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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1 $ 4 $ 5 $ 10
Interest cost 16 16 48 48
Expected return on plan assets (16) (15) (47) (44)
Amortization of Net actuarial loss 1 1 3 5
Settlement (gain) loss 0 0 0 2
Net periodic cost (credit) 2 6 9 21
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 (6) (6) (18) (18)
Net periodic cost (credit) $ (6) $ (6) $ (17) $ (17)