INCOME TAXES (Details) |
6 Months Ended | |
|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Income Tax Contingency [Line Items] | ||
| Effective tax (benefit) rate | 9.30% | 33.50% |
| GEORGIA POWER CO | ||
| Income Tax Contingency [Line Items] | ||
| Effective tax (benefit) rate | 4.00% | 21.70% |
| MISSISSIPPI POWER CO | ||
| Income Tax Contingency [Line Items] | ||
| Effective tax (benefit) rate | 10.60% | 14.00% |
| SOUTHERN POWER CO | ||
| Income Tax Contingency [Line Items] | ||
| Effective tax (benefit) rate | 10.50% | (35.50%) |
| SOUTHERN Co GAS | ||
| Income Tax Contingency [Line Items] | ||
| Effective tax (benefit) rate | 21.50% | 18.00% |