LONG-TERM AND SHORT-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Medium-term Notes	800us-gaap_MediumTermNotes	800us-gaap_MediumTermNotes
Senior Notes	88us-gaap_SeniorNotes	92us-gaap_SeniorNotes
First Mortgage Bonds	3,840scg_FirstMortgageBonds	3,540scg_FirstMortgageBonds
Junior Subordinated Notes	150us-gaap_JuniorSubordinatedNotes	150us-gaap_JuniorSubordinatedNotes
GENCO Notes	227scg_GENCONotes	233scg_GENCONotes
Industrial and Pollution Control Bonds	122scg_IndustrialandPollutionControlBonds	158scg_IndustrialandPollutionControlBonds
Senior Notes, Noncurrent	350us-gaap_SeniorLongTermNotes	350us-gaap_SeniorLongTermNotes
Long Term Contract for Nuclear Fuel Purchase	100	100
Other Long-term Debt	17us-gaap_OtherLongTermDebt	20us-gaap_OtherLongTermDebt
Long-term Debt, Gross	5,694us-gaap_DebtInstrumentCarryingAmount	5,443us-gaap_DebtInstrumentCarryingAmount
Long-term Debt, Current Maturities	(166)us-gaap_LongTermDebtCurrent	(54)us-gaap_LongTermDebtCurrent
Debt Instrument, Unamortized Discount	3	6
Long-term Debt	5,531us-gaap_LongTermDebt	5,395us-gaap_LongTermDebt
Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.42%	5.42%
Debt Instrument, Redemption Period, Start Date	Apr. 01, 2020
Debt Instrument, Redemption Period, End Date	Feb. 01, 2022
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.93%	0.94%
Debt Instrument, Redemption Period, Start Date	Jun. 01, 2015
Debt Instrument, Redemption Period, End Date	Jun. 01, 2034
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.17%
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.56%	5.60%
Debt Instrument, Redemption Period, Start Date	Nov. 01, 2018
Debt Instrument, Redemption Period, End Date	Jun. 01, 2064
Junior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	7.92%	7.92%
Debt Instrument, Redemption Period, End Date	Jan. 30, 2065
Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.90%	5.89%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2015
Debt Instrument, Redemption Period, End Date	Feb. 01, 2024
Industrial and Pollution Control Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.51%	3.83%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2028
Debt Instrument, Redemption Period, End Date	Dec. 01, 2038
Long-term Debt, Percentage Bearing Variable Interest, Amount	67.8
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	0.04%	0.11%
Senior Debentures [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.93%	5.93%
Debt Instrument, Redemption Period, Start Date	Mar. 30, 2020
Debt Instrument, Redemption Period, End Date	Dec. 15, 2026
Nuclear fuel purchase contract [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.78%	0.78%
Debt Instrument, Redemption Period, End Date	Nov. 01, 2016
Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.90%	2.73%
Debt Instrument, Redemption Period, Start Date	Jan. 01, 2015
Debt Instrument, Redemption Period, End Date	Sep. 30, 2027
SCE&G
Debt Instrument [Line Items]
First Mortgage Bonds	3,840	3,540
GENCO Notes	227	233
Industrial and Pollution Control Bonds	122	158
Long Term Contract for Nuclear Fuel Purchase	100	100
Other Long-term Debt	14	16
Long-term Debt, Gross	4,303	4,047
Long-term Debt, Current Maturities	(10)	(48)
Debt Instrument, Unamortized Discount	6	8
Long-term Debt	4,299	4,007
SCE&G \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.56%	5.60%
Debt Instrument, Redemption Period, Start Date	Nov. 01, 2018
Debt Instrument, Redemption Period, End Date	Jun. 01, 2064
SCE&G \| Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.90%	5.89%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2015
Debt Instrument, Redemption Period, End Date	Feb. 01, 2024
SCE&G \| Industrial and Pollution Control Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.51%	3.83%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2028
Debt Instrument, Redemption Period, End Date	Dec. 01, 2038
Long-term Debt, Percentage Bearing Variable Interest, Amount	67.8
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		0.11%
SCE&G \| Nuclear fuel purchase contract [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.78%	0.78%
Debt Instrument, Redemption Period, End Date	Nov. 01, 2016
SCE&G \| Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.63%	2.26%
Debt Instrument, Redemption Period, Start Date	Jan. 31, 2015
Debt Instrument, Redemption Period, End Date	Sep. 30, 2027

First Mortgage Bonds

No definition available.

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- Definition

GENCO Notes

+ References

No definition available.

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- Definition

Industrial and Pollution Control Bonds

+ References

No definition available.

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- Definition

Long Term Contract for Nuclear Fuel Purchase

+ References

No definition available.

+ Details

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

End date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

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- Definition

Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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