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Pensions and Other Benefit Plans (Tables)
 3 Months Ended
Mar. 29, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Net periodic benefit costs for the Company’s defined benefit retirement plans and other benefit plans for the fiscal first quarters of 2020 and 2019 include the following components:
 
 
Retirement Plans
 
Other Benefit Plans
(Dollars in Millions)
 
March 29, 2020
 
March 31, 2019
 
March 29, 2020
 
March 31, 2019
Service cost
 
$
326

 
276

 
72

 
68

Interest cost
 
240

 
275

 
33

 
46

Expected return on plan assets
 
(614
)
 
(583
)
 
(2
)
 
(2
)
Amortization of prior service cost/(credit)
 
—

 
1

 
(8
)
 
(8
)
Recognized actuarial losses
 
223

 
144

 
36

 
32

Curtailments and settlements
 
19

 
(1
)
 
—

 
—

Net periodic benefit cost
 
$
194

 
112

 
131

 
136