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Retirement Plans
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
Defined Benefit Pension Plans
The Company’s net periodic benefit costs for plans for the three months ended March 31, 2021 and 2020 were as follows:
 Three Months Ended March 31
(Dollars in millions)20212020
Service cost$$
Interest cost
Expected return on plan assets(1)(1)
Net periodic benefit cost$1 $1 
The service cost and amortization of prior service cost components are reported among employee compensation costs in the unaudited Condensed Consolidated Statements of Operations. The remaining components (interest cost, expected return on plan assets and amortization of actuarial loss) are reported in Other non-operating items, net in the unaudited Condensed Consolidated Statements of Operations.