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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Jun. 27, 2020
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 27, 2020, and June 29, 2019, are as follows (in millions):
 
Pension Plans
 
Three Months Ended
 
Nine Months Ended
 
June 27, 2020
 
June 29, 2019
 
June 27, 2020
 
June 29, 2019
 
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
1

Interest cost
2

 
16

 
19

 
48

Expected return on plan assets
—

 
(14
)
 
(15
)
 
(43
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
1

 
—

 
3

 
1

Prior service cost
1

 
1

 
1

 
1

Settlement (gain) loss
(6
)
 
—

 
(112
)
 
19

Net periodic cost (credit)
$
(2
)
 
$
3

 
$
(104
)
 
$
27

 
Postretirement Benefit Plans
 
Three Months Ended
 
Nine Months Ended
 
June 27, 2020
 
June 29, 2019
 
June 27, 2020
 
June 29, 2019
 
 
 
 
 
 
 
 
Interest cost
$
1

 
$
—

 
$
1

 
$
1

Amortization of prior service cost (credit)
—

 
(1
)
 
(1
)
 
(6
)
Net periodic cost (credit)
$
1

 
$
(1
)
 
$
—

 
$
(5
)