Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			$ (639)
Other comprehensive income (loss) before reclassifications			228
Reclassifications of losses (gains) into earnings			(208)
Reclassifications of curtailments, settlements and other into earnings			(38)
Balance at end of period	$ (1,131)		(1,131)
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(845)
Balance at end of period	(863)		(863)
Net unrealized gains on available-for-sale debt securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			5
Other comprehensive income (loss) before reclassifications	0	$ 2	0	$ (2)
Reclassifications of losses (gains) into earnings	0	0	3	(5)
Reclassifications of curtailments, settlements and other into earnings			0
Balance at end of period	8		8
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			291
Other comprehensive income (loss) before reclassifications	173	247	248	26
Reclassifications of losses (gains) into earnings	(72)	$ 15	(225)	$ 329
Reclassifications of curtailments, settlements and other into earnings			0
Balance at end of period	314		314
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(1,141)
Other comprehensive income (loss) before reclassifications			(15)
Reclassifications of losses (gains) into earnings			25
Reclassifications of curtailments, settlements and other into earnings			(38)
Balance at end of period	(1,169)		(1,169)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			0
Other comprehensive income (loss) before reclassifications			(5)
Reclassifications of losses (gains) into earnings			(11)
Reclassifications of curtailments, settlements and other into earnings			0
Balance at end of period	$ (16)		$ (16)