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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Allowance for Funds Used During Construction, Capitalized Interest $ 3us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest $ 3us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
Earnings Per Share, Diluted $ 2.80us-gaap_EarningsPerShareDiluted $ 1.37us-gaap_EarningsPerShareDiluted
SCEG    
Allowance for Funds Used During Construction, Capitalized Interest $ 3us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
/ dei_LegalEntityAxis
= scg_ScegMember
$ 3us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
/ dei_LegalEntityAxis
= scg_ScegMember