DERIVATIVE FINANCIAL INSTRUMENTS Fair Value on Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Asset	$ 20	$ 21
Derivative Liability	379	289
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	6	5
Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	69	50
Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	14	16
Derivative Liability	4	6
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability	355	257
Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset	1	1
Derivative Liability	5	12
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Asset	19	20
Derivative Liability	19	20
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	42	45
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	33	28
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	4	11
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 Asset	20	21
Derivative Liability	337	244
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	288	207
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	30	17
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	1	1
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	10	10
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	6	5
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	6	5
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	13	15
Derivative Liability	3	5
SCEG
Derivative [Line Items]
Derivative Liability	329	233
SCEG | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	40	25
SCEG | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability	329	233
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	318	224
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	288	207
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	$ 30	$ 17