Stockholders' Equity (Details 2) $ in Millions	12 Months Ended
	Oct. 31, 2015 USD ($)
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ 26,731
Balance at end of period	27,768
Change in unrealized (losses) gains 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	(15)
Balance at end of period	66
Change in unrealized (losses) gains 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	797
Reclassifications of (gains) losses into earnings	(944)
Balance at end of period	(39)
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	(404)
Reclassifications of (gains) losses into earnings	425
Balance at end of period	(5,355)
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	(280)
Balance at end of period	(974)
Accumulated Other Comprehensive (Loss) Income
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(5,881)
Other comprehensive (loss) income before reclassifications	98
Reclassifications of (gains) losses into earnings	(519)
Balance at end of period	$ (6,302)