DERIVATIVE FINANCIAL INSTRUMENTS Fair Value on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Liability	$ 223	$ 289
Derivative Asset	21	21
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	11	5
Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	95	50
Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	3	6
Derivative Asset	10	16
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability	202	257
Derivative Asset	6
Commodity Contract [Member]
Derivative [Line Items]
Derivative Liability	7	12
Derivative Asset		1
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Liability	14	20
Derivative Asset	15	20
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	$ 42	45
Derivative Asset
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	$ 4	5
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	31	28
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	$ 6	11
Derivative Asset
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	$ 1	1
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	181	244
Derivative Asset	21	21
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	107	207
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	6
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	60	17
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset		1
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	8	10
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Liability	0
Derivative Asset	5	5
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	4
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	2	5
Derivative Asset	10	15
SCEG
Derivative [Line Items]
Derivative Liability	178	233
SCEG | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	6
SCEG | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	70	25
SCEG | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability	178	233
Derivative Asset	6
SCEG | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	11	9
SCEG | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	1	1
SCEG | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	10	8
SCEG | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	167	224
Derivative Asset	6
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	107	207
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	6
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	$ 60	$ 17