v3.25.4
PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS - Fair Value Measurement of Level 3 Pension Plan Assets (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]    
Fair value of plan assets at beginning of year $ 2,161 $ 2,424
Fair value of plan assets at end of year 1,865 2,161
Significant Other Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 543 603
Relating to assets held 45 (62)
Purchases, sales and settlements, net (89) (1)
Transfers into Level 3   3
Transfers out of Level 3 1 (23)  
Fair value of plan assets at end of year 476 543
Significant Other Unobservable Inputs (Level 3) | Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 75 79
Relating to assets held 15 (6)
Purchases, sales and settlements, net 0 2
Transfers into Level 3   0
Transfers out of Level 3 1 0  
Fair value of plan assets at end of year 90 75
Significant Other Unobservable Inputs (Level 3) | Insurance contracts    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 468 524
Relating to assets held 30 (56)
Purchases, sales and settlements, net (89) (3)
Transfers into Level 3   3
Transfers out of Level 3 1 (23)  
Fair value of plan assets at end of year $ 386 $ 468