Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of unrecognized tax benefits.

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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
INCOME TAXES (Details) - USD ($) $ in Millions	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 276
Unrecognized Tax Benefits		254	$ 44
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		228
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound		$ 49
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent		4.00%
SCEG
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 276
Unrecognized Tax Benefits		254	$ 44
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		228
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound		$ 49
Scenario, Forecast [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	3.00%