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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   $ 135 $ 124 $ 204
Interest cost   229 217 188
Expected return on plan assets   (276) (251) (306)
Amortization of unrecognized actuarial (gain) loss   19 8 120
Amortization of prior service (credits) cost   0 1 0
Other   1 3 5
Net periodic benefit cost (credit)   108 102 211
Pension Benefits | Forecast        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit cost (credit) $ 91      
Other Postretirement Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   5 4 9
Interest cost   38 42 30
Expected return on plan assets   (1) (1) (1)
Amortization of unrecognized actuarial (gain) loss   (26) (38) (14)
Amortization of prior service (credits) cost   (93) (112) (112)
Other   0 0 0
Net periodic benefit cost (credit)   $ (77) $ (105) $ (88)
Other Postretirement Benefits | Forecast        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit cost (credit) $ (81)