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Taxes on Earnings - Deferred Tax Assets and Liabilities included in Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Current and long term deferred tax assets and liabilities
Deferred tax assets	$ 2,023	$ 1,778
Deferred tax liabilities	(494)	(290)
Net deferred tax assets and liabilities	1,529	1,488
Operating loss carryforwards
Adjustment to reduce deferred tax asset	93	118
Valuation allowance on deferred tax assets	7,368	$ 7,724
State
Operating loss carryforwards
Operating loss carryforwards	3,200
Capital loss carryforwards	6,000
State | Operating loss carryforwards
Operating loss carryforwards
Valuation allowance on deferred tax assets	171
State | Capital loss carryforwards
Operating loss carryforwards
Valuation allowance on deferred tax assets	181
Foreign
Operating loss carryforwards
Operating loss carryforwards	19,800
Capital loss carryforwards	112
Foreign | Operating loss carryforwards
Operating loss carryforwards
Valuation allowance on deferred tax assets	4,400
Foreign | Capital loss carryforwards
Operating loss carryforwards
Valuation allowance on deferred tax assets	33
Federal
Operating loss carryforwards
Operating loss carryforwards	555
Capital loss carryforwards	6,000
Federal | Capital loss carryforwards
Operating loss carryforwards
Valuation allowance on deferred tax assets	$ 1,300

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