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Pension Plans, Retirement Benefits and Savings Plans
 3 Months Ended
Mar. 31, 2024
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, 2024 and 2023.
 Pension PlansPostretirement Benefit Plans
(for the three months ended March 31, in millions)2024202320242023
Net Periodic Benefit Cost (Benefit):    
Service cost$29 $27 $— $— 
Non-service cost (benefit):    
Interest cost on benefit obligation43 44 1 1 
Expected return on plan assets(75)(78)— — 
Amortization of unrecognized:
Prior service benefit— — (1)(1)
Net actuarial (gain) loss 2 — (2)(2)
Total non-service cost (benefit)(30)(34)(2)(2)
Net periodic benefit cost (benefit)$(1)$(7)$(2)$(2)
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, 2024 and 2023.
 
 Pension PlansPostretirement Benefit Plans
(for the three months ended March 31, in millions)2024202320242023
Service Cost:    
Claims and claim adjustment expenses$11 $11 $— $— 
General and administrative expenses18 16 — — 
Total service cost29 27 — — 
Non-Service Cost (Benefit):    
Claims and claim adjustment expenses(12)(14)(1)(1)
General and administrative expenses(18)(20)(1)(1)
Total non-service cost (benefit)(30)(34)(2)(2)
Net periodic benefit cost (benefit)$(1)$(7)$(2)$(2)