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Business Combinations - Additional information (Details) - Credit Karma - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 03, 2020
Jul. 31, 2021
Jul. 31, 2020
Dec. 02, 2020
Business Acquisition [Line Items]        
Acquisition costs   $ 31 $ 28  
Consideration transferred $ 8,100      
Total preliminary purchase price allocation 7,195      
Payments to acquire businesses $ 3,400      
Service period of equity awards assumed 3 years      
Share price (in dollars per share)       $ 355.49
Estimated useful life 14 years 4 months 24 days      
Common Stock        
Business Acquisition [Line Items]        
Business acquisition, equity interest issued (in shares) 10.6      
Fair value of equity awards $ 3,800      
Equity Award        
Business Acquisition [Line Items]        
Consideration transferred liabilities incurred, included in purchase price 47      
Consideration transferred liabilities incurred, not included in purchase price 663      
Revest Provision        
Business Acquisition [Line Items]        
Fair value of equity awards 275      
Restricted Stock Units (RSUs)        
Business Acquisition [Line Items]        
Fair value of equity awards   $ 300    
Restricted Stock Units (RSUs) | Empolyees of Credit Karma        
Business Acquisition [Line Items]        
Fair value of equity awards $ 300      
Service period of equity awards assumed 4 years