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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2018
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 June 30, 2018, and July 1, 2017, are as follows (in millions):
 
Pension Plans
 
Three Months Ended
 
Nine Months Ended
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
 
 
 
 
 
 
 
 
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
—

 
—

 
—

 
2

Net periodic cost
$
2

 
$
6

 
$
9

 
$
21

 
Postretirement Benefit Plans
 
Three Months Ended
 
Nine Months Ended
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
 
 
 
 
 
 
 
 
Interest cost
$
—

 
$
—

 
$
1

 
$
1

Amortization of:
 
 
 
 
 
 
 
   Prior service credit
(6
)
 
(6
)
 
(18
)
 
(18
)
Net periodic cost (credit)
$
(6
)
 
$
(6
)
 
$
(17
)
 
$
(17
)