v3.10.0.1
AFFILIATED TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Millions of Dollars
 
2018
 
2017
 
2016
Purchases from Canadys Refined Coal, LLC
 
$
149.9

 
$
162.1

 
$
161.8

Sales to Canadys Refined Coal, LLC
 
149.0

 
161.1

 
160.8

Millions of Dollars
 
2018
 
2017
Receivable from Canadys Refined Coal, LLC
 
$
6.8

 
$
4.9

Payable to Canadys Refined Coal, LLC
 
6.8

 
4.9
SCE&G  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Millions of Dollars
 
2018
 
2017
 
2016
Purchases from Canadys Refined Coal, LLC
 
$
149.9

 
$
162.1

 
$
161.8

Sales to Canadys Refined Coal, LLC
 
149.0

 
161.1

 
160.8

Millions of Dollars
 
2018
 
2017
Receivable from Canadys Refined Coal, LLC
 
$
6.8

 
$
4.9

Payable to Canadys Refined Coal, LLC
 
6.8

 
4.9

Millions of Dollars
 
2018
 
2017
 
2016
Purchases from SCANA Energy
 
$
139.0

 
$
127.4

 
$
111.5

Direct and Allocated Costs from SCANA Services
 
283.3

 
302.8

 
337.7

Millions of Dollars
 
2018
 
2017
Payable to SCANA Energy
 
$
14.1

 
$
10.0

Payable to SCANA Services
 
37.7

 
42.0