Stockholders' Equity (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			$ (5,881)
Other comprehensive (loss) income before reclassifications			476
Reclassifications of (gains) losses into earnings			(443)
Balance at end of period	$ (5,848)		(5,848)
Change in unrealized gains (losses) on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			81
Other comprehensive (loss) income before reclassifications	1	$ 8	(9)	$ 6
Balance at end of period	72		72
Change in net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			108
Other comprehensive (loss) income before reclassifications	203	$ 82	635	$ (122)
Reclassifications of (gains) losses into earnings			(746)
Balance at end of period	(3)		(3)
Change in unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(5,376)
Other comprehensive (loss) income before reclassifications			(12)
Reclassifications of (gains) losses into earnings			303
Balance at end of period	(5,085)		(5,085)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(694)
Other comprehensive (loss) income before reclassifications			(138)
Balance at end of period	$ (832)		$ (832)