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Segment Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 28, 2026
USD ($)
Jun. 29, 2025
USD ($)
Jun. 28, 2026
USD ($)
numberOfBusinesses
Jun. 29, 2025
USD ($)
Segment Reporting [Line Items]        
Number of Reportable Segments | numberOfBusinesses     3  
Revenues $ 9,947 $ 10,365 $ 32,798 $ 33,013
Cost of revenues (4,670) (4,606) (15,138) (14,704)
Research and development expenses (2,607) (2,226) (7,523) (6,672)
Selling, general and administrative expenses (976) (771) (2,738) (2,200)
Other (68) 0 (97) 0
Interest expense (178) (168) (519) (493)
Costs and Expenses 8,321 7,603 25,496 23,576
Investment and other income, net 1,014 358 1,458 748
EBT 2,462 2,952 8,241 9,692
Reconciling Items        
Segment Reporting [Line Items]        
Cost of revenues (97) (65) (272) (185)
Research and development expenses (755) (595) (2,069) (1,752)
Selling, general and administrative expenses (323) (182) (896) (554)
Other (68) 0 (97) 0
Interest expense (178) (168) (519) (493)
Investment and other (expense) income, net 256 210 532 567
Reconciling Items | Licensing Agreements        
Segment Reporting [Line Items]        
Revenues 0 0 0 143
Operating Segments        
Segment Reporting [Line Items]        
Revenues 9,782 10,311 32,445 32,718
EBT 3,841 3,762 11,981 11,981
QCT | Operating Segments        
Segment Reporting [Line Items]        
Revenues 8,504 8,993 28,193 28,546
Revenues 8,504 8,993 28,193 28,546
Cost of revenues 4,452 4,497 14,598 14,395
Operating Expenses 1,860 1,825 5,636 5,377
EBT 2,192 2,671 7,959 8,774
QTL | Operating Segments        
Segment Reporting [Line Items]        
Revenues 1,278 1,318 4,252 4,172
Costs and Expenses [1] 397 376 1,147 1,144
EBT 881 942 3,105 3,028
QSI | Operating Segments        
Segment Reporting [Line Items]        
Revenues 0 0 0 0
Operating Expenses 3 3 8 9
Investment and other income, net 771 152 925 188
EBT 768 149 917 179
Other Operating Segment | Reconciling Items        
Segment Reporting [Line Items]        
Revenues 165 54 353 152
EBT $ (214) $ (10) $ (419) $ (15)
[1] Substantially all of QTL’s costs and expenses are comprised of operating expenses.