   $ 329 $ 5