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RETIREMENT PLANS - Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Benefit Obligation      
Accumulated benefit obligation $ 120 $ 122  
Projected benefit obligation at beginning of year 122 131  
Interest cost 6 6 $ 7
Actuarial loss (gain) 4 (4)  
Benefits paid (12) (11)  
Projected benefit obligation at end of year 120 122 131
Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 184 178  
Actual return on plan assets 20 15  
Corporation contribution 3 2  
Benefits paid (12) (11)  
Fair value of plan assets at end of year 195 184 178
Funded status of plans 75 62  
Qualified Pension Plans      
Benefit Obligation      
Accumulated benefit obligation 107 108  
Projected benefit obligation at beginning of year 108 116  
Interest cost 5 5  
Actuarial loss (gain) 3 (4)  
Benefits paid (9) (9)  
Projected benefit obligation at end of year 107 108 116
Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 184 178  
Actual return on plan assets 20 15  
Corporation contribution 0 0  
Benefits paid (9) (9)  
Fair value of plan assets at end of year 195 184 178
Funded status of plans 88 76  
Non Qualified Pension Plans      
Benefit Obligation      
Accumulated benefit obligation 13 14  
Projected benefit obligation at beginning of year 14 15  
Interest cost 1 1  
Actuarial loss (gain) 1 0  
Benefits paid (3) (2)  
Projected benefit obligation at end of year 13 14 15
Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Corporation contribution 3 2  
Benefits paid (3) (2)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status of plans $ (13) $ (14)