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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Apr. 02, 2016
Mar. 28, 2015
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 3 $ 4 $ 7 $ 8
Interest cost 18 21 38 42
Expected return on plan assets (16) (25) (33) (50)
Amortization of net actuarial (gain) loss 2 2 3 3
Settlement (gain) loss 0 0 (12) [1] 8 [1]
Net periodic cost (credit) 7 2 3 11
Other Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0 1 0 2
Interest cost 1 1 2 3
Amortization of net actuarial (gain) loss (9) 0 (9) 0
Amortization of prior service credit (5) 0 (9) 0
Net periodic cost (credit) $ (13) $ 2 $ (16) $ 5
[1] We made lump-sum settlement payments using plan assets of $265 million and $18 million for the six months ended April 2, 2016, and March 28, 2015, respectively, to certain deferred vested participants within our qualified pension plans.