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MARKETABLE SECURITIES (Details) (USD $)
In Millions, unless otherwise specified
Oct. 31, 2012
Oct. 31, 2011
Amortized cost and fair value of marketable securities    
Amortized Cost $ 1,445 $ 770
Gross Unrealized Gains 26 18
Gross Unrealized Losses 1 1
Fair value, Debt Securities 1,470.4 787.3
U.S. Government Debt Securities
   
Amortized cost and fair value of marketable securities    
Amortized Cost 1,193 571
Gross Unrealized Gains 7 6
Gross Unrealized Losses   1
Fair value, Debt Securities 1,200.0 576.0
Municipal Debt Securities
   
Amortized cost and fair value of marketable securities    
Amortized Cost 35 34
Gross Unrealized Gains 3 2
Fair value, Debt Securities 38.0 36.0
Corporate Debt Securities
   
Amortized cost and fair value of marketable securities    
Amortized Cost 100 83
Gross Unrealized Gains 10 6
Fair value, Debt Securities 110.0 89.0
Mortgage-backed Securities
   
Amortized cost and fair value of marketable securities    
Amortized Cost 117 [1] 82 [1]
Gross Unrealized Gains 6 [1] 4 [1]
Gross Unrealized Losses 1 [1]  
Fair value, Debt Securities $ 122.0 [1] $ 86.0 [1]
[1] Primarily issued by U.S. government sponsored enterprises.