Stockholders' Equity - Schedule of Tax Effects Related to Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Components of accumulated other comprehensive income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	$ (28)	$ (69)	$ 41	$ (50)
Tax effects on change in unrealized gains (losses) on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Tax effects on change arising during the period	0	(3)	0	0
Tax effects on change in unrealized components of cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Tax effects on change arising during the period	(5)	(89)	46	(270)
Tax effects on reclassification into earnings	(20)	48	3	303
Tax (provision) benefit on unrealized gains (losses) arising during the period	(25)	(41)	49	33
Tax (provision) benefit on losses arising during the period
Components of accumulated other comprehensive income, net of taxes
Tax effects on change arising during the period	0	(65)	2	(65)
Tax benefit on amortization of actuarial loss and prior service benefit
Components of accumulated other comprehensive income, net of taxes
Tax effects on reclassification into earnings	(3)	(8)	(9)	(21)
Tax benefit (provision) on settlements and other
Components of accumulated other comprehensive income, net of taxes
Tax effects on reclassification into earnings	0	30	(1)	29
Tax effects on change in unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	(3)	(43)	(8)	(57)
Tax benefit (provision) on change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	$ 0	$ 18	$ 0	$ (26)