Segment Information EBT and Total Assets for Reportable Segments (Details) (USD $) In Millions | 3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 25, 2011 | Jun. 26, 2011 | Mar. 27, 2011 | Dec. 26, 2010 | Sep. 26, 2010 | Jun. 27, 2010 | Mar. 28, 2010 | Dec. 27, 2009 | Sep. 25, 2011 | Sep. 26, 2010 | Sep. 27, 2009 | |
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | $ 4,117 | $ 3,623 | $ 3,870 | $ 3,348 | $ 2,952 | $ 2,700 | $ 2,661 | $ 2,668 | $ 14,957 | $ 10,982 | $ 10,387 |
| EBT | 5,687 | 4,493 | 2,403 | ||||||||
| Total assets | 36,422 | 30,572 | 36,422 | 30,572 | 27,445 | ||||||
QCT [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | 8,859 | 6,695 | 6,135 | ||||||||
| EBT | 2,056 | 1,693 | 1,441 | ||||||||
| Total assets | 1,569 | 1,085 | 1,569 | 1,085 | 892 | ||||||
QTL [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | 5,422 | 3,659 | 3,605 | ||||||||
| EBT | 4,753 | 3,020 | 3,068 | ||||||||
| Total assets | 36 | 28 | 36 | 28 | 89 | ||||||
QWI [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | 656 | 628 | 641 | ||||||||
| EBT | (152) | 12 | 20 | ||||||||
| Total assets | 136 | 129 | 136 | 129 | 142 | ||||||
QSI [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | 0 | 0 | 0 | ||||||||
| EBT | (132) | 7 | (54) | ||||||||
| Total assets | 2,386 | 2,745 | 2,386 | 2,745 | 1,614 | ||||||
Reconciling Items [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | 20 | 0 | 6 | ||||||||
| EBT | (838) | (239) | (2,072) | ||||||||
| Total assets | $ 32,295 | $ 26,585 | $ 32,295 | $ 26,585 | $ 24,708 | ||||||