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Business Combinations (Details)
$ in Millions
12 Months Ended
Jul. 31, 2018
USD ($)
business
Jul. 31, 2019
USD ($)
Jul. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Goodwill $ 1,611 $ 1,655 $ 1,295
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