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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value |  |  |
Private equity funds | $ 99 | $ 863 | $ 780
Valued at NAV | 0 | 87 |
Level 1 |  |  |
Fair Value |  |  |
Private equity funds | 46 | 43 |
Level 2 |  |  |
Fair Value |  |  |
Private equity funds | 47 | 732 |
Level 3 |  |  |
Fair Value |  |  |
Private equity funds | 6 | 1 |
United States | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 25 | 113 |
Valued at NAV | 0 | 87 |
United States | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 5 | 143 |
Valued at NAV | 0 | 0 |
United States | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 4 | 214 |
Valued at NAV | 0 | 0 |
United States | Real Estate |  |  |
Fair Value |  |  |
Private equity funds | 3 |  |
Valued at NAV | 0 |  |
United States | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds |  | 292 |
Valued at NAV |  | 0 |
United States | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 25 | 26 |
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 |  |
United States | Level 1 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
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 | 5 | 143 |
United States | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 4 | 214 |
United States | Level 2 | Real Estate |  |  |
Fair Value |  |  |
Private equity funds | 0 |  |
United States | Level 2 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds |  | 292 |
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 |  |
United States | Level 3 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
International | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 13 | 15 |
Valued at NAV | 0 | 0 |
International | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 1 |
Valued at NAV |  | 0 |
International | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 2 | 23 |
Valued at NAV | 0 | 0 |
International | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 36 | 46 |
Valued at NAV | 0 | 0 |
International | Real Estate |  |  |
Fair Value |  |  |
Private equity funds | 8 |  |
Valued at NAV | 0 |  |
International | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds |  | 14 |
Valued at NAV |  | 0 |
International | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 3 | 2 |
Valued at NAV | 0 | 0 |
International | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 13 | 15 |
International | Level 1 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
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 |  |
International | Level 1 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
International | Level 1 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 3 | 2 |
International | Level 2 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 2 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
International | Level 2 | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 2 | 23 |
International | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 36 | 46 |
International | Level 2 | Real Estate |  |  |
Fair Value |  |  |
Private equity funds | 0 |  |
International | Level 2 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds |  | 14 |
International | Level 2 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 3 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 3 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 1 |
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 | 6 |  |
International | Level 3 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
International | Level 3 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | $ 0 | $ 0 |

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