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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 382  
Unrecognized Tax Benefits 274 $ 219
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 17  
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 273  
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 53  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.00% 4.00%
SCEG    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 382  
Unrecognized Tax Benefits 333 $ 236
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 17  
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 273  
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 53