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Cash and Cash Equivalents, Investments and Funds Held for Customers - Classification on Balance Sheets (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
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    
Cash and cash equivalents        
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, amortized cost 360 638    
Cash and cash equivalents, fair value disclosure 360 638    
Investments        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, amortized cost 245 441    
Investments and funds, fair value 245 442    
Funds held for customers        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, amortized cost 326 304    
Investments and funds, fair value 326 304    
Long-term investments        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, amortized cost 28 28    
Investments and funds, fair value $ 28 $ 28