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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0 $ 1 $ 1 $ 5
Interest cost 16 16 48 48
Expected return on plan assets (14) (16) (43) (47)
Amortization of Net actuarial loss 0 1 1 3
Settlement loss 0 0 19 0
Amortization of prior service credit 1 0 1 0
Net periodic cost (credit) 3 2 27 9
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost 0 0 1 1
Amortization of prior service credit (1) (6) (6) (18)
Net periodic cost (credit) $ (1) $ (6) $ (5) $ (17)