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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS
8.    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
2026202520262025
Three months ended June 30
Service cost$27 $27 $1 $1 
Interest cost33 34 2 3 
Expected return on plan assets(57)(56)— — 
Amortization of:
Net actuarial gain(2)(2)(1)(2)
Prior service cost1 1 — — 
Settlement loss— 2 — — 
Net periodic benefit cost$2 $6 $2 $2 
Six months ended June 30
Service cost$54 $54 $2 $2 
Interest cost65 68 5 6 
Expected return on plan assets(115)(111)— — 
Amortization of:
Net actuarial gain(4)(4)(3)(4)
Prior service cost3 3 — — 
Settlement loss1 3 — — 
Net periodic benefit cost$4 $13 $4 $4 

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.”