v3.10.0.1

INCOME TAXES (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 539,000,000			$ 539,000,000	$ 600,000,000
Deferred Tax Asset, Legal Settlement net of tax	274,000,000			274,000,000	273,000,000
Unrecognized Tax Benefits, gross of state deduction on federal return and certain operating loss and tax credit carryfowards	106,000,000			106,000,000	$ 98,000,000	$ 350,000,000	$ 49,000,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	11,000,000			11,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	106,000,000			$ 106,000,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	21.00%	35.00%
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)				$ (8,000,000)	$ (414,000,000)	36,000,000
Current State and Local Tax Expense (Benefit)				5,000,000	18,000,000	13,000,000
Current Income Tax Expense (Benefit)				(3,000,000)	(396,000,000)	49,000,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred State and Local Income Tax Expense (Benefit)				(55,000,000)	(37,000,000)	21,000,000
Income Tax Reconciliation, Tax Credits, Investment [Abstract]
Income Tax Expense (Benefit)				(412,000,000)	(112,000,000)	271,000,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic				(940,000,000)	(231,000,000)	866,000,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				(197,000,000)	(81,000,000)	303,000,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				(37,000,000)	(7,000,000)	27,000,000
Income Tax Reconciliation, Amortization of State and Local Investment Tax Credits				(3,000,000)	(5,000,000)	(5,000,000)
Income Tax Reconciliation, Allowance for Cost of Equity Funds Used During Construction				(4,000,000)	(8,000,000)	(10,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount				(2,000,000)	(9,000,000)	(10,000,000)
Amortization of Amounts Deferred under Federal Investment Tax Credits				(2,000,000)	(2,000,000)	(2,000,000)
Section 45 tax credit				(9,000,000)	(8,000,000)	(8,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent				0	(18,000,000)	(23,000,000)
Income Tax Reconcilation, Tax Reform Remeasurement				188,000,000	(30,000,000)
Income Tax Reconciliation, Sale of Subsidiaries				5,000,000	0	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				2,000,000	(4,000,000)	(1,000,000)
Deferred tax Nuclear Decommissioning	143,000,000			143,000,000	141,000,000
Deferred Tax Asset, Remeasurement	0			0	54,000,000
Deferred Tax Assets, Financial Instruments	10,000,000			10,000,000	15,000,000
Deferred Tax Asset, Unamortized Investment, Tax Credits	7,000,000			7,000,000	8,000,000
Deferred Tax Assets, Other	4,000,000			4,000,000	6,000,000
Deferred Tax Assets, Net	1,061,000,000			1,061,000,000	1,185,000,000
Deferred Tax Liabilities, Property, Plant and Equipment	1,227,000,000			1,227,000,000	1,220,000,000
Deferred Tax Liability, Impairment	668,000,000			668,000,000	962,000,000
Deferred Tax Liabilities, Tax Deferred Expense Compensation and Benefits, Employee Benefits	60,000,000			60,000,000	60,000,000
Deferred Tax Liabilities, Asset Retirement Obligation	94,000,000			94,000,000	91,000,000
Deferred tax asset unrecovered plant	24,000,000			24,000,000	27,000,000
Deferred Tax Liability, Demand Side Management	16,000,000			16,000,000	16,000,000
deferred tax liability, prepayments	21,000,000			21,000,000	21,000,000
Deferred Tax Liabilities, Other	63,000,000			63,000,000	49,000,000
Deferred Tax Liabilities, Net	2,173,000,000			2,173,000,000	2,446,000,000
Deferred Tax Liabilities, Net, Noncurrent	1,112,000,000			1,112,000,000	1,261,000,000
Unrecognized tax benefits	38,000,000			38,000,000	19,000,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions				8,000,000	0	94,000,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions				0	(273,000,000)	0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions				0	21,000,000	207,000,000
