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Changes in Accrued Warranties and Related Costs (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning accrued warranty and related costs $ 4,780 $ 4,159
Cost of warranty claims (1,269) (1,044)
Accruals for product warranty 1,725 2,080
Ending accrued warranty and related costs $ 5,236 $ 5,195