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Pension Plans, Retirement Benefits and Savings Plans
3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Pension Plans, Retirement Benefits and Savings Plans PENSION PLANS, RETIREMENT BENEFITS AND SAVINGS PLANS
 
The following table summarizes the components of net periodic benefit cost (benefit) for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income for the three months ended March 31, 2023 and 2022.
 Pension PlansPostretirement Benefit Plans
(for the three months ended March 31, in millions)2023202220232022
Net Periodic Benefit Cost (Benefit):    
Service cost$27 $36 $ $— 
Non-service cost (benefit):    
Interest cost on benefit obligation$44 $25 $1 $
Expected return on plan assets(78)(74) — 
Amortization of unrecognized:
Prior service benefit — (1)(1)
Net actuarial (gain) loss  12 (2)(1)
Total non-service cost (benefit)(34)(37)(2)(1)
Net periodic benefit cost (benefit)$(7)$(1)$(2)$(1)
 
The following table indicates the line items in which the respective service cost and non-service cost (benefit) are presented in the consolidated statement of income for the three months ended March 31, 2023 and 2022.
 
 Pension PlansPostretirement Benefit Plans
(for the three months ended March 31, in millions)2023202220232022
Service Cost:    
Claims and claim adjustment expenses$11 $15 $ $— 
General and administrative expenses16 21  — 
Total service cost27 36  — 
Non-Service Cost (Benefit):    
Claims and claim adjustment expenses(14)(15)(1)— 
General and administrative expenses(20)(22)(1)(1)
Total non-service cost (benefit)(34)(37)(2)(1)
Net periodic benefit cost (benefit)$(7)$(1)$(2)$(1)