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FAIR VALUE MEASUREMENTS - Levels Within the Fair Value Hierarchy for Postretirement Benefit Plan Assets (Details) - Other Postretirement Benefit Plans - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | $ 176 | $ 373 | $ 419
Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 10 | 43 |
Equity Securities, US based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 73 | 133 |
Equity Securities, International based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 4 | 4 |
Government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 14 | 12 |
Corporate bonds and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 7 | 71 |
Mutual, pooled and commingled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 39 | 86 |
Hedge funds/limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 18 | 14 |
Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 6 | 6 |
Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 5 | 4 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 83 | 172 |
Level 1 | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 6 | 35 |
Level 1 | Equity Securities, US based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 73 | 133 |
Level 1 | Equity Securities, International based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 4 | 4 |
Level 1 | Government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 1 | Corporate bonds and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 1 | Mutual, pooled and commingled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 1 | Hedge funds/limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 1 | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 1 | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 62 | 174 |
Level 2 | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 4 | 8 |
Level 2 | Equity Securities, US based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 2 | Equity Securities, International based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 2 | Government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 14 | 12 |
Level 2 | Corporate bonds and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 7 | 71 |
Level 2 | Mutual, pooled and commingled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 37 | 83 |
Level 2 | Hedge funds/limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 2 | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Level 2 | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 31 | 27 |
Other | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other | Equity Securities, US based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other | Equity Securities, International based companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other | Government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other | Corporate bonds and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 0 | 0 |
Other | Mutual, pooled and commingled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 2 | 3 |
Other | Hedge funds/limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 18 | 14 |
Other | Real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | 6 | 6 |
Other | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Plan Assets | $ 5 | $ 4 |

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