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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 02, 2016
Jun. 27, 2015
Jul. 02, 2016
Jun. 27, 2015
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 4 $ 5 $ 11 $ 13
Interest cost 18 21 56 63
Expected return on plan assets (16) (25) (49) (75)
Amortization of net actuarial (gain) loss 2 1 5 4
Settlement (gain) loss 0 0 (12) [1] 8 [1]
Net periodic cost (credit) 8 2 11 13
Other Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 2 0 4
Interest cost 1 2 3 5
Amortization of net actuarial (gain) loss (5) 6 (14) 6
Amortization of prior service credit (4) 0 (13) 0
Net periodic cost (credit) $ (8) $ 10 $ (24) $ 15
[1] We made lump-sum settlement payments using plan assets of $265 million and $18 million for the nine months ended July 2, 2016, and June 27, 2015, respectively, to certain deferred vested participants within our qualified pension plans.