Regulatory Matters - MPC (Details) $ in Millions |
1 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Jul. 31, 2023
USD ($)
|
May 02, 2023
USD ($)
|
Apr. 04, 2023
USD ($)
|
Apr. 03, 2023
USD ($)
|
Oct. 31, 2023
MW
|
Jul. 31, 2022
USD ($)
|
|
| Loss Contingencies [Line Items] | ||||||
| Minimum annual accrual, amount | $ 8 | |||||
| MISSISSIPPI POWER CO | ||||||
| Loss Contingencies [Line Items] | ||||||
| Approved rate increase (decrease) | $ 12 | |||||
| MISSISSIPPI POWER CO | Subsequent Event | ||||||
| Loss Contingencies [Line Items] | ||||||
| Approved capacity increase (in MWs) | MW | 750 | |||||
| MISSISSIPPI POWER CO | Ad Valorem Tax Adjustment | ||||||
| Loss Contingencies [Line Items] | ||||||
| Requested rate increase (decrease) amount | $ (7) | |||||
| MISSISSIPPI POWER CO | ECO Plan | ||||||
| Loss Contingencies [Line Items] | ||||||
| Approved rate increase (decrease) | $ 3 | |||||
| MISSISSIPPI POWER CO | Municipal And Rural Associations Tariff | ||||||
| Loss Contingencies [Line Items] | ||||||
| Requested rate increase (decrease) amount | $ 16 | $ 23 | ||||
| Customer refund payments | $ 6 | |||||