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Business Combinations (Details)
$ in Millions
12 Months Ended
Jul. 31, 2018
USD ($)
business
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Future service period 3 years    
Weighted average life of identified intangible assets 4 years    
Goodwill $ 1,611 $ 1,295 $ 1,282
Exactor Inc., TSheets Inc., and Applatix      
Business Acquisition [Line Items]      
Consideration transferred 412    
Fair value of equity awards $ 27    
Number of businesses acquired | business 3    
Net tangible assets $ 385    
Net tangible assets 5    
Identified intangible assets 62    
Goodwill 318    
Expected tax deductible amount 219    
Purchased Technology | Exactor Inc., TSheets Inc., and Applatix      
Business Acquisition [Line Items]      
Identified intangible assets 38    
Customer Lists | Exactor Inc., TSheets Inc., and Applatix      
Business Acquisition [Line Items]      
Identified intangible assets 17    
Covenants Note to Compete | Exactor Inc., TSheets Inc., and Applatix      
Business Acquisition [Line Items]      
Identified intangible assets $ 7