v3.10.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Feb. 15, 2019
Jun. 30, 2018
Document Information [Line Items]      
Entity Registrant Name SCANA CORP    
Entity Central Index Key 0000754737    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   100  
Entity Public Float     $ 5,486,355,874
SCE&G      
Document Information [Line Items]      
Entity Registrant Name SOUTH CAROLINA ELECTRIC & GAS CO    
Entity Central Index Key 0000091882    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   40,296,147