DERIVATIVE FINANCIAL INSTRUMENTS FAIR VALUE ON BALANCE SHEET (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 67	$ 107
Derivative Liability	64	106
Derivative Asset	86	30
Derivative Asset, Fair Value, Gross Asset	90	31
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	72	8
Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	29	53
Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability		3
Derivative Asset	5	22
Prepayments [Member]
Derivative [Line Items]
Derivative Asset	9
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	58	87
Derivative Liability	58	87
Derivative Asset	71	15
Derivative Asset, Fair Value, Gross Asset	71	15
Commodity Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		5
Derivative Liability	0	5
Derivative Asset	9	1
Derivative Asset, Fair Value, Gross Asset	9	1
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	9	15
Derivative Liability	6	14
Derivative Asset	6	14
Derivative Asset, Fair Value, Gross Asset	10	15
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	28	37
Derivative Asset, Fair Value, Gross Asset	6
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	4	4
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	24	28
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		4
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		1
Derivative Asset, Fair Value, Gross Asset	1
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Prepayments [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	5
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	39	69
Derivative Asset, Fair Value, Gross Asset	84	30
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	27	33
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	71	5
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	3	22
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		10
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	1
Not Designated as Hedging Instrument [Member] \| Other Energy Management Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	4	9
Not Designated as Hedging Instrument [Member] \| Other Energy Management Contract [Member] \| Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	3
Not Designated as Hedging Instrument [Member] \| Other Energy Management Contract [Member] \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	2	3
Not Designated as Hedging Instrument [Member] \| Other Energy Management Contract [Member] \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	2
Derivative Asset, Fair Value, Gross Asset	2	11
Not Designated as Hedging Instrument [Member] \| Other Energy Management Contract [Member] \| Prepayments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	2
Derivative Asset, Fair Value, Gross Asset	6
SCE&G
Derivative [Line Items]
Derivative Liability	39	65
Derivative Asset	71	15
SCE&G \| Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	71	5
SCE&G \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	11	31
SCE&G \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset		10
SCE&G \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	39	65
Derivative Liability	39	65
Derivative Asset	71	15
Derivative Asset, Fair Value, Gross Asset	71	15
SCE&G \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	9	10
SCE&G \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	1
SCE&G \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	8	9
SCE&G \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	30	55
Derivative Asset, Fair Value, Gross Asset	71	15
SCE&G \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	27	33
SCE&G \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	71	5
SCE&G \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 3	22
SCE&G \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 10

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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