Utilities Operating Loss, Impairment, Net of Taxes	870,000,000	$ 3,000,000		53,000,000	690,000,000
SCE&G
Investments, Owned, Federal Income Tax Note [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest				(614,000,000)
Deferred Tax Assets, Operating Loss Carryforwards	493,000,000			493,000,000	541,000,000
Deferred Tax Asset, Legal Settlement net of tax	274,000,000			274,000,000	273,000,000
Unrecognized Tax Benefits, gross of state deduction on federal return and certain operating loss and tax credit carryfowards	106,000,000			106,000,000	98,000,000	350,000,000	$ 49,000,000
Unrecognized Tax Benefits, Income Tax Penalties Expense				0
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)				(16,000,000)	(410,000,000)	50,000,000
Current State and Local Tax Expense (Benefit)				0	(18,000,000)	13,000,000
Current Income Tax Expense (Benefit)				(16,000,000)	(428,000,000)	63,000,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred State and Local Income Tax Expense (Benefit)				52,000,000	(2,000,000)	20,000,000
Income Tax Reconciliation, Tax Credits, Investment [Abstract]
Income Tax Expense (Benefit)				(416,000,000)	(171,000,000)	248,000,000
Net Income (Loss) Attributable to Noncontrolling Interest				25,000,000	13,000,000	13,000,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic				(1,005,000,000)	(343,000,000)	774,000,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				(211,000,000)	(120,000,000)	271,000,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				(38,000,000)	(8,000,000)	26,000,000
Income Tax Reconciliation, Amortization of State and Local Investment Tax Credits				(3,000,000)	(5,000,000)	(5,000,000)
Income Tax Reconciliation, Allowance for Cost of Equity Funds Used During Construction				(2,000,000)	(5,000,000)	(9,000,000)
Amortization of Amounts Deferred under Federal Investment Tax Credits				(2,000,000)	(2,000,000)	(2,000,000)
Section 45 tax credit				(9,000,000)	(8,000,000)	(8,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent				0	(18,000,000)	(23,000,000)
Income Tax Reconcilation, Tax Reform Remeasurement				176,000,000	1,000,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				2,000,000	(4,000,000)	(2,000,000)
Deferred tax Nuclear Decommissioning	135,000,000			135,000,000	132,000,000
Deferred Tax Asset, Remeasurement	0			0	54,000,000
Deferred Tax Asset, Unamortized Investment, Tax Credits	7,000,000			7,000,000	8,000,000
Deferred Tax Assets, Other	5,000,000			5,000,000	5,000,000
Deferred Tax Assets, Net	954,000,000			954,000,000	1,055,000,000
Deferred Tax Liabilities, Property, Plant and Equipment	1,033,000,000			1,033,000,000	1,035,000,000
Deferred Tax Liability, Impairment	668,000,000			668,000,000	962,000,000
Deferred Tax Liabilities, Tax Deferred Expense Compensation and Benefits, Employee Benefits	53,000,000			53,000,000	53,000,000
Deferred Tax Liabilities, Asset Retirement Obligation	88,000,000			88,000,000	85,000,000
Deferred tax asset unrecovered plant	24,000,000			24,000,000	27,000,000
Deferred Tax Liability, Demand Side Management	16,000,000			16,000,000	16,000,000
deferred tax liability, prepayments	20,000,000			20,000,000	19,000,000
Deferred Tax Liabilities, Other	41,000,000			41,000,000	31,000,000
Deferred Tax Liabilities, Net	1,943,000,000			1,943,000,000	2,228,000,000
Deferred Tax Liabilities, Net, Noncurrent	989,000,000			989,000,000	1,173,000,000
Unrecognized tax benefits	$ 38,000,000			38,000,000	19,000,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions				8,000,000	0	94,000,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions				0	(273,000,000)	0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions				0	$ 21,000,000	$ 207,000,000
Utilities Operating Loss, Impairment, Net of Taxes				$ 46,000,000

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Deferred tax Nuclear Decommissioning

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