Stockholders' Equity - Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period			$ 181
Reclassifications of (gains) losses into earnings			93
Other comprehensive income, net of taxes	$ 319	$ 154	274	$ 33
Change in unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	1	1	2	(9)
Reclassifications of (gains) losses into earnings			0
Change in unrealized components of cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	170	203	181	635
Reclassifications of (gains) losses into earnings	139	(111)	66	(746)
Other comprehensive income, net of taxes	309	92	247	(111)
Losses arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	0	(140)	(2)	(140)
Tax benefit on amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	9	100	27	303
Settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	0	127	0	128
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period			(2)
Reclassifications of (gains) losses into earnings			27
Other comprehensive income, net of taxes	9	87	25	291
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period			0
Reclassifications of (gains) losses into earnings			0
Other comprehensive income, net of taxes	$ 0	$ (26)	$ 0	$ (138)