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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0 $ 2 $ 1 $ 4
Interest cost 16 16 32 32
Expected return on plan assets (15) (15) (29) (31)
Amortization of Net actuarial loss 1 1 1 2
Settlement loss 0 0 19 0
Net periodic cost (credit) 2 4 24 7
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost 1 1 1 1
Amortization of prior service credit (1) (6) (5) (12)
Net periodic cost (credit) $ 0 $ (5) $ (4) $ (11)