Segment Information (Details) $ in Millions		3 Months Ended
		Dec. 28, 2025 USD ($) numberOfBusinesses	Dec. 29, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | numberOfBusinesses		3
Revenues		$ 12,252	$ 11,669
Cost of revenues		(5,568)	(5,161)
Research and development expenses		(2,453)	(2,230)
Selling, general and administrative expenses		(865)	(723)
Interest expense		(169)	(163)
Costs and Expenses		8,886	8,114
Investment and other income, net		350	243
EBT		3,547	3,635
Reconciling Items
Segment Reporting Information [Line Items]
Cost of revenues		(82)	(59)
Research and development expenses		(698)	(598)
Selling, general and administrative expenses		(300)	(189)
Interest expense		(169)	(163)
Investment and other (expense) income, net		169	221
Operating Segments
Segment Reporting Information [Line Items]
Revenues		12,205	11,619
EBT		4,712	4,423
QCT | Operating Segments
Segment Reporting Information [Line Items]
Revenues		10,613	10,084
Revenues		10,613	10,084
Cost of revenues		5,446	5,064
Operating Expenses		1,865	1,774
EBT		3,302	3,246
QTL | Operating Segments
Segment Reporting Information [Line Items]
Revenues		1,592	1,535
Costs and Expenses	[1]	361	377
EBT		1,231	1,158
QSI | Operating Segments
Segment Reporting Information [Line Items]
Revenues		0	0
Operating Expenses		3	3
Investment and other income, net		182	22
EBT		179	19
Other Operating Segment | Reconciling Items
Segment Reporting Information [Line Items]
Revenues		47	50
EBT		$ (85)	$ 0

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