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Pensions and Other Benefit Plans (Tables)
 6 Months Ended
Jun. 28, 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 second quarters and fiscal six months of 2020 and 2019 include the following components:
 Retirement PlansOther Benefit PlansRetirement PlansOther Benefit Plans
(Dollars in Millions)June 28, 2020June 30, 2019June 28, 2020June 30, 2019June 28, 2020June 30, 2019June 28, 2020June 30, 2019
Service cost$323  277  72  69  649  553  144  137  
Interest cost237  274  33  46  477  549  66  92  
Expected return on plan assets(608) (581) (1) (1) (1,222) (1,164) (3) (3) 
Amortization of prior service cost/(credit)1  1  (8) (8) 1  2  (16) (16) 
Recognized actuarial losses222  146  35  33  445  290  71  65  
Curtailments and settlements—  8  —  —  19  7  —  —  
Net periodic benefit cost$175  125  131  139  369  237  262  275