Stockholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Stockholders' Equity
Cash dividends declared per share (in dollars per share)	$ 0.50	$ 0.40	$ 0.32
Repurchases of common stock (in shares)	67	259	241
Share repurchases settled		262	240
Share repurchases settled	$ 1,619,000,000	$ 10,117,000,000	$ 11,042,000,000
Shares settled during period executed in prior period		4	3
Share repurchase authorization increase after balance sheet date		10,000,000,000	18,000,000,000
Share repurchase authorization remaining	9,200,000,000
Tax (expense) benefit on change in unrealized gains/ losses on available - for- sale securities:
Tax benefit (expense) on change in unrealized gains/ losses on available - for- sale securities	25,000,000		(9,000,000)
Tax (expense) benefit on change in unrealized gains/ losses on cash flow hedges:
Tax (expense) benefit on unrealized gains/losses arising during the period	(137,000,000)	86,000,000	(119,000,000)
Tax expense (benefit) on gains/losses reclassified into earnings	143,000,000	(210,000,000)	149,000,000
Tax (expense) benefit on change in unrealized gains/ losses on cash flow hedges	6,000,000	(124,000,000)	30,000,000
Tax (expense) benefit on change in unrealized components of defined benefit plans:
Tax benefit on net losses arising during the period	261,000,000	263,000,000	123,000,000
Tax expense on amortization of actuarial loss and prior service benefit	(31,000,000)	(36,000,000)	(42,000,000)
Tax (expense) benefit on curtailments, settlements and other	(48,000,000)	2,000,000	2,000,000
Tax (expense) benefit on change in unrealized components of defined benefit plans	182,000,000	229,000,000	83,000,000
Tax expense on change in cumulative translation adjustment	(25,000,000)	(20,000,000)	(31,000,000)
Tax benefit on other comprehensive loss/ income	188,000,000	85,000,000	73,000,000
Accumulated Other Comprehensive Income (Loss), net of taxes
Net unrealized gain on available-for-sale securities	87,000,000	37,000,000	20,000,000
Net unrealized gain (loss) on cash flow hedges	(99,000,000)	(41,000,000)	(201,000,000)
Cumulative translation adjustment	(457,000,000)	(385,000,000)	(431,000,000)
Unrealized components of defined benefit plans	(5,090,000,000)	(3,109,000,000)	(3,225,000,000)
Accumulated other comprehensive loss	$ (5,559,000,000)	$ (3,498,000,000)	$ (3,837,000,000)