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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Assets at Fair Value by Level within the Fair Value Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Private equity funds |  | $ 78
Short-term and other investments: |  |
Fair Value |  |
Private equity funds | $ 90 |
Level 1 |  |
Fair Value |  |
Private equity funds |  | 29
Level 1 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 32 |
Level 2 |  |
Fair Value |  |
Private equity funds |  | 37
Level 2 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 46 |
Level 3 |  |
Fair Value |  |
Private equity funds |  | 12
Level 3 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 12 |
United States | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 17 | 15
United States | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 4 | 3
United States | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 1 | 2
United States | Real estate: |  |
Fair Value |  |
Private equity funds | 3 | 3
United States | Level 1 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 17 | 15
United States | Level 1 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 1 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 1 | Real estate: |  |
Fair Value |  |
Private equity funds | 3 | 3
United States | Level 2 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 2 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 4 | 3
United States | Level 2 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 1 | 2
United States | Level 2 | Real estate: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 3 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 3 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 3 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
United States | Level 3 | Real estate: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 8 | 8
International | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 14 | 3
International | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 7 | 22
International | Real estate: |  |
Fair Value |  |
Private equity funds | 14 | 14
International | Buy-in annuity: |  |
Fair Value |  |
Private equity funds | 3 |
International | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 19 | 8
International | Level 1 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 8 | 8
International | Level 1 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 1 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 1 | Real estate: |  |
Fair Value |  |
Private equity funds | 2 | 2
International | Level 1 | Buy-in annuity: |  |
Fair Value |  |
Private equity funds | 0 |
International | Level 1 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 2 | 1
International | Level 2 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 2 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 14 | 3
International | Level 2 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 7 | 22
International | Level 2 | Real estate: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 2 | Buy-in annuity: |  |
Fair Value |  |
Private equity funds | 3 |
International | Level 2 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | 17 | 7
International | Level 3 | Common and preferred stocks: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 3 | Corporate debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 3 | Government and other debt securities: |  |
Fair Value |  |
Private equity funds | 0 | 0
International | Level 3 | Real estate: |  |
Fair Value |  |
Private equity funds | 12 | 12
International | Level 3 | Buy-in annuity: |  |
Fair Value |  |
Private equity funds | 0 |
International | Level 3 | Short-term and other investments: |  |
Fair Value |  |
Private equity funds | $ 0 | $ 0

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