Derivative Instruments (Details 3) (Not Designated as Hedging Instruments, USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Oct. 31, 2013	Jul. 31, 2013
Interest rate contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 3,148	$ 2,950	$ 2,874
Foreign Exchange Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,357	1,339	1,438
Cross-Currency Interest Rate Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	78	85	79
Interest Rate Caps- Purchased
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,858	1,641	1,795
Interest Rate Caps- Sold
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 1,858	$ 1,641	$ 1,795