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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ equity $ 5,106 $ 3,749 $ 2,816 $ 1,699
Unrealized gain on available-for-sale debt securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ equity 6 1    
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ equity (38) (37)    
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders’ equity $ (32) $ (36) $ (36) $ (22)