INCOME TAXES INCOME TAXES (Details 2) - USD ($)	3 Months Ended								12 Months Ended
INCOME TAXES INCOME TAXES (Details 2) - USD ($)	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
income tax [Line Items]
Deferred Tax Liability, Impairment	$ 668,000,000				$ 962,000,000				$ 668,000,000	$ 962,000,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent								35.00%	21.00%	35.00%
Income Available to Common Shareholders	(772,000,000)	$ 67,000,000	$ 8,000,000	$ 169,000,000	(445,000,000)	$ 34,000,000	$ 121,000,000	$ 171,000,000	$ (528,000,000)	$ (119,000,000)	$ 595,000,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate									(197,000,000)	(81,000,000)	303,000,000
Income Tax Expense (Benefit) Continuing Operations, Income Tax Reconciliation, Changes [Abstract]
Income Tax Reconciliation, State and Local Income Taxes									(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)
Income Tax Reconciliation, Deductions, Dividends									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
Income Tax Reconciliation, Other Adjustments									2,000,000	(4,000,000)	(1,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent									0	(18,000,000)	(23,000,000)
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
Income Tax Reconciliation, Sale of Subsidiaries									5,000,000	0	0
SCE&G
income tax [Line Items]
Deferred Tax Liability, Impairment	668,000,000				962,000,000				668,000,000	962,000,000
Net Income (Loss) Attributable to Parent	$ (861,000,000)	$ 98,000,000	$ 26,000,000	$ 124,000,000	$ (456,000,000)	$ 39,000,000	$ 123,000,000	$ 109,000,000	(613,000,000)	(185,000,000)	513,000,000
Net Income (Loss) Attributable to Noncontrolling Interest									25,000,000	13,000,000	13,000,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate									(211,000,000)	(120,000,000)	271,000,000
Income Tax Expense (Benefit) Continuing Operations, Income Tax Reconciliation, Changes [Abstract]
Income Tax Reconciliation, State and Local Income Taxes									(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
Income Tax Reconciliation, Other Adjustments									2,000,000	(4,000,000)	(2,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent									0	(18,000,000)	(23,000,000)
Income Tax Expense (Benefit)									(416,000,000)	(171,000,000)	248,000,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									(1,005,000,000)	(343,000,000)	774,000,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic									$ (1,005,000,000)	$ (343,000,000)	$ 774,000,000

SCANA CORP 10-K