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Changes in Accrued Warranties and Related Costs (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]      
Beginning accrued warranty and related costs $ 4,159 $ 2,967 $ 1,638
Cost of warranty claims (4,401) (3,760) (3,703)
Accruals for product warranty 5,022 4,952 5,032
Ending accrued warranty and related costs $ 4,780 $ 4,159 $ 2,967