DERIVATIVE FINANCIAL INSTRUMENTS FAIR VALUE ON BALANCE SHEET (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Liability	$ 106	$ 289
Derivative Asset	30	21
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	8	5
Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	53	50
Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	3	6
Derivative Asset	22	16
Interest Rate Contract
Derivative [Line Items]
Derivative Liability	87	257
Derivative Asset	15
Commodity Contracts
Derivative [Line Items]
Derivative Liability	5	12
Derivative Asset	1	1
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Liability	14	20
Derivative Asset	14	20
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	37	45
Designated as Hedging Instrument [Member] | Interest Rate Contract | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	4	5
Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	28	28
Designated as Hedging Instrument [Member] | Commodity Contracts | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	4	11
Designated as Hedging Instrument [Member] | Commodity Contracts | Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	1	1
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	69	244
Derivative Asset	30	21
Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	33	207
Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	5
Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	22	17
Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	10
Not Designated as Hedging Instrument [Member] | Commodity Contracts | 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	9	10
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	3	5
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	3	5
Not Designated as Hedging Instrument [Member] | Other Energy Management Contract [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	2	5
Derivative Asset	11	15
SCE&G
Derivative [Line Items]
Derivative Liability	65	233
Derivative Asset	15
SCE&G | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	5
SCE&G | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	31	25
SCE&G | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	10
SCE&G | Interest Rate Contract
Derivative [Line Items]
Derivative Liability	65	233
Derivative Asset	15
SCE&G | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	10	9
SCE&G | Designated as Hedging Instrument [Member] | Interest Rate Contract | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	1	1
SCE&G | Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	9	8
SCE&G | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability	55	224
Derivative Asset	15
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability	33	207
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	5
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	22	$ 17
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset	$ 10