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Notes Receivable and Allowances for Loan Losses (Details) - USD ($)
$ in Millions
Apr. 30, 2023
Jul. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, net $ 759 $ 540
Period past due considered delinquent 1 day  
Small Business Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, net $ 752 540
Refund Advance Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, net   $ 0