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Business Combinations Narrative (Details) - Credit Karma - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 03, 2020
Jan. 31, 2021
Jan. 31, 2021
Business Acquisition [Line Items]      
Transaction cost associated with the acquisition   $ 26 $ 31
Consideration transferred $ 8,100    
Fair value of purchase price 7,194    
Cash paid for acquisition $ 3,400    
Share price (in dollars per share) $ 355.49    
Shares of Common Stock      
Business Acquisition [Line Items]      
Equity interest issued (in shares) 10.6    
Equity interest issued $ 3,800    
Revest Provision      
Business Acquisition [Line Items]      
Equity interest issued $ 275    
Period of recognition for equity awards 3 years    
Equity Award      
Business Acquisition [Line Items]      
Period of recognition for equity awards 3 years    
Equity awards assumed included in purchase price $ (47)    
Equity awards assumed not included in purchase price 663    
Restricted Stock Units (RSUs)      
Business Acquisition [Line Items]      
Equity interest issued 300    
Restricted Stock Units (RSUs) | Employees of Credit Karma      
Business Acquisition [Line Items]      
Equity interest issued $ 300    
Period of recognition for equity awards 4 years