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RETIREMENT BENEFITS - Schedule of Defined Benefit Plans - Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
OPEB        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost $ 5 $ 5 $ 10 $ 10
Interest cost 49 55 99 110
Expected return on assets 0 0 0 0
Amortization of prior service costs/(credits) 3 2 5 4
Net remeasurement (gain)/loss 0 0 0 0
Separation costs/other 0 0 0 0
Settlements and curtailments 0 0 0 0
Net periodic benefit cost/(income) 57 62 114 124
U.S. Plans | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost 53 52 106 104
Interest cost 353 393 706 786
Expected return on assets (449) (457) (898) (913)
Amortization of prior service costs/(credits) 22 22 44 44
Net remeasurement (gain)/loss 0 0 0 0
Separation costs/other 0 5 0 12
Settlements and curtailments 0 0 0 0
Net periodic benefit cost/(income) (21) 15 (42) 33
Non-U.S. Plans | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost 40 50 84 98
Interest cost 252 238 500 462
Expected return on assets (293) (289) (588) (567)
Amortization of prior service costs/(credits) 6 6 12 12
Net remeasurement (gain)/loss 54 0 (189) (10)
Separation costs/other 10 11 63 35
Settlements and curtailments 4 0 19 0
Net periodic benefit cost/(income) $ 73 $ 16 $ (99) $ 30