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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) (USD $)
Share data in Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2012
2009 Share Repurchase Program
Apr. 30, 2012
2009 Share Repurchase Program
Jan. 16, 2013
2009 Share Repurchase Program
Nov. 19, 2009
2009 Share Repurchase Program
May 14, 2013
2013 Share Repurchase Program
Jan. 16, 2013
2013 Share Repurchase Program
Apr. 30, 2013
2013 Share Repurchase Program
Apr. 30, 2013
2013 Share Repurchase Program
Share Repurchase Program [Line Items]                    
Share repurchase program approval date           November 19, 2009   January 16, 2013    
Initial amount authorized               $ 500,000,000    
Increase amount authorized             500,000,000      
New authorized amount             1,000,000,000      
Number of shares of common stock repurchased under share repurchase program (in shares)     1 2         3 5
Cost to repurchases shares of common stock under share repurchase program 219,000,000 78,000,000 44,000,000 78,000,000         140,000,000 219,000,000
Remaining amount authorized for repurchases under 2013 repurchase program             $ 781,000,000      
2009 Share repurchase program termination date         January 16, 2013