2.2.0.25truefalse0609 - Disclosure - Nuclear Insurance (Details)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0so_NuclearInsuranceTextualsAbstractsofalsenadurationNuclear insurance.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNuclear insurance.falsefalseNuclear Insurance (Textuals) [Abstract]4false0so_MaximumFundProvidedForPublicLiabilityClaimssofalsedebitdurationMaximum fund provided for public liability claims arising from a single nuclear incident under Price-Anderson Amendments 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plant6false0so_MaximumAmountForEachLicensedReactorsofalsedebitdurationMaximum amount that a company could be assessed per incident for each licensed reactor.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse117500000117500000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum amount that a company could be assessed per incident for each licensed reactor.No authoritative reference available.falsefalseMaximum amount that a company could be assessed per incident for each licensed reactor7false0so_MaximumAggregateAmountForEachIncidentsofalsedebitdurationMaximum aggregate amount that a reactor can assess in a calender period for each incident.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1750000017500000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum aggregate amount that a reactor can assess in a calender period for each incident.No authoritative reference available.falsefalseMaximum aggregate amount that a reactor can assess in a calender period for each incident8false0so_MaximumAggregateAmountToBePaidInOneYearsofalsedebitdurationMaximum aggregate amount to be paid in one year.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse3500000035000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum aggregate amount to be paid in one year.No authoritative reference available.falsefalseMaximum aggregate amount to be paid in one year9false0so_BlockPeriodConsideredForInflationAdjustmentAgainstMaximumAssessmentPerReactorsofalsenadurationBlock period considered for inflation adjustment against maximum assessment per reactor.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00Every 5 yearsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringBlock period considered for inflation adjustment against maximum assessment per reactor.No authoritative reference available.falsefalseBlock period considered for 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[Abstract]20false0so_MaximumAssessmentExcludingApplicableStatePremiumTaxessofalsedebitdurationMaximum assessment, excluding any applicable state premium taxes.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse235000000235000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum assessment, excluding any applicable state premium taxes.No authoritative reference available.falsefalseMaximum assessment, excluding any applicable state premium taxes21false0so_CurrentMaximumAnnualAssessmentssofalsenadurationCurrent maximum annual assessments under NEIL policies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse4200000042000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCurrent maximum annual assessments under NEIL policies.No authoritative reference available.falsefalseCurrent maximum annual assessments under NEIL policies23false0natruenanaNo definition 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