v3.25.4
RETIREMENT BENEFITS - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
U.S.    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year $ 9,849  
Plan assets at fair value at year end 9,941 $ 9,849
U.S. | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 4 5
Realized (losses) 0 0
Unrealized gains (losses) 0 1
Purchases, sales, and issuances 0 (2)
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 4 4
U.S. | Annuity contracts | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 3 3
Realized (losses) 0 0
Unrealized gains (losses) 0 0
Purchases, sales, and issuances 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 3 3
U.S. | Other investments | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 1 2
Realized (losses) 0 0
Unrealized gains (losses) 0 1
Purchases, sales, and issuances 0 (2)
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 1 1
Non-U.S.    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 7,013  
Plan assets at fair value at year end 8,382 7,013
Non-U.S. | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 240 235
Unrealized gains (losses) 16 2
Purchases, sales, and issuances 126 3
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 382 240
Non-U.S. | Real assets(1) | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 2 2
Unrealized gains (losses) 0 0
Purchases, sales, and issuances 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 2 2
Non-U.S. | Annuity contracts | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 2 2
Unrealized gains (losses) 0 0
Purchases, sales, and issuances 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 2 2
Non-U.S. | Other investments | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 236 231
Unrealized gains (losses) 16 2
Purchases, sales, and issuances 126 3
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end $ 378 $ 236