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Fair Value Measurements - Schedule of cash equivalents and available-for-sale debt securities by balance sheet classification (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Cash equivalents:      
Total cash and cash equivalents $ 2,848 $ 2,796  
Available-for-sale debt securities:      
Long-term Investments 105 98  
Level 3      
Available-for-sale debt securities:      
Upward adjustments to non-marketable equity securities 0 54 $ 17
Cumulative upward adjustments to non-marketable equity securities 71    
Fair Value, Measurements, Recurring      
Cash equivalents:      
Total cash and cash equivalents 1,888 1,835  
Available-for-sale debt securities:      
Total available-for-sale debt securities 1,014 685  
Fair Value, Measurements, Recurring | Level 1      
Cash equivalents:      
Total cash and cash equivalents 1,888 1,835  
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring | Level 2      
Cash equivalents:      
Total cash and cash equivalents 0 0  
Available-for-sale debt securities:      
Total available-for-sale debt securities 1,014 685  
Fair Value, Measurements, Recurring | In cash and cash equivalents      
Cash equivalents:      
Total cash and cash equivalents 1,888 1,835  
Fair Value, Measurements, Recurring | In cash and cash equivalents | Level 1      
Cash equivalents:      
Total cash and cash equivalents 1,888 1,835  
Fair Value, Measurements, Recurring | In cash and cash equivalents | Level 2      
Cash equivalents:      
Total cash and cash equivalents 0 0  
Fair Value, Measurements, Recurring | In investments      
Available-for-sale debt securities:      
Total available-for-sale debt securities 814 485  
Fair Value, Measurements, Recurring | In investments | Level 1      
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring | In investments | Level 2      
Available-for-sale debt securities:      
Total available-for-sale debt securities 814 485  
Fair Value, Measurements, Recurring | In funds receivable and amounts held for customers      
Available-for-sale debt securities:      
Total available-for-sale debt securities 200 200  
Fair Value, Measurements, Recurring | In funds receivable and amounts held for customers | Level 1      
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring | In funds receivable and amounts held for customers | Level 2      
Available-for-sale debt securities:      
Total available-for-sale debt securities $ 200 $ 200