FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Millions, unless otherwise specified	Apr. 30, 2012	Oct. 31, 2011	Apr. 30, 2011
Contractual Maturities of Debt Securities, Amortized Cost
Amortized cost, due in one year or less	$ 614
Amortized cost, due after one through five years	460
Amortized cost, due after five through 10 years	77
Amortized cost, due after 10 years	56
Amortized cost, residential mortgage-backed securities	109
Amortized cost, debt securities	1,316
Contractual Maturities of Debt Securities, Fair Value
Fair value, due in one year or less	614
Fair value, due after one through five years	465
Fair value, due after five through 10 years	84
Fair value, due after 10 years	62
Fair value, residential mortgage-backed securities	114
Fair value, debt securities	$ 1,338.9	$ 787.3	$ 239.5

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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