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NEW ACCOUNTING PRONOUNCEMENTS - Statement of Operations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Apr. 30, 2016
Jul. 31, 2016
Jul. 31, 2015
Provision for income taxes $ 10   $ 15   $ 57 $ 39
Net income $ 124   $ 111   $ 336 $ 261
Net income per share - Basic $ 0.38   $ 0.33   $ 1.03 $ 0.78
Net income per share - Diluted $ 0.38   $ 0.33   $ 1.02 $ 0.78
Weighted average shares used in computing net income per share - Diluted 328   334   329 336
As Previously Reported            
Provision for income taxes   $ 19   $ 45    
Net income   $ 123   $ 214    
Net income per share - Basic   $ 0.37   $ 0.65    
Net income per share - Diluted   $ 0.37   $ 0.65    
Weighted average shares used in computing net income per share - Diluted   332   330    
As Adjusted            
Provision for income taxes   $ 21   $ 47    
Net income   $ 121   $ 212    
Net income per share - Basic   $ 0.37   $ 0.65    
Net income per share - Diluted   $ 0.36   $ 0.64    
Weighted average shares used in computing net income per share - Diluted   332   330