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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 4 $ 4 $ 10 $ 11
Interest cost 16 18 48 56
Expected return on plan assets (15) (16) (44) (49)
Amortization of net actuarial loss 1 2 5 5
Settlement (gain) loss [1] 0 0 2 (12)
Net periodic cost (credit) 6 8 21 11
Defined Benefit Plan, Plan Assets, Payment for Settlement     5 265
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost 0 1 1 3
Amortization of net actuarial loss 0 (5) 0 (14)
Amortization of prior service credit (6) (4) (18) (13)
Net periodic cost (credit) $ (6) $ (8) $ (17) $ (24)
[1] We made lump-sum settlement payments using plan assets of $5 million and $265 million for the nine months ended July 1, 2017 and July 2, 2016, respectively, to certain deferred vested participants within our qualified pension plans.