Stockholders’ Deficit - Changes and Reclassifications Related to Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	$ (199)
Losses (gains) reclassified into earnings	7
Other comprehensive (loss) income, net of taxes	(18)	$ (380)	$ 573
Net unrealized gains on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	2	1	(2)
Losses (gains) reclassified into earnings	0	3	(5)
Other comprehensive (loss) income, net of taxes	2	4	(7)
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	(181)
Losses (gains) reclassified into earnings	(57)
Other comprehensive (loss) income, net of taxes	(238)
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period		215	299
Losses (gains) reclassified into earnings		(334)	232
Other comprehensive (loss) income, net of taxes		(119)	531
Unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	(18)
Losses (gains) reclassified into earnings	64
Other comprehensive (loss) income, net of taxes	220	(269)	49
(Losses) gains arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	(18)	(239)	11
Amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses (gains) reclassified into earnings	64	32	37
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses (gains) reclassified into earnings	174	(62)	1
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	(2)
Losses (gains) reclassified into earnings	0
Other comprehensive (loss) income, net of taxes	$ (2)	$ 4	$ 0

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

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