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Cash and Cash Equivalents, Investments, and Funds Receivable and Amounts Held for Customers - Type of Issue (Details) - USD ($)
Jan. 31, 2023
Jul. 31, 2022
Jan. 31, 2022
Jul. 31, 2021
Cash and Cash Equivalents Items [Line Items]        
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period $ 1,549,000,000 $ 2,997,000,000 $ 1,433,000,000 $ 2,819,000,000
Available-for-sale securities:        
Available-for-sale debt securities, amortized cost 734,000,000 694,000,000    
Available-for-sale debt securities, fair value 724,000,000 685,000,000    
Total cash and cash equivalents, investments, and funds held for customers, amortized cost 2,457,000,000 3,721,000,000    
Total cash and cash equivalents, investments, and funds held for customers, fair value 2,447,000,000 3,712,000,000    
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, amortized cost 2,283,000,000 3,691,000,000    
Total cash, cash equivalents, restricted cash, restricted cash equivalents, and investments, fair value 2,273,000,000 3,682,000,000    
Credit losses related to available-for-sale securities 0      
Total cash, cash equivalents, restricted cash, and restricted cash equivalents        
Cash and Cash Equivalents Items [Line Items]        
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period 1,549,000,000 2,997,000,000    
Cash, cash equivalents, restricted cash, and restricted cash equivalents, fair value 1,549,000,000 2,997,000,000    
Corporate notes        
Available-for-sale securities:        
Available-for-sale debt securities, amortized cost 605,000,000 597,000,000    
Available-for-sale debt securities, fair value 597,000,000 589,000,000    
U.S. agency securities        
Available-for-sale securities:        
Available-for-sale debt securities, amortized cost 129,000,000 97,000,000    
Available-for-sale debt securities, fair value 127,000,000 96,000,000    
Funds Receivable And Funds Held For Customers Not Measured Or Recorded At Fair Value        
Available-for-sale securities:        
Available-for-sale debt securities, amortized cost $ 174,000,000 $ 30,000,000