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PENSION - Plan Assets That Use Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 1,466 $ 1,650
Ending balance 1,521 1,466
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 1,203 1,383
Return on assets 132 (94)
Payments from insurance policy (91) (86)
Ending balance $ 1,244 $ 1,203