Taxes on Earnings - Provision for Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Provision For Taxes [Line Items]
Net income tax benefits	$ 1,300	$ 2,800	$ 72
Tax benefits related to audit settlements	1,000	1,500
Utilization of tax attributes	75
Restructuring benefits	57
Net valuation allowance release	94	601
Tax reform benefits	78
Income tax benefit for adjustments associated to uncertain tax positions	51		49
Excess tax benefits on stock options, restricted stock and performance share units,	20		19
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
Net tax charges (benefits) on restructuring and pension related costs			84
Income tax benefit related to acquisition-related charges			45
Other tax benefit			13
Tax charges related to state tax impacts or state rate changes			22
Income tax benefits, reduced rates for subsidiaries in certain countries	$ 386	$ 578	$ 471
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share)	$ 0.25	$ 0.35	$ 0.28
Federal
Provision For Taxes [Line Items]
Income tax benefit related to provision to return adjustments			$ 12
State
Provision For Taxes [Line Items]
Income tax benefit related to provision to return adjustments			$ (11)