Composition of Certain Financial Statement Items Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 28, 2025		Sep. 29, 2024
Goodwill [Roll Forward]
Beginning balance		$ 10,799	[1]	$ 10,642
Acquisitions		526		126
Foreign currency translation adjustments		33		31
Ending balance	[1]	11,358		10,799
Cumulative goodwill impairments		812		812
QCT
Goodwill [Roll Forward]
Beginning balance		10,065	[1]	9,909
Acquisitions		526		126
Foreign currency translation adjustments		32		30
Ending balance	[1]	10,623		10,065
QTL
Goodwill [Roll Forward]
Beginning balance		734	[1]	733
Acquisitions		0		0
Foreign currency translation adjustments		1		1
Ending balance	[1]	$ 735		$ 734

[1] Cumulative goodwill impairments were $812 million at both September 28, 2025 and September 29, 2024.