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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Net Periodic (Benefit) Cost Components
The following table presents the components of net periodic (benefit) cost for the defined benefit plans:

Pension Benefits
Other Postretirement Benefits
Three Months Ended March 31
2022202120222021
(In millions)    
     
Service cost$1 $1 
Interest cost19 18 
Expected return on plan assets(43)(43)$(1)
Amortization of unrecognized net loss8 12 
Settlements1 
Regulatory asset decrease1 
Net periodic benefit$(13)$(12)$— $(1)