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DERIVATIVE INSTRUMENTS - Fair Value Hedges (Details) - Interest Rate Contracts - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Fair Value Hedges    
Gains (losses) on ineffective portion of interest rate fair value hedge derivatives $ (2) $ 2
Gain (Loss) on Fair Value Hedges    
Gains (losses) on interest rate contracts 7 104
Net accrued interest income on interest rate contracts 146 173
Gains (losses) on borrowings (9) (102)
Accrued interest expense on borrowings 290 274
Fair Value Hedges | Designated as Hedging Instruments    
Fair Value Hedges    
Notional amount of interest rate fair value hedge derivatives $ 8,844 $ 8,618