Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			$ (3,408)
Other comprehensive (loss) income before reclassifications			25
Reclassifications of (gains) losses into earnings			352
Reclassifications of curtailments, settlements and other into earnings			2
Balance at end of period	$ (1,767)		(1,767)
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(1,418)
Balance at end of period	(1,039)		(1,039)
Net unrealized gains on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			12
Other comprehensive (loss) income before reclassifications	2	$ 1	(2)	$ 4
Reclassifications of (gains) losses into earnings	0	0	(5)	0
Reclassifications of curtailments, settlements and other into earnings			0
Balance at end of period	5		5
Net unrealized (losses) gains on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(240)
Other comprehensive (loss) income before reclassifications	247	(456)	26	(688)
Reclassifications of (gains) losses into earnings	15	$ 36	329	$ (40)
Reclassifications of curtailments, settlements and other into earnings			0
Balance at end of period	115		115
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(1,190)
Other comprehensive (loss) income before reclassifications			1
Reclassifications of (gains) losses into earnings			28
Reclassifications of curtailments, settlements and other into earnings			2
Balance at end of period	$ (1,159)		$ (1,159)