Stockholders' Equity - Changes and Reclassifications Related to Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive (loss) income, net of taxes	$ (60)	$ 475
Net unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	1
Losses reclassified into earnings	8
Change in net unrealized (losses) gains on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	(156)
Losses reclassified into earnings	26
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	1
Losses reclassified into earnings	37
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	23
Losses reclassified into earnings	0
Reclassifications of gains (losses) into earnings | Net unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	1	(14)
Losses reclassified into earnings	8	0
Other comprehensive (loss) income, net of taxes	9	(14)
Reclassifications of gains (losses) into earnings | Change in net unrealized (losses) gains on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	(156)	105
Losses reclassified into earnings	26	(131)
Other comprehensive (loss) income, net of taxes	(130)	(26)
Reclassifications of gains (losses) into earnings | Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive (loss) income, net of taxes	38	539
Reclassifications of gains (losses) into earnings | Gains arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses reclassified into earnings	1	455
Reclassifications of gains (losses) into earnings | Amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses reclassified into earnings	44	91
Reclassifications of gains (losses) into earnings | Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive (loss) income, net of taxes	(7)	(7)
Reclassifications of gains (losses) into earnings | Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive (loss) income, net of taxes	$ 23	$ (24)