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Benefit Plans
 6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees.

The following tables present the components of net periodic (benefit) cost for the defined benefit plans:

Pension Benefits
Three Months EndedSix Months Ended
June 30,June 30,
2023202220232022
(In millions)
Service cost$1 $1 
Interest cost$28 $18 56 37 
Expected return on plan assets(32)(40)(64)(83)
Amortization of unrecognized net loss9 8 18 16 
Settlements1 1 1 2 
Regulatory asset decrease1 2 
Net periodic (benefit) cost$6 $(12)$12 $(25)

Other Postretirement Benefits
Three Months EndedSix Months Ended
June 30,June 30,
2023202220232022
(In millions)
Interest cost$1 $1 $1 
Expected return on plan assets(1)(1)(1)
Net periodic benefit$— $— $— $—