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EMPLOYEE RETIREMENT PLANS - Defined-benefit Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Qualified |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 780 | $ 670 | $ 695
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 1,019 | 882 |
Accumulated benefit obligation | 1,019 | 882 |
Fair value of plan assets | 763 | 655 |
Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | $ 0
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 161 | 155 |
Accumulated benefit obligation | 161 | 155 |
Fair value of plan assets | $ 0 | $ 0 |

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