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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following summarizes the components of net periodic benefit costs:
Three Months Ended 
March 31,
(In millions)20222021
Pension Benefits
Service cost$68 $76 
Interest cost23 23 
Expected return on plan assets(41)(33)
Amortization – prior service credit(11)(11)
                      – actuarial loss4 11 
                      – settlement loss2 — 
Net periodic pension benefit cost$45 $66 
Other Benefits
Service cost$8 $10 
Interest cost5 7 
Amortization – prior service cost (credit)(5)1 
                      – actuarial loss2 2 
Net periodic other benefit cost$10 $20