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Stockholders' Equity - Changes and Reclassifications Of OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), net of taxes	$ 70	$ (76)
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	2	2
(Gains) losses reclassified into earnings	(3)	(3)
Other comprehensive income (loss), net of taxes	(1)	(1)
Change in net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	65	33
(Gains) losses reclassified into earnings	(60)	(117)
Other comprehensive income (loss), net of taxes	5	(84)
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	17
(Gains) losses reclassified into earnings	52
Other comprehensive income (loss), net of taxes	69	0
Net unrealized gains (losses) arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	17	(45)
Amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	57	49
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), net of taxes	(5)	(4)
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications	(3)
(Gains) losses reclassified into earnings	0
Other comprehensive income (loss), net of taxes	$ (3)	$ 9

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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