Stockholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Components of accumulated other comprehensive loss, net of taxes
Balance at the beginning of the period			$ (3,778)
Other comprehensive income (loss) before reclassifications			(312)
Reclassifications of (gains) losses into earnings			261
Balance at the end of the period	(3,829)		(3,829)
Net unrealized gain on available-for-sale securities
Components of accumulated other comprehensive loss, net of taxes
Balance at the beginning of the period			76
Other comprehensive income (loss) before reclassifications	(2)	14	(2)	(16)
Reclassifications of (gains) losses into earnings			(1)
Balance at the end of the period	73		73
Net unrealized loss on cash flow hedges
Components of accumulated other comprehensive loss, net of taxes
Balance at the beginning of the period			(188)
Other comprehensive income (loss) before reclassifications	(234)	112	(204)	(100)
Reclassifications of (gains) losses into earnings			147
Balance at the end of the period	(245)		(245)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive loss, net of taxes
Balance at the beginning of the period			(3,084)
Other comprehensive income (loss) before reclassifications			(57)
Reclassifications of (gains) losses into earnings			115
Balance at the end of the period	(3,026)		(3,026)
Cumulative translation adjustment
Components of accumulated other comprehensive loss, net of taxes
Balance at the beginning of the period			(582)
Other comprehensive income (loss) before reclassifications			(49)
Balance at the end of the period	$ (631)		$ (631)