Stockholders' Deficit - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Stockholders' Equity Note [Abstract]
Repurchases of common stock (shares)	27	52	69	113
Payment in connection with repurchases of shares	$ 1,000	$ 1,600	$ 2,518	$ 2,988
Shares settled (in shares)	1	2
Share repurchase authorization remaining	$ 3,900		$ 3,900