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STOCKHOLDER"S EQUITY - Dividends (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Dividends Paid [Abstract]          
Cash paid per share for dividends previously declared       $ 0.264 $ 0.22
Aggregate cash paid for dividends previously declared       $ 88 $ 76
Quarterly Common Stock dividend aggregate amount $ 44        
Cash dividends declared per common share $ 0.132 $ 0.13 $ 0 $ 0.26 $ 0.22
Dividends Payment Date Jul. 23, 2014        
Dividends Payable Record Date Jul. 01, 2014