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Cash and Cash Equivalents, Investments and Funds Held for Customers - Type of issue (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Jul. 31, 2015
Apr. 30, 2015
Jul. 31, 2014
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, amortized cost $ 1,289 $ 808 $ 1,193 $ 849
Available-for-sale securities:        
Total cash and cash equivalents, investments, and funds held for customers, Amortized Cost 2,013 2,062    
Total cash and cash equivalents, investments, and funds held for customers, Fair Value 2,013 2,061    
Total cash and cash equivalents        
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, amortized cost 1,486 970    
Cash and cash equivalents, fair value disclosure 1,486 970    
Municipal bonds        
Available-for-sale securities:        
Investments and funds, amortized cost 175 507    
Investments and funds, fair value 175 506    
Corporate notes        
Available-for-sale securities:        
Investments and funds, amortized cost 241 546    
Investments and funds, fair value 241 546    
U.S. agency securities        
Available-for-sale securities:        
Investments and funds, amortized cost 83 12    
Investments and funds, fair value 83 12    
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 514 1,080    
Investments and funds, fair value 514 1,079    
Other long-term investments        
Available-for-sale securities:        
Other long-term investments 13 12    
Investments and funds, fair value $ 13 $ 12