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Benefit Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance under stock plans (in shares) 445.2   445.2  
RSUs granted vesting period     4 years  
Fair value of vested RSUs as of vesting date $ 2,300 $ 1,300 $ 4,300 $ 2,600
Stock options outstanding 1.6   1.6  
Stock options, Weighted average exercise price per share $ 16.62   $ 16.62  
Stock options, Weighted average remaining contractual term     3 years 4 months 24 days  
Stock options, Aggregate intrinsic value $ 177   $ 177  
Total intrinsic value of options at the time of exercise 72 271 439 978
Income tax benefit related to share-based compensation expense 286 $ 260 948 $ 755
Total unrecognized compensation cost on stock options and RSUs $ 7,300   $ 7,300  
Total unrecognized compensation cost on stock options and RSUs, weighted-average recognition period (in years)     2 years 9 months 18 days