Derivative Instruments (Details 3) (Not Designated as Hedging Instruments, USD $) In Millions, unless otherwise specified	Jan. 31, 2015	Oct. 31, 2014	Jan. 31, 2014
Interest Rate Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 2,753	$ 3,076	$ 3,118
Foreign Exchange Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,084	1,364	1,555
Cross-Currency Interest Rate Contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	97	98	86
Interest Rate Caps - Purchased
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,502	1,703	1,458
Interest Rate Caps - Sold
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 1,502	$ 1,703	$ 1,458