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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jul. 01, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Net periodic benefit cost for the Company’s defined benefit retirement plans and other benefit plans for the fiscal second quarters and fiscal six months of 2018 and 2017 include the following components:
 
 
Fiscal Second Quarters Ended
 
Fiscal Six Months Ended
 
 
Retirement Plans
 
Other Benefit Plans
 
Retirement Plans
 
Other Benefit Plans
(Dollars in Millions)
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
Service cost
 
$
309

 
255

 
68

 
62

 
618

 
506

 
135

 
123

Interest cost
 
249

 
231

 
38

 
40

 
501

 
461

 
75

 
79

Expected return on plan assets
 
(554
)
 
(509
)
 
(2
)
 
(1
)
 
(1,114
)
 
(1,014
)
 
(4
)
 
(3
)
Amortization of prior service cost/(credit)
 
—

 
1

 
(8
)
 
(8
)
 
1

 
1

 
(16
)
 
(15
)
Recognized actuarial losses
 
213

 
150

 
31

 
35

 
428

 
302

 
61

 
69

Curtailments and settlements
 
—

 
(1
)
 
—

 
—

 
(2
)
 
(1
)
 
—

 
—

Net periodic benefit cost
 
$
217

 
127

 
127

 
128

 
432

 
255

 
251

 
253