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DERIVATIVE INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2011
Oct. 31, 2010
DERIVATIVE INSTRUMENTS.    
Fair value of derivatives with credit-risk-related contingent features in a liability position $ 23 $ 16
Reduction in maximum loss if derivative counterparties fail to meet obligations - collateral received 25 85
Reduction in maximum loss if derivative counterparties fail to meet obligations - netting provisions 59 58
Cash Flow Hedges    
Cash flow hedge loss recorded in OCI expected to be reclassified within twelve months 4  
Maximum maturity of cash flow hedge interest rate and cross-currency interest rate contracts (in months) 35M  
Fair Value Hedges    
Notional amount of interest rate fair value hedge derivatives 7,730 6,640
Gain (loss) on ineffective portion of interest rate fair value hedge derivatives (5) 1
Derivative Instruments
   
Derivative Instruments    
Maximum loss if derivative counterparties fail to meet obligations 485 520
Interest Rate Contracts
   
Cash Flow Hedges    
Notional amount of cash flow hedge derivatives 1,350 1,060
Gain (Loss) on Fair Value Hedges    
Gains (losses) on interest rate contracts 16 150
Net accrued interest income on interest rate contracts 172 222
Gains (losses) on borrowings (21) (149)
Accrued interest expense on borrowings 277 336
Cross-Currency Interest Rate Contracts
   
Cash Flow Hedges    
Notional amount of cash flow hedge derivatives $ 853 $ 849