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Summary of Significant Accounting Policies - Expected Aggregate Annual Amortization Expense for Existing Amortizable Intangible Assets (Detail)
$ in Millions
Oct. 03, 2015
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2016 $ 209
2017 197
2018 192
2019 187
2020 $ 181