RATE AND OTHER REGULATORY MATTERS ELECTRIC-BLRA (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Entity Information [Line Items] | ||
| Utilities Operating Expense, Impairments | $ 1,376.0 | $ 1,118.0 |
| Accumulated Carrying Costs Written Off | $ 51.0 | |
| Public Utilities Percentage Change in Retail Electric Rates Approved under BLRA | 18.00% | |
| SCE&G | ||
| Entity Information [Line Items] | ||
| Utilities Operating Expense, Impairments | $ 1,376.0 | $ 1,118.0 |