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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 2 $ 3
Interest cost 16 16
Expected return on plan assets (16) (15)
Amortization of Net actuarial loss 1 2
Net periodic cost (credit) 3 6
Lump-sum Settlement Payment 4  
Defined Benefit Plan, Plan Assets, Contributions by Employer 5 9
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 37  
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Amortization of prior service credit (6) (6)
Net periodic cost (credit) $ (6) $ (6)