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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jul. 31, 2014
Jul. 31, 2014
Interest rate contracts
Cash flow hedges
Oct. 31, 2013
Interest rate contracts
Cash flow hedges
Jul. 31, 2013
Interest rate contracts
Cash flow hedges
Jul. 31, 2014
Cross-Currency Interest Rate Contracts
Cash flow hedges
Oct. 31, 2013
Cross-Currency Interest Rate Contracts
Cash flow hedges
Jul. 31, 2013
Cross-Currency Interest Rate Contracts
Cash flow hedges
Cash Flow Hedges              
Notional amounts   $ 3,650 $ 3,100 $ 3,100 $ 0 $ 746 $ 746
Cash flow hedge gain (loss) recorded in OCI to be reclassified within twelve months (3)            
Maximum maturity of cash flow hedge interest rate and cross-currency interest rate contracts 27 months            
Gains or losses reclassified from OCI to earnings $ 0