Stockholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at the beginning of the period	$ (3,778)
Other comprehensive income (loss) before reclassifications	(2,479)
Reclassifications of (gains) losses into earnings	376
Balance at the end of the period	(5,881)
Change in unrealized gains on available-for-sale securities
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at the beginning of the period	76
Other comprehensive income (loss) before reclassifications	6	38	50
Reclassifications of (gains) losses into earnings	(1)
Balance at the end of the period	81	76
Change in unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at the beginning of the period	(188)
Other comprehensive income (loss) before reclassifications	163	(146)	198
Reclassifications of (gains) losses into earnings	133
Balance at the end of the period	108	(188)
Change in unrealized components of defined benefit plans
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at the beginning of the period	(3,084)
Other comprehensive income (loss) before reclassifications	(2,533)
Reclassifications of (gains) losses into earnings	241
Balance at the end of the period	(5,376)
Change in cumulative translation adjustment
Components of accumulated other comprehensive (loss) income, net of taxes
Balance at the beginning of the period	(582)
Other comprehensive income (loss) before reclassifications	(112)
Balance at the end of the period	$ (694)