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Long Term Purchase Commitment (Tables)
12 Months Ended
Dec. 31, 2018
Long-term Purchase Commitment [Line Items]  
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

SCE&G  
Long-term Purchase Commitment [Line Items]  
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