Acquisitions (Details) $ / shares in Units, shares in Millions, $ in Millions			6 Months Ended
		Dec. 18, 2025 USD ($) shares	Mar. 29, 2026 USD ($) numberOfBusinesses $ / shares shares	Sep. 28, 2025 USD ($)
Acquisitions
Goodwill			$ 14,251	$ 11,358
Alphawave
Acquisitions
Business Combination, Consideration Transferred		$ 2,300
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Value		$ 1,800
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares | shares		11
Payments to Acquire Businesses, Gross		$ 301
Cash		51
Intangible assets subject to amortization		239
In-process research and development (IPR&D)		107
Goodwill		2,215
Other assets		283
Total assets		2,895
Convertible debt (1)	[1]	(278)
Other liabilities		(343)
Total liabilities		(621)
Net assets acquired		$ 2,274
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life		5 years
Business Combination, Goodwill, Expected Tax Deductible, Amount		$ 0
Alphawave | Exchangeable Shares
Acquisitions
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Value		453
Common Stock, No Par Value | $ / shares			$ 0
Common Stock, Shares Authorized, Unlimited [Fixed List]			Unlimited
Common Stock, Other Shares, Outstanding | shares			4
Exchangeable Shares Issued, Fair Value		$ 746
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period		4 years
2026 Other Business Acquisitions
Acquisitions
Payments to Acquire Businesses, Gross			$ 985
Intangible assets subject to amortization			272
Goodwill			$ 698
Business Combination, Number of Businesses Acquired | numberOfBusinesses			6
2026 Other Business Acquisitions | QCT
Acquisitions
Goodwill			$ 622
2026 Other Business Acquisitions | Data Center Operating Segment
Acquisitions
Goodwill			$ 76

[1] Alphawave's outstanding unsecured convertible bonds were settled in the second quarter of fiscal 2026.