REGULATORY MATTERS - Southern Company Gas (Details) - USD ($) $ in Millions |
Jul. 01, 2020 |
Jun. 01, 2020 |
Jun. 30, 2020 |
|---|---|---|---|
| Nicor Gas | |||
| Loss Contingencies [Line Items] | |||
| Requested rate increase | $ 49.6 | ||
| Requested rate increase, projected test year, period | 12 months | ||
| Requested return on equity percentage | 10.35% | ||
| Requested equity ratio percentage | 54.00% | ||
| Subsequent Event | Atlanta Gas Light | |||
| Loss Contingencies [Line Items] | |||
| Requested rate increase | $ 37.6 | ||
| Requested rate increase, projected test year, period | 12 months | ||
| Maximum base rate | 5.00% | ||
| COVID-19 | Nicor Gas | |||
| Loss Contingencies [Line Items] | |||
| Regulatory assets | $ 12.0 | ||
| COVID-19 | Virginia Natural Gas | |||
| Loss Contingencies [Line Items] | |||
| Regulatory assets | $ 1.0 |