RATE AND OTHER REGULATORY MATTERS GAS (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Entity Information [Line Items] | |||
| Public Utilities, Approved Rate Increase (Decrease), Percentage | 3.20% | ||
| PSNC Energy Rate Case Application, Increase Amount | $ 0.18 | ||
| SCE&G | |||
| Entity Information [Line Items] | |||
| Public Utilities, Percent Increase (Decrease) in Retail Natural Gas Rates | 4.60% | 2.20% | 1.20% |
| Public Utilities changes in Retail Natural Gas Rates Approved under RSA | $ 19,700,000 | $ 8,600,000 | $ 4,100,000 |
| PSNC Energy [Member] | |||
| Entity Information [Line Items] | |||
| Public Utilities, Approved Rate Increase (Decrease), Percentage | 4.39% | ||
| Public Utilities, Authorized Allowable Return on Common Equity, Percentage | 9.70% | ||
| PSNC Energy Rate Case Application, Increase Amount | $ 19,100,000 | ||