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Postretirement Benefit Plans (Tables)
 6 Months Ended
Dec. 28, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The following tables provide the components of our net periodic benefit income for our defined benefit plans, including defined benefit pension plans and other postretirement defined benefit plans:
 
Quarter Ended December 28, 2018
 
Two Quarters Ended December 28, 2018
 
Pension
 
Other Benefits
 
Pension
 
Other Benefits
 
 
 
 
 
 
 
 
 
(In millions)
Net periodic benefit income
 
 
 
 
 
 
 
Service cost
$
9

 
$
—

 
$
18

 
$
—

Interest cost
53

 
2

 
105

 
4

Expected return on plan assets
(96
)
 
(4
)
 
(191
)
 
(8
)
Amortization of net actuarial gain
—

 
(1
)
 
—

 
(3
)
Total net periodic benefit income
$
(34
)
 
$
(3
)
 
$
(68
)
 
$
(7
)

 
Quarter Ended December 29, 2017
 
Two Quarters Ended December 29, 2017
 
Pension
 
Other Benefits
 
Pension
 
Other Benefits
 
 
 
 
 
 
 
 
 
(In millions)
Net periodic benefit income
 
 
 
 
 
 
 
Service cost
$
9

 
$
1

 
$
19

 
$
1

Interest cost
49

 
2

 
97

 
4

Expected return on plan assets
(92
)
 
(4
)
 
(184
)
 
(8
)
Amortization of net actuarial gain
—

 
(1
)
 
—

 
(1
)
Total net periodic benefit income
$
(34
)
 
$
(2
)
 
$
(68
)
 
$
(4
)