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Fair Value Measurements - Balance Sheet Classification (Details) - USD ($)
$ in Millions
Apr. 30, 2022
Jul. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: $ 3,531 $ 2,562
Available-for-sale debt securities: 573 1,508
Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 2,627 1,660
Available-for-sale debt securities: 573 1,508
Fair value, measurements, recurring | In funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 17 0
Fair value, measurements, recurring | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 2,610 1,660
Fair value, measurements, recurring | Available for sale debt securities in investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: 373 1,308
Fair value, measurements, recurring | Available for sale debt securities in funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: 200 200
Fair value, measurements, recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 2,627 1,660
Available-for-sale debt securities: 0 0
Fair value, measurements, recurring | Level 1 | In funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 17 0
Fair value, measurements, recurring | Level 1 | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 2,610 1,660
Fair value, measurements, recurring | Level 1 | Available for sale debt securities in investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: 0 0
Fair value, measurements, recurring | Level 1 | Available for sale debt securities in funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: 0 0
Fair value, measurements, recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Available-for-sale debt securities: 573 1,508
Fair value, measurements, recurring | Level 2 | In funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair value, measurements, recurring | Level 2 | In cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair value, measurements, recurring | Level 2 | Available for sale debt securities in investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: 373 1,308
Fair value, measurements, recurring | Level 2 | Available for sale debt securities in funds held for customers    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities: $ 200 $ 200