Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2024	Dec. 24, 2023
Segment Reporting Information [Line Items]
Revenues	$ 11,669	$ 9,935
Cost of revenues	(5,161)	(4,312)
Research and development expenses	(2,230)	(2,096)
Selling, general and administrative expenses	(723)	(627)
Other Operating Income (Expense), Net	0	28
Interest expense	(163)	(178)
EBT	3,635	2,962
Reconciling Items
Segment Reporting Information [Line Items]
Revenues	50	39
Cost of revenues	(59)	(56)
Research and development expenses	(598)	(533)
Selling, general and administrative expenses	(189)	(185)
Other Operating Income (Expense), Net	0	28
Interest expense	(163)	(178)
Investment and other (expense) income, net	221	208
EBT	(788)	(722)
QCT
Segment Reporting Information [Line Items]
Revenues	10,084	8,423
EBT	3,246	2,593
QTL
Segment Reporting Information [Line Items]
Revenues	1,535	1,460
EBT	1,158	1,080
QSI
Segment Reporting Information [Line Items]
Revenues	0	13
EBT	19	11
Other Operating Segment
Segment Reporting Information [Line Items]
Revenues	50	39
Other Operating Segment | Reconciling Items
Segment Reporting Information [Line Items]
EBT	$ 0	$ (6)