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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 2026
Postemployment Benefits [Abstract]  
Schedule of Net Benefit Costs
The following are the components of defined benefit pension and OPEB costs (credits):
DEFINED BENEFIT PENSION COSTS (CREDITS)
Three Months Ended
March 31,
(In millions)20262025
Service cost$7 $
Interest cost45 53 
Expected return on plan assets(81)(79)
Amortization:
Prior service costs4 
Net actuarial gain(4)(2)
Net periodic benefit credits$(29)$(17)
OPEB COSTS (CREDITS)
Three Months Ended
March 31,
(In millions)20262025
Service cost$2 $
Interest cost14 14 
Expected return on plan assets(11)(11)
Amortization:
Prior service credits(3)(3)
Net actuarial gain(28)(33)
Net periodic benefit credits$(26)$(31)