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EMPLOYEE BENEFIT PLANS - Net Periodic Cost/(Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Defined Benefit Plan Disclosure      
Service cost $ 233 $ 95 $ 0
Interest cost 820 855 611
Expected return on plan assets (1,062) (1,060) (1,319)
Amortization of prior service credit 0 0 0
Recognized net actuarial loss 248 240 255
Special termination benefits 0 0 0
Net periodic cost/(benefit) 239 130 (453)
Other Postretirement and Postemployment Benefits      
Defined Benefit Plan Disclosure      
Service cost 92 71 70
Interest cost 182 200 128
Expected return on plan assets (2) (1) (17)
Amortization of prior service credit (4) (5) (5)
Recognized net actuarial loss 18 14 56
Special termination benefits 5 0 0
Net periodic cost/(benefit) $ 291 $ 279 $ 232