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COMMITMENTS AND CONTINGENCIES Asset Retirement Obligation (Tables)
 9 Months Ended
Sep. 30, 2015
Change in Asset Retirement Obligation [Line Items]  
Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of the beginning and ending carrying amount of asset retirement obligations is as follows:
Millions of dollars
 
September 30, 2015
 
December 31, 2014
Beginning balance
 
$
563

 
$
576

Liabilities incurred
 
—

 
3

Liabilities settled
 
(15
)
 
(6
)
Accretion expense
 
20

 
26

Revisions in estimated cash flows
 
(79
)
 
(36
)
Ending balance
 
$
489

 
$
563
SCEG  
Change in Asset Retirement Obligation [Line Items]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of the beginning and ending carrying amount of asset retirement obligations is as follows:

Millions of dollars
 
September 30, 2015
 
December 31, 2014
Beginning balance
 
$
536

 
$
547

Liabilities incurred
 
—

 
3

Liabilities settled
 
(15
)
 
(6
)
Accretion expense
 
18

 
25

Revisions in estimated cash flows
 
(79
)
 
(33
)
Ending balance
 
$
460

 
$
536