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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS
7.    EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
Pension PlansOther Postretirement
Benefit Plans
2024202320242023
Three months ended March 31
Service cost$28 $28 $1 $1 
Interest cost31 30 3 3 
Expected return on plan assets(53)(50)— — 
Amortization of:
Net actuarial gain(1)(2)(1)(1)
Prior service credit(3)(5)— (1)
Net periodic benefit cost$2 $1 $3 $2 

The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net.”