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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Jul. 01, 2017
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of the net periodic cost for the pension and postretirement benefit plans for the three and nine months ended July 1, 2017, and July 2, 2016, are as follows (in millions):
 
Pension Plans
 
Three Months Ended
 
Nine Months Ended
 
July 1, 2017
 
July 2, 2016
 
July 1, 2017
 
July 2, 2016
 
 
 
 
 
 
 
 
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 (a)
—

 
—

 
2

 
(12
)
Net periodic cost
$
6

 
$
8

 
$
21

 
$
11

 
Postretirement Benefit Plans
 
Three Months Ended
 
Nine Months Ended
 
July 1, 2017
 
July 2, 2016
 
July 1, 2017
 
July 2, 2016
 
 
 
 
 
 
 
 
Interest cost
$
—

 
$
1

 
$
1

 
$
3

Amortization of:
 
 
 
 
 
 
 
   Net actuarial gain
—

 
(5
)
 
—

 
(14
)
   Prior service credit
(6
)
 
(4
)
 
(18
)
 
(13
)
Net periodic cost (credit)
$
(6
)
 
$
(8
)
 
$
(17
)
 
$
(24
)

(a) 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.