Taxes on Earnings - Provision for Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Net income tax benefits	$ 244	$ 1,300	$ 2,800
Tax benefits related to audit settlements	124	1,000	1,500
Restructuring benefits	82	57
Proxy contest costs	20
Other net tax benefits	17
Utilization of tax attributes		75
Net valuation allowance release		94	601
Tax reform benefits		78
Income tax benefit for adjustments associated to uncertain tax positions		51
Excess tax benefits on stock options, restricted stock and performance share units,		20
Provisional tax benefit			760
Deferred tax liability on unremitted earnings			5,600
Provisional deemed repatriation tax			3,300
Remeasurement of deferred assets and liabilities			1,200
Expected valuation allowance on net expense related to deferred tax assets			317
Tax charge (benefit) related to other items			34
Excess tax benefits on stock options, restricted stock and performance share units			42
Income tax benefits, reduced rates for subsidiaries in certain countries	$ 344	$ 386	$ 578
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share)	$ 0.24	$ 0.25	$ 0.35