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Goodwill and Acquired Intangible Assets - Acquired intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Finite-Lived Intangible Assets [Abstract]    
Cost $ 4,166 $ 744
Accumulated amortization (914) (716)
Acquired intangible assets, net $ 3,252 $ 28
Weighted average life in years 14 years 4 years
Expected Future Amortization Expense    
2022 $ 274  
2023 264  
2024 248  
2025 247  
2026 247  
Thereafter 1,972  
Acquired intangible assets, net 3,252 $ 28
Customer Lists / User Relationships    
Finite-Lived Intangible Assets [Abstract]    
Cost 3,038 256
Accumulated amortization (377) (248)
Acquired intangible assets, net $ 2,661 $ 8
Weighted average life in years 15 years 5 years
Expected Future Amortization Expense    
Acquired intangible assets, net $ 2,661 $ 8
Purchased Technology    
Finite-Lived Intangible Assets [Abstract]    
Cost 686 421
Accumulated amortization (455) (404)
Acquired intangible assets, net $ 231 $ 17
Weighted average life in years 5 years 3 years
Expected Future Amortization Expense    
Acquired intangible assets, net $ 231 $ 17
Trade Names and Logos    
Finite-Lived Intangible Assets [Abstract]    
Cost 400 25
Accumulated amortization (41) (25)
Acquired intangible assets, net $ 359 $ 0
Weighted average life in years 15 years 0 years
Expected Future Amortization Expense    
Acquired intangible assets, net $ 359 $ 0
Covenants Not to Compete or Sue    
Finite-Lived Intangible Assets [Abstract]    
Cost 42 42
Accumulated amortization (41) (39)
Acquired intangible assets, net $ 1 $ 3
Weighted average life in years 3 years 3 years
Expected Future Amortization Expense    
Acquired intangible assets, net $ 1 $ 3