Taxes on Earnings - Schedule of (Benefit from) Provision for Taxes on Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
U.S. federal taxes:
Current	$ (24)	$ (987)	$ 751
Deferred	(68)	149	(3,132)
Non-U.S. taxes:
Current	319	386	528
Deferred	164	(3)	(563)
State taxes:
Current	23	(160)	61
Deferred	(27)	(14)	41
Provision for (benefit from) taxes	$ 387	$ (629)	$ (2,314)