Stockholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Changes and reclassifications related to other comprehensive income, net of taxes
Balance at the beginning of the period			$ (3,778)
Other comprehensive income (loss) before reclassifications			(262)
Reclassifications of (gains) losses into earnings			430
Balance at the end of the period	(3,610)		(3,610)
Net unrealized gain on available-for-sale securities
Changes and reclassifications related to other comprehensive income, net of taxes
Balance at the beginning of the period			76
Other comprehensive income (loss) before reclassifications	8	38	6	22
Reclassifications of (gains) losses into earnings			(1)
Balance at the end of the period	81		81
Net unrealized loss on cash flow hedges
Changes and reclassifications related to other comprehensive income, net of taxes
Balance at the beginning of the period			(188)
Other comprehensive income (loss) before reclassifications	82	102	(122)	2
Reclassifications of (gains) losses into earnings			251
Balance at the end of the period	(59)		(59)
Unrealized components of defined benefit plans
Changes and reclassifications related to other comprehensive income, net of taxes
Balance at the beginning of the period			(3,084)
Other comprehensive income (loss) before reclassifications			(76)
Reclassifications of (gains) losses into earnings			180
Balance at the end of the period	(2,980)		(2,980)
Cumulative translation adjustment
Changes and reclassifications related to other comprehensive income, net of taxes
Balance at the beginning of the period			(582)
Other comprehensive income (loss) before reclassifications			(70)
Balance at the end of the period	$ (652)		$ (652)