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Retirement Benefits
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
Components of Net Periodic Benefit (Credits) Costs
See Note 1 — Basis of Presentation of our 2023 10-K for additional information on where we report the service cost and other non-service cost (credit) components for all plans.
The following tables present the components of our net periodic benefit (credits) costs, prior to capitalization and co-owner allocations, for the three months ended March 31, 2024 and 2023:
Pension BenefitsOPEBTotal Pension Benefits and OPEB
Three Months Ended March 31,Three Months Ended March 31,Three Months Ended March 31,
202420232024202320242023
Components of net periodic benefit (credit) cost:
Service cost$22 $22 $4 $4 $26 $26 
Non-service components of pension benefits & OPEB (credit) cost:
Interest cost95 99 18 18 113 117 
Expected return on assets(124)(127)(11)(11)(135)(138)
Amortization of:
Prior service (credit) cost
— — (2)(2)(2)(2)
Actuarial (gain) loss
25 12 (2)(3)23 9 
Settlement charges3 — — — 3 — 
Non-service components of pension benefits & OPEB (credit) cost(1)(16)3 2 2 (14)
Net periodic benefit (credit) cost(a)
$21 $6 $7 $6 $28 $12 
__________
(a)The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2024 and 2023 totaled $24 million in both periods.