ASSET RETIREMENT OBLIGATIONS - Accumulated Provisions for the External Decommissioning Trust Funds (Details) - External decommissioning trust funds - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Georgia Power | ||
| Public Utilities, General Disclosures [Line Items] | ||
| Accumulated provisions for decommissioning | $ 1,236 | $ 1,163 |
| Plant Farley | Alabama Power | ||
| Public Utilities, General Disclosures [Line Items] | ||
| Accumulated provisions for decommissioning | 1,385 | 1,259 |
| Plant Hatch | Georgia Power | ||
| Public Utilities, General Disclosures [Line Items] | ||
| Accumulated provisions for decommissioning | 735 | 705 |
| Plant Vogtle Units 1 and 2 | Georgia Power | ||
| Public Utilities, General Disclosures [Line Items] | ||
| Accumulated provisions for decommissioning | 460 | 434 |
| Plant Vogtle Units 3 and 4 | Georgia Power | ||
| Public Utilities, General Disclosures [Line Items] | ||
| Accumulated provisions for decommissioning | $ 41 | $ 24 |