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DERIVATIVE INSTRUMENTS (Details 2) (Interest Rate Contracts, USD $)
In Millions, unless otherwise specified
3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Oct. 31, 2014
Fair Value Hedges      
Gains (losses) on ineffective portion of interest rate fair value hedge derivatives $ 3us-gaap_GainLossOnInterestRateFairValueHedgeIneffectiveness $ (2)us-gaap_GainLossOnInterestRateFairValueHedgeIneffectiveness  
Gain (Loss) on Fair Value Hedges      
Gains (losses) on interest rate contracts 176us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 (69)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1  
Net accrued interest income on interest rate contracts 45de_AccruedInterestIncome 36de_AccruedInterestIncome  
Gains (losses) on borrowings (173)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1 67us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1  
Accrued interest expense on borrowings 70de_AccruedInterestExpense 59de_AccruedInterestExpense  
Fair Value Hedges Member
     
Fair Value Hedges      
Notional amount of interest rate fair value hedge derivatives $ 8,408invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_FairValueHedgingMember
$ 8,185invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_FairValueHedgingMember
$ 8,798invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_FairValueHedgingMember