Composition of Certain Financial Statement Captions Other Intangible Assets (Details) (USD $) In Millions | Sep. 25, 2011 | Sep. 26, 2010 |
|---|---|---|
| Intangible Assets [Line Items] | ||
| Gross carrying amount | $ 3,991 | $ 3,584 |
| Accumulated amortization | (892) | (562) |
Spectrum Licenses [Member] | ||
| Intangible Assets [Line Items] | ||
| Gross carrying amount | 20 | 766 |
| Accumulated amortization | (2) | (2) |
Marketing-related [Member] | ||
| Intangible Assets [Line Items] | ||
| Gross carrying amount | 72 | 21 |
| Accumulated amortization | (18) | (13) |
Technology-based [Member] | ||
| Intangible Assets [Line Items] | ||
| Gross carrying amount | 3,767 | 2,785 |
| Accumulated amortization | (802) | (537) |
Customer-related [Member] | ||
| Intangible Assets [Line Items] | ||
| Gross carrying amount | 132 | 12 |
| Accumulated amortization | $ (70) | $ (10) |