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Employee Benefit Plans
9 Months Ended
Sep. 30, 2025
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
2025202420252024
Three months ended September 30
Service cost$27 $28 $— $
Interest cost34 31 
Expected return on plan assets(56)(54)— — 
Amortization of:
Net actuarial gain(2)(1)(2)(1)
Prior service cost (credit)(3)— 
Settlement loss— — 
Net periodic benefit cost$$$$
Nine months ended September 30
Service cost$81 $84 $$
Interest cost102 94 
Expected return on plan assets(167)(161)— — 
Amortization of:
Net actuarial gain(6)(4)(6)(3)
Prior service cost (credit)(8)— 
Settlement loss— — 
Net periodic benefit cost$20 $10 $$

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.”