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Employee Benefit Plans
 6 Months Ended
Jun. 30, 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 June 30
Service cost$28 $28 $1 $1 
Interest cost32 30 3 3 
Expected return on plan assets(54)(51)— — 
Amortization of:
Net actuarial gain(2)(1)(1)(2)
Prior service credit(2)(4)— (1)
Net periodic benefit cost$2 $2 $3 $1 
Six months ended June 30
Service cost$56 $56 $2 $2 
Interest cost63 60 6 6 
Expected return on plan assets(107)(101)— — 
Amortization of:
Net actuarial gain(3)(3)(2)(3)
Prior service credit(5)(9)— (2)
Net periodic benefit cost$4 $3 $6 $3 

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.”