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Retirement Plans - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Defined benefit plan lump sum settlement payments estimated     $ 100        
Contribution to defined benefit and other post retirement plans         $ 36 $ 36  
Company's contributions to plan   $ 9   $ 8 26 24  
Defined Contribution Plan 401K [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Company's contributions to plan   $ 11   $ 10 $ 34 $ 32  
Defined Contribution Plan 401K [Member] | Maximum [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Maximum Company matching contribution         4.00%    
Defined Contribution Plan 401K [Member] | First 3% of Participants Compensation [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Matching contributions         100.00%    
Participant's compensation for which company matches contribution         3.00%    
Defined Contribution Plan 401K [Member] | Next 2% of Participants Compensation [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Matching contributions         50.00%    
Participant's compensation for which company matches contribution         2.00%    
Scenario Forecast [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]              
Defined benefit plan non-cash settlement charges $ 25           $ 30