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Pensions and Other Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
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 first quarters of 2019 and 2018 include the following components:
 
 
 
Retirement Plans
 
Other Benefit Plans
(Dollars in Millions)
 
 
March 31, 2019
 
April 1, 2018
 
March 31, 2019
 
April 1, 2018
Service cost
 
 
276

 
309

 
68

 
67

Interest cost
 
 
275

 
252

 
46

 
37

Expected return on plan assets
 
 
(583
)
 
(560
)
 
(2
)
 
(2
)
Amortization of prior service cost/(credit)
 
 
1

 
1

 
(8
)
 
(8
)
Recognized actuarial losses
 
 
144

 
215

 
32

 
30

Curtailments and settlements
 
 
(1
)
 
(2
)
 
—

 
—

Net periodic benefit cost
 
 
112

 
215

 
136

 
124