Segment Information (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 28, 2025	Sep. 29, 2024	Sep. 24, 2023
Segment Reporting Information
Revenues		$ 44,284	$ 38,962	$ 35,820
Cost of revenues		19,738	17,060	15,869
Investment and other income, net		972	962	349
Costs and Expenses		31,929	28,891	28,032
Research and development expense		(9,042)	(8,893)	(8,818)
Selling, general and administrative expense		(3,110)	(2,759)	(2,483)
Other expense		(39)	(179)	(862)
Interest expense		(664)	(697)	(694)
Income from continuing operations before income taxes		12,663	10,336	7,443
Operating Segments
Segment Reporting Information
Revenues		43,949	38,786	35,716
Income from continuing operations before income taxes		15,893	13,658	11,540
Reconciling Items
Segment Reporting Information
Cost of revenues		270	229	205
Research and development expense		(2,357)	(2,277)	(2,034)
Selling, general and administrative expense		(783)	(781)	(588)
Other expense		(39)	(179)	(862)
Interest expense		(664)	(697)	(694)
Investment and other Income, net		779	855	364
Reconciling Items | Licensing Agreements
Segment Reporting Information
Revenues		143	0	(40)
QCT
Segment Reporting Information
Revenues		38,367	33,196	30,382
QCT | Operating Segments
Segment Reporting Information
Revenue from Contract with Customer, Excluding Assessed Tax		38,367	33,196	30,382
Cost of revenues		19,302	16,648	15,367
Operating Expenses		7,395	7,021	7,091
Income from continuing operations before income taxes		11,670	9,527	7,924
QTL | Operating Segments
Segment Reporting Information
Revenue from Contract with Customer, Excluding Assessed Tax		5,582	5,572	5,306
Costs and Expenses	[1]	1,539	1,545	1,678
Income from continuing operations before income taxes		4,043	4,027	3,628
QSI | Operating Segments
Segment Reporting Information
Revenue from Contract with Customer, Excluding Assessed Tax		0	18	28
Cost of revenues		0	7	15
Operating Expenses		13	12	12
Investment and other income, net		193	105	(13)
Income from continuing operations before income taxes		180	104	(12)
Nonreportable Segments | Reconciling Items
Segment Reporting Information
Revenues		192	176	144
Income from continuing operations before income taxes		$ (39)	$ (14)	$ (38)

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