Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12003 Months Ended |
|---|---|---|---|
Sep. 30, 2023 |
Sep. 30, 2023 |
Dec. 31, 2022 |
|
| Loss Contingencies [Line Items] | |||
| Pre-tax charge to income | $ 160 | $ 407 | |
| Plant Vogtle Units 3 And 4 | |||
| Loss Contingencies [Line Items] | |||
| Base project capital cost forecast | 10,736 | $ 10,736 | |
| Construction contingency estimate | 17 | 17 | |
| Total project capital cost forecast | 10,753 | 10,753 | |
| Net investment as of end of the period | (10,495) | (10,495) | |
| Remaining estimate to complete | 258 | 258 | |
| Estimated cost to complete, costs not shared with other owners | 610 | 610 | |
| Estimated cost to complete, construction monitoring costs approved for recovery | 33 | 33 | |
| Pre-tax charge to income | $ 567 | ||
| Expected capitalized costs | 420 | ||
| Capitalized interest accrued | 385 | 385 | |
| Plant Vogtle Units 3 And 4 | Twenty Fifth Vogtle Construction Monitoring Report | |||
| Loss Contingencies [Line Items] | |||
| Guarantor obligations | $ 1,700 | 1,700 | |
| Customer refund | $ 188 |