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Business Combinations (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 24, 2020
USD ($)
$ / shares
Jul. 31, 2018
USD ($)
business
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 1,611 $ 1,654 $ 1,655
Exactor Inc., TSheets Inc., and Applatix        
Business Acquisition [Line Items]        
Consideration transferred   412    
Fair value of equity awards   $ 27    
Future service period   3 years    
Number of businesses acquired | business   3    
Net tangible assets   $ 385    
Amount allocated of purchase consideration to net tangible assets   5    
Identified intangible assets   $ 62    
Weighted average life of identified intangible assets   4 years    
Goodwill   $ 318    
Expected tax deductible amount   219    
Exactor Inc., TSheets Inc., and Applatix | Purchased Technology        
Business Acquisition [Line Items]        
Identified intangible assets   38    
Exactor Inc., TSheets Inc., and Applatix | Customer Lists        
Business Acquisition [Line Items]        
Identified intangible assets   17    
Exactor Inc., TSheets Inc., and Applatix | Covenants Note to Compete        
Business Acquisition [Line Items]        
Identified intangible assets   $ 7    
Credit Karma Inc        
Business Acquisition [Line Items]        
Consideration transferred $ 7,100      
Share price (US dollars per share) | $ / shares $ 299.7306      
Termination date, term from signing date 10 months      
Option to extend termination date, extension period 5 months      
Termination fee, minimum $ 230      
Termination fee, maximum 350      
Equity Award | Credit Karma Inc        
Business Acquisition [Line Items]        
Fair value of equity awards $ 1,000      
Service period 3 years      
Restricted Stock Units (RSUs) | Credit Karma Inc        
Business Acquisition [Line Items]        
Fair value of equity awards $ 300      
Service period 4 years