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Cash and Cash Equivalents, Investments and Funds Held for Customers - Type of issue (Details) - USD ($)
$ in Millions
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, amortized cost $ 360 $ 638 $ 474 $ 808
Available-for-sale securities:        
Total cash and cash equivalents, investments, and funds held for customers, Amortized Cost 959 1,411    
Total cash and cash equivalents, investments, and funds held for customers, Fair Value 959 1,412    
Total cash and cash equivalents        
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, amortized cost 486 742    
Cash and cash equivalents, fair value disclosure 486 742    
Municipal bonds        
Available-for-sale securities:        
Investments and funds, amortized cost 89 186    
Investments and funds, fair value 89 186    
Corporate notes        
Available-for-sale securities:        
Investments and funds, amortized cost 356 419    
Investments and funds, fair value 356 420    
U.S. agency securities        
Available-for-sale securities:        
Investments and funds, amortized cost 0 36    
Investments and funds, fair value 0 36    
Municipal auction rate securities        
Available-for-sale securities:        
Investments and funds, amortized cost 15 15    
Investments and funds, fair value 15 15    
Total available-for-sale debt securities        
Available-for-sale securities:        
Investments and funds, amortized cost 460 656    
Investments and funds, fair value 460 657    
Other long-term investments        
Available-for-sale securities:        
Other long-term investments 13 13    
Investments and funds, fair value $ 13 $ 13