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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Table of cash and cash equivalents, investments, and funds held for customers by investment type (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Amortized Cost        
Total cash and cash equivalents $ 1,464 $ 529 $ 638 $ 808
Total available-for-sale debt securities 454 462    
Total cash and cash equivalents, investments, and funds held for customers 2,098 1,179    
Fair Value        
Total available-for-sale debt securities 452 463    
Total cash and cash equivalents, investments, and funds held for customers 2,096 1,180    
Gross realized gains and losses on our available-for-sale debt securities 0 0 $ 0  
Gross unrealized gains and losses on our available-for-sale debt securities 0 0    
Total cash and cash equivalents        
Amortized Cost        
Total cash and cash equivalents 1,631 701    
Fair Value        
Total cash and cash equivalents 1,631 701    
Municipal bonds        
Amortized Cost        
Total available-for-sale debt securities 31 63    
Fair Value        
Total available-for-sale debt securities 31 63    
Municipal auction rate securities        
Amortized Cost        
Total available-for-sale debt securities 0 15    
Fair Value        
Total available-for-sale debt securities 0 15    
Corporate notes        
Amortized Cost        
Total available-for-sale debt securities 414 381    
Fair Value        
Total available-for-sale debt securities 412 382    
U.S. agency securities        
Amortized Cost        
Total available-for-sale debt securities 9 3    
Fair Value        
Total available-for-sale debt securities 9 3    
Total available-for-sale debt securities        
Amortized Cost        
Total available-for-sale debt securities 454 462    
Fair Value        
Total available-for-sale debt securities 452 463    
Other long-term investments        
Amortized Cost        
Other long-term investments 13 16    
Fair Value Measurement | Other long-term investments        
Amortized Cost        
Other long-term investments $ 13 $ 16