Stockholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at beginning of period			$ (5,881)
Other comprehensive (loss) income before reclassifications			311
Reclassifications of (gains) losses into earnings			(432)
Balance at end of period	(6,002)		(6,002)
Change in net unrealized gains (losses) on available-for-sale securities
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at beginning of period			81
Other comprehensive (loss) income before reclassifications	(41)	(2)	(10)	(2)
Balance at end of period	71		71
Change in net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at beginning of period			108
Other comprehensive (loss) income before reclassifications	2	(234)	432	(204)
Reclassifications of (gains) losses into earnings			(635)
Balance at end of period	(95)		(95)
Change in unrealized components of defined benefit plans
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at beginning of period			(5,376)
Other comprehensive (loss) income before reclassifications			1
Reclassifications of (gains) losses into earnings			203
Balance at end of period	(5,172)		(5,172)
Change in cumulative translation adjustment
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at beginning of period			(694)
Other comprehensive (loss) income before reclassifications			(112)
Balance at end of period	$ (806)		$ (806)