Stockholders' Equity - Changes and Reclassifications of OCI (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Other comprehensive (loss) income, net of taxes	$ (169)	$ (509)	$ (137)
Net unrealized gains (losses) on available-for-sale securities
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Net unrealized gains (losses) arising during the period	(1)	9	(3)
(Gains) losses reclassified into earnings	(4)	(3)	(9)
Other comprehensive (loss) income, net of taxes	(5)	6	(12)
Net unrealized gains (losses) on cash flow hedges
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Net unrealized gains (losses) arising during the period	(50)	275	147
(Gains) losses reclassified into earnings	0	(328)	7
Other comprehensive (loss) income, net of taxes	(50)	(53)	154
Change in unrealized components of defined benefit plans
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Net unrealized gains (losses) arising during the period	(348)
(Gains) losses reclassified into earnings	241
Other comprehensive (loss) income, net of taxes	(107)	(444)	(232)
Losses arising during the period
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
(Gains) losses reclassified into earnings	(348)	(661)	(421)
Actuarial loss and net prior service benefit
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
(Gains) losses reclassified into earnings	232	203	177
Curtailments, settlements and other
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Other comprehensive (loss) income, net of taxes	9	14	12
Cumulative translation adjustment
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Net unrealized gains (losses) arising during the period	(7)	(18)	(67)
(Gains) losses reclassified into earnings	0
Release of cumulative translation adjustment as a result of divestitures and country exits	0	0	20
Other comprehensive (loss) income, net of taxes	$ (7)	$ (18)	$ (47)

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

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