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EMPLOYEE BENEFIT PLANS - Fair Value Category as of Measurement Date for Defined Benefit Plan (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 554,000,000 | $ 322,000,000 | $ 413,000,000
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 16,000,000 | 17,000,000 | $ 24,000,000
Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 219,000,000 | 0 |
Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 219,000,000 | 0 |
Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 335,000,000 | 322,000,000 |
Equity securities | Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 65,000,000 |  |
Equity securities | Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Equity securities | Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Equity securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 65,000,000 |  |
Equity securities | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 109,000,000 | 100,000,000 |
Cash and money market funds | Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 9,000,000 |  |
Cash and money market funds | Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Cash and money market funds | Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Cash and money market funds | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 9,000,000 |  |
Real Estate Funds | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 17,000,000 | 26,000,000 |
Government obligations | Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45,000,000 |  |
Government obligations | Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Government obligations | Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Government obligations | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45,000,000 |  |
Government obligations | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 60,000,000 | 57,000,000 |
Corporate obligations | Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 100,000,000 |  |
Corporate obligations | Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Corporate obligations | Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Corporate obligations | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 100,000,000 |  |
Corporate obligations | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 114,000,000 | 102,000,000 |
Short-term Investments | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6,000,000 | 6,000,000 |
Other Investments | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded capital commitments | 0 | 0 |
Other Investments | Fair Value, Inputs, Level 1 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Other Investments | Fair Value, Inputs, Level 2 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Other Investments | Fair Value, Inputs, Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Other Investments | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Other Investments | Fair Value Measured at Net Asset Value Per Share | Retirement Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 29,000,000 | $ 31,000,000 |

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