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Expected Annual Amortization Expense Related to Acquired Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 26, 2015
Sep. 27, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2016 $ 1,288  
2017 1,033  
2018 786  
2019 342  
2020 166  
Thereafter 178  
Definite-lived and amortizable acquired intangible assets, Net Carrying Amount $ 3,793 $ 4,042