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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 ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value |  |  |
Private equity funds | $ 863,000,000 | $ 780,000,000 | $ 670,000,000
Valued at NAV | 87,000,000 | 464,000,000 |
Level 1 |  |  |
Fair Value |  |  |
Private equity funds | 43,000,000 | 239,000,000 |
Level 2 |  |  |
Fair Value |  |  |
Private equity funds | 732,000,000 | 58,000,000 |
Level 3 |  |  |
Fair Value |  |  |
Private equity funds | 1,000,000 | 19,000,000 |
United States | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 113,000,000 | 167,000,000 |
Valued at NAV | 87,000,000 | 82,000,000 |
United States | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 2,000,000 |
Valued at NAV |  | 0 |
United States | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 143,000,000 | 198,000,000 |
Valued at NAV | 0 | 124,000,000 |
United States | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 214,000,000 | 151,000,000 |
Valued at NAV | 0 | 148,000,000 |
United States | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds | 292,000,000 | 4,000,000 |
Valued at NAV | 0 | 0 |
United States | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds |  | 2,000,000 |
Valued at NAV |  | 0 |
United States | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 26,000,000 | 85,000,000 |
United States | Level 1 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
United States | Level 1 | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 74,000,000 |
United States | Level 1 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
United States | Level 1 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
United States | Level 1 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds |  | 2,000,000 |
United States | Level 2 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
United States | Level 2 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
United States | Level 2 | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 143,000,000 | 0 |
United States | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 214,000,000 | 3,000,000 |
United States | Level 2 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds | 292,000,000 | 4,000,000 |
United States | Level 2 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
United States | Level 3 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
United States | Level 3 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds |  | 2,000,000 |
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 | Common Collective Trust Fund – United States |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
United States | Level 3 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
International | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 15,000,000 | 157,000,000 |
Valued at NAV | 0 | 110,000,000 |
International | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds | 1,000,000 | 17,000,000 |
Valued at NAV | 0 | 0 |
International | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 23,000,000 | 1,000,000 |
Valued at NAV | 0 | 0 |
International | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 46,000,000 | 67,000,000 |
Valued at NAV | 0 | 0 |
International | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds | 14,000,000 | 12,000,000 |
Valued at NAV | 0 | 0 |
International | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 2,000,000 |
Valued at NAV | 0 | 0 |
International | Level 1 | Common and Preferred Stocks: |  |  |
Fair Value |  |  |
Private equity funds | 15,000,000 | 47,000,000 |
International | Level 1 | Private Equity and Hedge Funds – International |  |  |
Fair Value |  |  |
Private equity funds | 0 | 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 | 29,000,000 |
International | Level 1 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 1 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 2,000,000 |
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 | 0 |
International | Level 2 | Corporate Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 23,000,000 | 1,000,000 |
International | Level 2 | Government and Other Debt Securities: |  |  |
Fair Value |  |  |
Private equity funds | 46,000,000 | 38,000,000 |
International | Level 2 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds | 14,000,000 | 12,000,000 |
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 | 1,000,000 | 17,000,000 |
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 | Buy-in Annuity - International |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
International | Level 3 | Short-Term and Other Investments – International |  |  |
Fair Value |  |  |
Private equity funds | $ 0 | $ 0 |

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