Segment Information (Details) $ in Millions		12 Months Ended
		Sep. 27, 2026 USD ($) numberOfBusinesses	Sep. 28, 2025 USD ($)	Sep. 29, 2024 USD ($)
Segment Reporting
Revenues		$ 43,120	$ 44,284	$ 38,962
Cost of revenues		20,222	19,738	17,060
Investment and other income, net		1,445	972	962
Costs and Expenses		34,462	31,929	28,891
Research and development expense		(10,207)	(9,042)	(8,893)
Selling, general and administrative expense		(3,701)	(3,110)	(2,759)
Other expense		(332)	(39)	(179)
Interest expense		(689)	(664)	(697)
Income from continuing operations before income taxes		$ 9,414	12,663	10,336
Number of Reportable Segments | numberOfBusinesses		3
Operating Segments
Segment Reporting
Revenues		$ 42,764	43,949	38,786
Income from continuing operations before income taxes		14,917	15,893	13,658
Reconciling Items
Segment Reporting
Cost of revenues		400	270	229
Research and development expense		(2,829)	(2,357)	(2,277)
Selling, general and administrative expense		(1,166)	(783)	(781)
Other expense		(332)	(39)	(179)
Interest expense		(689)	(664)	(697)
Investment and other Income, net		640	779	855
Reconciling Items | Licensing Agreements
Segment Reporting
Revenues		(120)	143	0
QCT
Segment Reporting
Revenues		37,208	38,367	33,196
QCT | Operating Segments
Segment Reporting
Revenue from Contract with Customer, Excluding Assessed Tax		37,208	38,367	33,196
Cost of revenues		19,460	19,302	16,648
Operating Expenses		7,647	7,395	7,021
Income from continuing operations before income taxes		10,101	11,670	9,527
QTL | Operating Segments
Segment Reporting
Revenue from Contract with Customer, Excluding Assessed Tax		5,556	5,582	5,572
Costs and Expenses	[1]	1,534	1,539	1,545
Income from continuing operations before income taxes		4,022	4,043	4,027
QSI | Operating Segments
Segment Reporting
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	18
Cost of revenues		0	0	7
Operating Expenses		11	13	12
Investment and other income, net		805	193	105
Income from continuing operations before income taxes		794	180	104
Nonreportable Segments | Reconciling Items
Segment Reporting
Revenues		476	192	176
Income from continuing operations before income taxes		$ (607)	$ (39)	$ (14)

[1] Substantially all of QTL’s costs and expenses are comprised of operating expenses