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Cash and Cash Equivalents, Investments and Funds Held for Customers - Classification on Balance Sheets (Details) - USD ($)
$ in Millions
Oct. 31, 2015
Jul. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, Amortized Cost $ 474 $ 808 $ 542 $ 849
Total cash and cash equivalents, investments, and funds held for customers, Amortized Cost 849 2,062    
Total cash and cash equivalents, investments, and funds held for customers, Fair Value 849 2,061    
Cash and cash equivalents        
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, Amortized Cost 474 808    
Cash and cash equivalents, Fair Value Disclosure 474 808    
Investments        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 0 890    
Investments and funds, Fair Value 0 889    
Funds held for customers        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 347 337    
Investments and funds, Fair Value 347 337    
Long-term investments        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 28 27    
Investments and funds, Fair Value $ 28 $ 27