Stockholders’ Deficit - Narrative (Details) - USD ($)		12 Months Ended
	Feb. 20, 2020	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Feb. 22, 2020
Stockholders' Equity Note [Abstract]
Repurchases of common stock (in shares)		168,000,000	118,000,000	111,000,000
Payment in connection with repurchases of shares		$ 3,107,000,000	$ 2,405,000,000	$ 2,557,000,000
Share repurchases that will be settled in subsequent period (shares)		2,300,000	900,000	1,000,000.0
Authorized amount					$ 15,000,000,000.0
Share repurchase authorization remaining		$ 12,700,000,000
Common stock dividends, preferred share purchase right declared (in shares)	1