Stockholders' Deficit - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Stockholders' Equity Note [Abstract]
Repurchases of common stock (shares)	0	27,000,000	3,600,000	69,000,000
Payment in connection with repurchases of shares		$ 1,000	$ 100	$ 2,518
Shares settled (in shares)		1,000,000		1,000,000
Share repurchase authorization remaining	$ 2,000		$ 2,000