Stockholders' Equity (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2012
Stockholders' Equity
Repurchases of common stock (in shares)	36	13	56	43
Share repurchases settled	$ 797,000,000	$ 350,000,000	$ 1,050,000,000	$ 1,130,000,000
Share repurchase authorization remaining			8,100,000,000
Tax (expense) benefit on change in unrealized gains/ losses on available-for-sale securities
Tax (expense) benefit on change in unrealized gains/ losses on available-for-sale securities	(5,000,000)		(38,000,000)	5,000,000
Tax (expense) benefit on change in unrealized gains/ losses on cash flow hedges:
Tax (expense) benefit on unrealized gains/losses arising during the period	(42,000,000)	60,000,000	60,000,000	(92,000,000)
Tax expense (benefit) on gains/losses reclassified into earnings	10,000,000		(7,000,000)	37,000,000
Tax (expense) benefit on change in unrealized gains/ losses on cash flow hedges	(32,000,000)	60,000,000	53,000,000	(55,000,000)
Tax (expense) benefit on change in unrealized components of defined benefit plans:
Tax benefit (expense) on net losses arising during the period				24,000,000
Tax (benefit) expense on amortization of actuarial loss and prior service benefit	(16,000,000)	(6,000,000)	(21,000,000)	(16,000,000)
Tax benefit (expense) on curtailments, settlements and other		20,000,000	(1,000,000)	(64,000,000)
Tax (expense) benefit on change in unrealized components of defined benefit plans	(16,000,000)	14,000,000	(22,000,000)	(56,000,000)
Tax benefit (expense) on change in cumulative translation adjustment	4,000,000	(52,000,000)	22,000,000	(38,000,000)
Tax (expense) benefit on other comprehensive income	(49,000,000)	22,000,000	15,000,000	(144,000,000)
Accumulated Other Comprehensive Loss, net of taxes
Net unrealized gain on available-for-sale securities	71,000,000		71,000,000		87,000,000
Net unrealized loss on cash flow hedges	(166,000,000)		(166,000,000)		(99,000,000)
Unrealized components of defined benefit plans	(4,934,000,000)		(4,934,000,000)		(5,090,000,000)
Cumulative translation adjustment	(493,000,000)		(493,000,000)		(457,000,000)
Accumulated other comprehensive loss	$ (5,522,000,000)		$ (5,522,000,000)		$ (5,559,000,000)