v3.25.4
RETIREMENT BENEFITS - Schedule Pre-Tax Net Periodic Benefit Cost/(Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
OPEB Worldwide      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 21 $ 24 $ 21
Interest cost 220 226 231
Expected return on assets 0 0 0
Amortization of prior service costs/(credits) 9 10 3
Net remeasurement (gain)/loss (19) (112) 286
Separation costs/other 0 0 1
Settlements and curtailments 0 0 0
Net periodic benefit cost/(income) 231 148 542
U.S. Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 209 288 292
Interest cost 1,571 1,581 1,641
Expected return on assets (1,826) (1,817) (1,897)
Amortization of prior service costs/(credits) 88 92 0
Net remeasurement (gain)/loss 308 444 841
Separation costs/other 30 22 20
Settlements and curtailments 0 129 69
Net periodic benefit cost/(income) 380 739 966
Non-U.S. Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 199 248 245
Interest cost 949 938 965
Expected return on assets (1,156) (1,019) (890)
Amortization of prior service costs/(credits) 25 25 22
Net remeasurement (gain)/loss 308 (1,019) 932
Separation costs/other 120 111 261
Settlements and curtailments 6 (22) 9
Net periodic benefit cost/(income) $ 451 $ (738) $ 1,544