ACQUISITION OF SPIRENT and OSG (Details) - USD ($) $ in Millions				1 Months Ended	12 Months Ended
	Oct. 27, 2025	Oct. 17, 2025	Oct. 15, 2025	Oct. 31, 2025	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Business Combination [Line Items]
Business Combination, Recognized Liability Assumed, Deferred Tax Liability				$ 168	$ 168
Goodwill arising from acquisitions					1,001	$ 738
Share-based compensation expense					176	145	$ 136
Payments to Acquire Businesses, Net of Cash Acquired					2,022	681	85
Net loss from discontinued operations, net of income taxes					19	0	$ 0
Business Combination, Pro Forma Information [Line Items]
Disposal Group, Including Discontinued Operation, Intangible Assets			$ 346
Disposal Group, Including Discontinued Operation, Goodwill			55
Disposal Group, Including Discontinued Operation, Intangible Assets			346
Disposal Group, Including Discontinued Operation, Inventory			26
Disposal Group, Including Discontinued Operation, Other Assets			6
CSG
Business Combination [Line Items]
Goodwill arising from acquisitions					724	181
EISG
Business Combination [Line Items]
Goodwill arising from acquisitions					$ 277	$ 557
Developed Technology
Business Combination, Pro Forma Information [Line Items]
Disposal Group, Including Discontinued Operation, Intangible Assets			295
Disposal Group, Including Discontinued Operation, Intangible Assets			295
Customer Relationships
Business Combination, Pro Forma Information [Line Items]
Disposal Group, Including Discontinued Operation, Intangible Assets			50
Disposal Group, Including Discontinued Operation, Intangible Assets			50
Spirent plc
Business Combination [Line Items]
Acquisition effective date					Oct. 15, 2025
Payments to Acquire Businesses, Gross			1,564
Business Combination, Recognized Liability Assumed, Liability			14
Business Combination, Recognized Liability Assumed, Deferred Tax Liability			168
Goodwill arising from acquisitions			698
Business Combination, Integration-Related Cost, Expense					$ 42
Share-based compensation expense					$ 7
Payments to Acquire Businesses, Net of Cash Acquired			1,415
PreCombination FV of replacement share-based awards issued			14
Cash acquired from acquisition			127
Currency impact on consideration transferred	$ 8
Business Combination, Acquiree's Revenue since Acquisition Date, Actual				9
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual				$ (40)
Spirent plc | CSG
Business Combination [Line Items]
Goodwill arising from acquisitions			653
Spirent plc | EISG
Business Combination [Line Items]
Goodwill arising from acquisitions			$ 45
Synopsys' Optical Solutions Group business
Business Combination [Line Items]
Acquisition effective date					Oct. 17, 2025
Payments to Acquire Businesses, Gross		$ 581
Goodwill arising from acquisitions		298
Business Combination, Integration-Related Cost, Expense					$ 18
Share-based compensation expense					$ 1
PreCombination FV of replacement share-based awards issued		3
Synopsys' Optical Solutions Group business | CSG
Business Combination [Line Items]
Goodwill arising from acquisitions		67
Synopsys' Optical Solutions Group business | EISG
Business Combination [Line Items]
Goodwill arising from acquisitions		$ 231