Stockholders’ Deficit - Schedule of Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ (1,193)	$ (639)	$ (3,408)
Other comprehensive loss before reclassifications	(199)
Losses (gains) reclassified into earnings	7
Balance at end of period	(2,228)	(1,193)	(639)
Net unrealized gains on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	9
Other comprehensive loss before reclassifications	2	1	(2)
Losses (gains) reclassified into earnings	0	3	(5)
Balance at end of period	11	9
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	172
Other comprehensive loss before reclassifications		215	299
Losses (gains) reclassified into earnings		(334)	232
Balance at end of period		172
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Other comprehensive loss before reclassifications	(181)
Losses (gains) reclassified into earnings	(57)
Balance at end of period	(66)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(1,410)
Other comprehensive loss before reclassifications	(18)
Losses (gains) reclassified into earnings	64
Balance at end of period	(1,190)	(1,410)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	4
Other comprehensive loss before reclassifications	(2)
Losses (gains) reclassified into earnings	0
Balance at end of period	2	4
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(1,225)	(845)	(1,418)
Balance at end of period	(1,243)	$ (1,225)	$ (845)
Reclassifications of curtailments, settlements and other into earnings
Components of accumulated other comprehensive income, net of taxes
Losses (gains) reclassified into earnings	$ 174