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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
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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) |  |  |

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