Regulatory Matters - Nuclear Construction (Details) - Georgia Power $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2009
utility
MW
|
|
| Loss Contingencies [Line Items] | |||
| Number of construction units approved | utility | 2 | ||
| Electric generating capacity (mw) | MW | 1,100 | ||
| Plant Vogtle Units 3 And 4 | |||
| Loss Contingencies [Line Items] | |||
| Percent ownership | 45.70% | ||
| Construction financing costs | $ 1,900 | ||
| Additional base capital costs per month | 50 | ||
| AFUDC per month | $ 12 | ||
| Plant Vogtle Units 3 And 4 | Scenario, Forecast | |||
| Loss Contingencies [Line Items] | |||
| Construction financing costs | $ 3,100 | ||
| Vogtle Owners | Plant Vogtle Units 3 And 4 | |||
| Loss Contingencies [Line Items] | |||
| Period of notice required in the event letters of credit are not renewed | 30 days | ||