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DERIVATIVE INSTRUMENTS (Details 2) - Interest Rate Contracts - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Oct. 31, 2015
Fair Value Hedges      
Gains (losses) on ineffective portion of interest rate fair value hedge derivatives $ 0 $ 3  
Gain (Loss) on Fair Value Hedges      
Gains (losses) on interest rate contracts 75 176  
Net accrued interest income on interest rate contracts 39 45  
Gains (losses) on borrowings (75) (173)  
Accrued interest expense on borrowings 67 70  
Fair Value Hedges | Designated as Hedging Instruments      
Fair Value Hedges      
Notional amount of interest rate fair value hedge derivatives $ 8,833 $ 8,408 $ 8,618