Summary of Share-Based Compensation Expense (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 26, 2016 |
Mar. 28, 2015 |
Mar. 26, 2016 |
Mar. 28, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Share-based compensation expense | $ 1,048 | $ 927 | $ 2,126 | $ 1,815 |
| Cost of sales | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Share-based compensation expense | 191 | 142 | 395 | 282 |
| Research and Development | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Share-based compensation expense | 468 | 384 | 934 | 758 |
| Selling, General and Administrative | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
| Share-based compensation expense | $ 389 | $ 401 | $ 797 | $ 775 |