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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 1 $ 2
Interest cost 16 16
Expected return on plan assets (14) (16)
Amortization of Net actuarial loss 0 1
Settlement loss 19 0
Net periodic cost (credit) 22 3
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Amortization of prior service credit (4) (6)
Net periodic cost (credit) $ (4) $ (6)