Regulatory Matters - Cost Recovery Clauses (Details) - USD ($) $ in Millions |
Jun. 30, 2019 |
Feb. 05, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| ALABAMA POWER CO | |||
| Loss Contingencies [Line Items] | |||
| Rate RSE Refund Liability | $ 75 | ||
| ALABAMA POWER CO | Deferred under recovered regulatory clause revenues | |||
| Loss Contingencies [Line Items] | |||
| Rate CNP Compliance | $ 0 | $ 42 | |
| Rate CNP PPA | 25 | 25 | |
| Retail Energy Cost Recovery | 0 | 109 | |
| ALABAMA POWER CO | Customer accounts receivable | |||
| Loss Contingencies [Line Items] | |||
| Rate CNP Compliance | 10 | 0 | |
| Retail Energy Cost Recovery | 8 | 0 | |
| ALABAMA POWER CO | Other regulatory liabilities, deferred | |||
| Loss Contingencies [Line Items] | |||
| Natural Disaster Reserve | 19 | 20 | |
| GEORGIA POWER CO | Receivables – under recovered fuel clause revenues | |||
| Loss Contingencies [Line Items] | |||
| Fuel Cost Recovery | 69 | 115 | |
| MISSISSIPPI POWER CO | Over recovered regulatory clause liabilities | |||
| Loss Contingencies [Line Items] | |||
| Fuel Cost Recovery | $ 9 | $ 8 |