EMPLOYEE BENEFIT PLANS Table 7 - Assumptions - Benefit Obligations (Details) |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 2.84% | 3.34% | 4.40% |
| Rate of compensation increase | 3.51% | 3.51% | |
| Cash balance interest crediting rate | 2.00% | 2.00% | |
| Other Postretirement Benefit Plans [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 2.83% | 3.43% |