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EMPLOYEE RETIREMENT PLANS - Assumptions - General Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended | 120 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Private Equity And Hedge Funds [Member] |  |  |  |
Assumptions |  |  |  |
Private equity funds | $ 19 | $ 93 |  | $ 19
Defined-benefit pension plans |  |  |  |
Assumptions |  |  |  |
Discount rate for obligations (as a percent) | 2.50% | 3.80% | 3.30% | 2.50%
Expected return on plan assets (as a percent) | 3.00% | 7.00% | 7.25% |
Actual annual rate of return on pension plan assets (as a percent) | 17.70% | 4.90% | 13.90% | 7.40%
Defined-benefit pension plans | Equity securities |  |  |  |
Assumptions |  |  |  |
Asset allocation (as a percent) | 30.00% |  |  | 30.00%
Defined-benefit pension plans | Debt securities |  |  |  |
Assumptions |  |  |  |
Asset allocation (as a percent) | 65.00% |  |  | 65.00%
Defined-benefit pension plans | Alternative investments |  |  |  |
Assumptions |  |  |  |
Asset allocation (as a percent) | 5.00% |  |  | 5.00%
Defined-benefit pension plans | Minimum |  |  |  |
Assumptions |  |  |  |
Discount rate for obligations (as a percent) | 1.10% | 1.50% | 1.50% | 1.10%
Liabilities having a discount rate for obligations (as a percent) | 2.40% | 4.10% | 3.40% | 2.40%
Defined-benefit pension plans | Maximum |  |  |  |
Assumptions |  |  |  |
Discount rate for obligations (as a percent) | 3.00% | 4.20% | 3.60% | 3.00%
Foreign Plan [Member] | Defined-benefit pension plans |  |  |  |
Assumptions |  |  |  |
Expected return on plan assets (as a percent) | 3.90% |  |  |

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