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RETIREMENT BENEFITS PLANS - Change in Plan Level 3 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]    
Beginning balance $ 3,993  
Ending balance 4,191 $ 3,993
Unobservable inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 486  
Ending balance 485 486
Unobservable inputs (Level 3) | Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 124  
Ending balance 116 124
Unobservable inputs (Level 3) | Other    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 362  
Ending balance 369 362
Pension plans | Unobservable inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 486 569
Gains (losses) relating to assets still held at year-end 46 5
Purchases, sales, settlements - net (47) (88)
Transfers into or out of Level 3 0 0
Ending balance 485 486
Pension plans | Unobservable inputs (Level 3) | Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 124 199
Gains (losses) relating to assets still held at year-end 14 (24)
Purchases, sales, settlements - net (22) (51)
Transfers into or out of Level 3 0 0
Ending balance 116 124
Pension plans | Unobservable inputs (Level 3) | Other    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 362 370
Gains (losses) relating to assets still held at year-end 32 29
Purchases, sales, settlements - net (25) (37)
Transfers into or out of Level 3 0 0
Ending balance $ 369 $ 362