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EMPLOYEE BENEFIT PLANS - Fair Value Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Investments measured at NAV |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 440 | $ 520 |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1,984 | 2,106 | $ 2,110
Pension Benefits | Qualified Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1,984 | 2,106 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1,544 | 1,586 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Corporate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 864 | 656 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | U.S. government, agencies and authorities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 95 | 367 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | States and political subdivisions |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 6 | 7 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Foreign governments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 14 | 15 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Common equity, REITs and preferred equity |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 439 | 416 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 2 | 14 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Collective Trust |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 67 | 72 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 17 | 12 |
Pension Benefits | Qualified Plan | Fair Value, Inputs, Level 1, 2 and 3 | Short-term investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 40 | 27 |
Pension Benefits | Qualified Plan | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 367 | 353 |
Pension Benefits | Qualified Plan | Level 1 | Corporate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 1 | U.S. government, agencies and authorities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 1 | States and political subdivisions |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 1 | Foreign governments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 1 | Common equity, REITs and preferred equity |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 348 | 327 |
Pension Benefits | Qualified Plan | Level 1 | Mutual funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 2 | 14 |
Pension Benefits | Qualified Plan | Level 1 | Collective Trust |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 17 | 12 |
Pension Benefits | Qualified Plan | Level 1 | Short-term investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1,177 | 1,233 |
Pension Benefits | Qualified Plan | Level 2 | Corporate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 864 | 656 |
Pension Benefits | Qualified Plan | Level 2 | U.S. government, agencies and authorities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 95 | 367 |
Pension Benefits | Qualified Plan | Level 2 | States and political subdivisions |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 6 | 7 |
Pension Benefits | Qualified Plan | Level 2 | Foreign governments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 14 | 15 |
Pension Benefits | Qualified Plan | Level 2 | Common equity, REITs and preferred equity |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 91 | 89 |
Pension Benefits | Qualified Plan | Level 2 | Mutual funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 2 | Collective Trust |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 67 | 72 |
Pension Benefits | Qualified Plan | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Qualified Plan | Level 2 | Short-term investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 40 | 27 |
Pension Benefits | Qualified Plan | Investments measured at NAV |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 440 | $ 520 |

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