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PENSION - Plan Assets That Use Unobservable Inputs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Beginning balance $ 1,617
Ending balance 1,650
Level 3  
Defined Benefit Plan Disclosure [Line Items]  
Beginning balance 0
Purchase of insurance contracts 1,422
Return on assets (27)
Payments from insurance policy (12)
Ending balance $ 1,383