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PENSION - Plan Assets That Use Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 1,650 $ 1,617
Ending balance 1,466 1,650
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 1,383 0
Purchase of insurance contracts   1,422
Return on assets (94) (27)
Payments from insurance policy (86) (12)
Ending balance $ 1,203 $ 1,383