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Summary of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Selected Quarterly Financial Information [Abstract]                      
Net sales $ 51,501 $ 49,605 $ 58,010 $ 74,599 $ 42,123 $ 37,432 $ 45,646 $ 57,594 $ 233,715 $ 182,795 $ 170,910
Gross margin 20,548 19,681 23,656 29,741 16,009 14,735 17,947 21,846 93,626 70,537 64,304
Net income $ 11,124 $ 10,677 $ 13,569 $ 18,024 $ 8,467 $ 7,748 $ 10,223 $ 13,072 $ 53,394 $ 39,510 $ 37,037
Earnings per share:                      
Basic $ 1.97 [1] $ 1.86 [1] $ 2.34 [1] $ 3.08 [1] $ 1.43 [1] $ 1.29 [1] $ 1.67 [1] $ 2.08 [1] $ 9.28 $ 6.49 $ 5.72
Diluted $ 1.96 [1] $ 1.85 [1] $ 2.33 [1] $ 3.06 [1] $ 1.42 [1] $ 1.28 [1] $ 1.66 [1] $ 2.07 [1] $ 9.22 $ 6.45 $ 5.68
[1] Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.