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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Mar. 30, 2019
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 six months ended March 30, 2019, and March 31, 2018, are as follows (in millions):
 
Pension Plans
 
Three Months Ended
 
Six Months Ended
 
March 30, 2019
 
March 31, 2018
 
March 30, 2019
 
March 31, 2018
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
2

 
$
1

 
$
4

Interest cost
16

 
16

 
32

 
32

Expected return on plan assets
(15
)
 
(15
)
 
(29
)
 
(31
)
Amortization of net actuarial loss
1

 
1

 
1

 
2

Settlement loss
—

 
—

 
19

 
—

Net periodic cost
$
2

 
$
4

 
$
24

 
$
7

 
Postretirement Benefit Plans
 
Three Months Ended
 
Six Months Ended
 
March 30, 2019
 
March 31, 2018
 
March 30, 2019
 
March 31, 2018
 
 
 
 
 
 
 
 
Interest cost
$
1

 
$
1

 
$
1

 
$
1

Amortization of prior service credit
(1
)
 
(6
)
 
(5
)
 
(12
)
Net periodic credit
$
—

 
$
(5
)
 
$
(4
)
 
$
(11
)