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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Periodic Pension Cost
Net periodic pension cost (credit) includes the following components:
Qualified PlansNon-qualified PlansTotal
Three Months Ended June 30
202120202021202020212020
(In millions)
Service cost$10 $$$$12 $
Interest cost12 16 — 12 17 
Expected return on plan assets(36)(38)— — (36)(38)
Amortization of actuarial loss12 11 14 12 
Net periodic pension cost (credit)$(2)$(3)$$$$— 
Qualified PlansNon-qualified PlansTotal
Six Months Ended June 30
202120202021202020212020
(In millions)
Service cost$19 $17 $$$22 $19 
Interest cost24 32 25 34 
Expected return on plan assets(71)(75)— — (71)(75)
Amortization of actuarial loss23 20 27 23 
Net periodic pension cost (credit)$(5)$(6)$$$$