Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Oct. 31, 2011
Interest rate contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 2,380	$ 2,361
Foreign Exchange Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,298	979
Cross-Currency Interest Rate Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	78	52
Interest Rate Caps- Purchased
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,445	1,402
Interest Rate Caps- Sold
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 1,445	$ 1,402