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MARKETABLE SECURITIES (Details) (USD $)
In Millions, unless otherwise specified
Oct. 31, 2011
Oct. 31, 2010
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost $ 770 $ 212
Gross Unrealized Gains 18 17
Gross Unrealized Losses 1 1
Fair Value 787.3 227.9
U.S. Government Debt Securities
   
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost 571 57
Gross Unrealized Gains 6 6
Gross Unrealized Losses 1  
Fair Value 576.0 63.0
Municipal Debt Securities
   
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost 34 26
Gross Unrealized Gains 2 2
Fair Value 36.0 28.0
Corporate Debt Securities
   
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost 83 58
Gross Unrealized Gains 6 5
Fair Value 89.0 63.0
Residential Mortgage-Backed Securities
   
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost 82 [1] 69 [1]
Gross Unrealized Gains 4 [1] 4 [1]
Gross Unrealized Losses   1 [1]
Fair Value 86.0 [1] 72.0 [1]
Other Debt Securities
   
Amortized Cost and Fair Value of Marketable Securities    
Amortized Cost   2
Fair Value   $ 2.0
[1] Primarily issued by U.S. government sponsored enterprises.