Stockholders' Equity (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2012
Stockholders' Equity
Repurchases of common stock (in shares)		16	56	59
Share repurchases settled	$ 3,000,000	$ 365,000,000	$ 1,053,000,000	$ 1,495,000,000
Share repurchase authorization remaining			8,100,000,000
Tax benefit (expense) on change in unrealized gains/losses on available-for-sale securities:
Tax benefit (expense) on unrealized gains/losses arising during the period	27,000,000	(2,000,000)	(11,000,000)	3,000,000
Tax benefit (expense) on change in unrealized gains/losses on available-for-sale securities	27,000,000	(2,000,000)	(11,000,000)	3,000,000
Tax (expense) benefit on change in unrealized gains/losses on cash flow hedges:
Tax (expense) benefit on unrealized gains/losses arising during the period	(14,000,000)	(157,000,000)	46,000,000	(249,000,000)
Tax (benefit) expense on gains/losses reclassified into earnings	(4,000,000)	91,000,000	(11,000,000)	128,000,000
Tax (expense) benefit on change in unrealized gains/losses on cash flow hedges	(18,000,000)	(66,000,000)	35,000,000	(121,000,000)
Tax (expense) benefit on change in unrealized components of defined benefit plans:
Tax (expense) benefit on net losses arising during the period	(8,000,000)	6,000,000	(8,000,000)	30,000,000
Tax expense (benefit) on amortization of actuarial loss and prior service benefit	10,000,000	(7,000,000)	(11,000,000)	(23,000,000)
Tax (expense) benefit on curtailments, settlements and other	(3,000,000)	2,000,000	(4,000,000)	(62,000,000)
Tax (expense) benefit on change in unrealized components of defined benefit plans	(1,000,000)	1,000,000	(23,000,000)	(55,000,000)
Tax benefit (expense) on change in cumulative translation adjustment		43,000,000	22,000,000	5,000,000
Tax benefit (expense) on other comprehensive income/loss	8,000,000	(24,000,000)	23,000,000	(168,000,000)
Accumulated Other Comprehensive Loss, net of taxes
Net unrealized gain on available-for-sale securities	60,000,000		60,000,000		87,000,000
Net unrealized loss on cash flow hedges	(89,000,000)		(89,000,000)		(99,000,000)
Unrealized components of defined benefit plans	(4,812,000,000)		(4,812,000,000)		(5,090,000,000)
Cumulative translation adjustment	(592,000,000)		(592,000,000)		(457,000,000)
Accumulated other comprehensive loss	$ (5,433,000,000)		$ (5,433,000,000)		$ (5,559,000,000)