Stockholders' Deficit - Accumulated Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ (2,593)	$ (1,960)	$ (3,025)	$ (1,644)
Other comprehensive gain (loss) before reclassifications			(557)
Reclassifications of gain into earnings			(82)
Balance at end of period	(2,245)	(2,376)	(2,245)	(2,376)
Accumulated other comprehensive income (loss)
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(368)	348	285	(245)
Balance at end of period	(354)	238	(354)	238
Net unrealized gains (losses) on available-for-sale debt securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			6
Other comprehensive gain (loss) before reclassifications	1	0	4	(5)
Reclassifications of gain into earnings			0
Balance at end of period	10		10
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			648
Other comprehensive gain (loss) before reclassifications	(50)	121	(613)	877
Reclassifications of gain into earnings	53	$ (228)	(82)	$ (356)
Balance at end of period	(47)		(47)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(323)
Other comprehensive gain (loss) before reclassifications			4
Reclassifications of gain into earnings			0
Balance at end of period	(319)		(319)
Change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period			(46)
Other comprehensive gain (loss) before reclassifications			48
Reclassifications of gain into earnings			0
Balance at end of period	$ 2		$ 2