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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Assets at Fair Value by Level within the Fair Value Hierarchy (Details) - Qualified - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value |  |  |
Private equity funds | $ 78 | $ 99 | $ 863
Level 1 |  |  |
Fair Value |  |  |
Private equity funds | 29 | 46 |
Level 2 |  |  |
Fair Value |  |  |
Private equity funds | 37 | 47 |
Level 3 |  |  |
Fair Value |  |  |
Private equity funds | 12 | 6 |
United States | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 15 | 25 |
United States | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 3 | 5 |
United States | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 2 | 4 |
United States | Real Estate: |  |  |
Fair Value |  |  |
Private equity funds | 3 | 3 |
United States | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 15 | 25 |
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 | 3 | 5 |
United States | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 2 | 4 |
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 | 13 |
International | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 3 | 2 |
International | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 22 | 36 |
International | Real Estate: |  |  |
Fair Value |  |  |
Private equity funds | 14 | 8 |
International | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 8 | 3 |
International | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 8 | 13 |
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 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 1 | 3 |
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 | 3 | 2 |
International | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 22 | 36 |
International | Level 2 | Real Estate: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 2 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 7 | 0 |
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 | 6 |
International | Level 3 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | $ 0 | $ 0 |

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