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RETIREMENT BENEFITS - Schedule of Defined Benefit Pension Plan Assets Measured at Fair Value on Recurring Basis (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
U.S. Plans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at January 1 $ 29,502 $ 31,423
Return on plan assets Attributable to Assets Held at December 31 6 0
Return on plan assets Attributable to Assets Sold 0 3
Net Purchases/ (Settlements) 9 4
Transfers Into/(Out of) Level 3 (9) 1
Fair value of plan assets at December 31 30,005 29,502
U.S. Plans | Fair Value, Inputs, Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at January 1 29 21
Fair value of plan assets at December 31 35 29
Non-U.S. Plans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at January 1 21,751 22,958
Return on plan assets Attributable to Assets Held at December 31 6,278 (387)
Return on plan assets Attributable to Assets Sold 8 (16)
Net Purchases/ (Settlements) (33) (2)
Transfers Into/(Out of) Level 3 37 (168)
Fair value of plan assets at December 31 22,775 21,751
Non-U.S. Plans | Fair Value, Inputs, Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at January 1 3,565 4,138
Fair value of plan assets at December 31 9,855 3,565
United Kingdom And Germany    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at January 1 2,700  
Fair value of plan assets at December 31 $ 9,000 $ 2,700