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COMMITMENTS AND CONTINGENCIES Operating Leases Tables (Tables) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
 
 
Rent Expense
 
Future Minimum Rental Payments
Millions of dollars
 
2016
 
2017
 
2018
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
The Company
 
$
10.2

 
$
10

 
$
9.7

 
$
10

 
$
8

 
$
7

 
$
6

 
$
4

 
$
30

Consolidated SCE&G
 
12.2

 
11.4

 
10.2

 
3

 
2

 
1

 
1

 

 
16

   
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 10,000,000    
Operating Leases, Future Minimum Payments, Due in Two Years 8,000,000    
Operating Leases, Future Minimum Payments, Due in Three Years 7,000,000    
Operating Leases, Future Minimum Payments, Due in Four Years 6,000,000    
Operating Leases, Future Minimum Payments, Due in Five Years 4,000,000    
Operating Leases, Future Minimum Payments, Due Thereafter $ 30,000,000    
Long-term Purchase Commitment [Table Text Block]
 
 
Future Payments
Millions of dollars
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
The Company and Consolidated SCE&G
 
$
40

 
$
39

 
$
39

 
$
38

 
$
38

 
$
396

   
Contractual Obligation, Due in Next Fiscal Year $ 23.7 $ 3.6  
Contractual Obligation, Due in Second Year 39,000,000    
Contractual Obligation, Due in Third Year 39,000,000    
Contractual Obligation, Due in Fourth Year 38,000,000    
Contractual Obligation, Due in Fifth Year 38,000,000    
Contractual Obligation, Due after Fifth Year $ 396,000,000    
Operating Lease, Payments   10  
SCE&G      
Operating Leased Assets [Line Items]      
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
 
 
Rent Expense
 
Future Minimum Rental Payments
Millions of dollars
 
2016
 
2017
 
2018
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
The Company
 
$
10.2

 
$
10

 
$
9.7

 
$
10

 
$
8

 
$
7

 
$
6

 
$
4

 
$
30

Consolidated SCE&G
 
12.2

 
11.4

 
10.2

 
3

 
2

 
1

 
1

 

 
16

   
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 3,000,000    
Operating Leases, Future Minimum Payments, Due in Two Years 2,000,000    
Operating Leases, Future Minimum Payments, Due in Three Years 1,000,000    
Operating Leases, Future Minimum Payments, Due in Four Years 1,000,000    
Operating Leases, Future Minimum Payments, Due in Five Years 0    
Operating Leases, Future Minimum Payments, Due Thereafter $ 16,000,000    
Long-term Purchase Commitment [Table Text Block]
 
 
Future Payments
Millions of dollars
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
The Company and Consolidated SCE&G
 
$
40

 
$
39

 
$
39

 
$
38

 
$
38

 
$
396

   
Operating Lease, Payments $ 10 $ 11 $ 12