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RETIREMENT BENEFITS PLANS - Change in Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension plans | United States      
Change in benefit obligations      
Balance at January 1 $ 2,700 $ 2,824  
Service cost 16 18 $ 19
Interest cost 135 134 142
Actuarial loss (gain) 55 (20)  
Gross benefits paid (256) (258)  
Currency translation 0 0  
Plan amendments 0 2  
Other 0 0  
Balance at December 31 2,650 2,700 2,824
Accumulated benefit obligation 2,650 2,686  
Pension plans | Non-United States plans      
Change in benefit obligations      
Balance at January 1 1,863 2,022  
Service cost 45 46 43
Interest cost 88 85 85
Actuarial loss (gain) 13 (82)  
Gross benefits paid (139) (121)  
Currency translation 155 (87)  
Plan amendments 10 (3)  
Other 3 3  
Balance at December 31 2,038 1,863 2,022
Accumulated benefit obligation 1,925 1,766  
Other postretirement benefits expense (income)      
Change in benefit obligations      
Balance at January 1 196 212  
Service cost 0 1 1
Interest cost 11 10 10
Actuarial loss (gain) 2 (11)  
Gross benefits paid (27) (29)  
Currency translation 1 (3)  
Plan amendments 0 0  
Other 11 16  
Balance at December 31 $ 194 $ 196 $ 212