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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2025
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
September 30,		Nine Months Ended
September 30,
(In millions)2025202420252024
Service cost$7 $7 $21 $21 
Interest cost53 54 158 163 
Expected return on plan assets(79)(80)(238)(240)
Amortization:
Prior service costs4 5 13 13 
Net actuarial gain(2)— (6)— 
Net periodic benefit credits$(17)$(14)$(52)$(43)
OPEB COSTS (CREDITS)
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2025202420252024
Service cost$2 $2 $6 $6 
Interest cost14 13 43 38 
Expected return on plan assets(11)(11)(32)(32)
Termination benefits1
— — 15 2 
Amortization:
Prior service credits(3)(4)(10)(12)
Net actuarial gain(33)(39)(100)(116)
Net periodic benefit credits$(31)$(39)$(78)$(114)
1 The termination benefits relate to the decision to indefinitely idle our Conshohocken, Riverdale and Steelton facilities in the second quarter of 2025 and the indefinite idle of our Weirton tinplate production facility in the first quarter of 2024.