Stockholders' Equity - Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Accumulated Other Comprehensive Income
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision)	$ (6)	$ (8)	$ (15)	$ 2
Change in Net Unrealized Gains (Losses) on Cash Flow Hedges
Components of accumulated other comprehensive income, net of taxes
Tax (provision) on net unrealized gains (losses) arising during the period	(22)	(17)	(32)	(18)
Tax provision (benefit) on net (gains) losses reclassified into earnings	12	8	21	24
Tax benefit (provision)	(10)	(9)	(11)	6
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision)	1	(3)	(8)	(5)
Unrealized Losses Arising During the Period
Components of accumulated other comprehensive income, net of taxes
Tax (provision) on net unrealized gains (losses) arising during the period	0	(2)	0	8
Actuarial Loss and Net Prior Service Benefit
Components of accumulated other comprehensive income, net of taxes
Tax provision (benefit) on net (gains) losses reclassified into earnings	(4)	(3)	(8)	(6)
Curtailments, settlements and other
Components of accumulated other comprehensive income, net of taxes
Tax provision (benefit) on net (gains) losses reclassified into earnings	5	2	0	(7)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision)	$ 3	$ 4	$ 4	$ 1

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