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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse650000000650falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse300000000300falsetruefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.No authoritative reference available.falsefalseNotional Amount12false0us-gaap_NotionalAmountOfFairValueHedgeInstrumentsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse350000000350falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate notional amount of all derivatives designated as a fair value hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.No authoritative reference available.falsefalseNotional Amount, Fair value hedges of existing debt13false0so_NotionalAmountOfInterestRateDerivativesInterestRateReceivedsofalsenainstantNotional Amount of Interest Rate Derivatives, Interest Rate Received.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse003-month LIBOR + 0.40% spread3-month LIBOR + 0.40% spreadfalsefalsefalsetruefalse6falsefalsefalse000.04150.0415falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringNotional Amount of Interest Rate Derivatives, Interest Rate Received.No authoritative reference available.falsefalseVariable Rate Received14false0so_WeightedAverageFixedRatePaidsofalsenainstantWeighted Average Fixed Rate Paid.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5truetruefalse0.01240.0124falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalse12falsetruefalse00falsefalsefalsetruefalse13falsetruefalse00falsefalsefalsetruefalse14falsetruefalse00falsefalsefalsetruefalse15falsetruefalse00falsefalsefalsetruefalse16falsetruefalse00falsefalsefalsetruefalse17falsetruefalse00falsefalsefalsetruefalse18falsetruefalse00falsefalsefalsetruefalse19falsetruefalse00falsefalsefalsetruefalse20falsetruefalse00falsefalsefalsetruefalse21falsetruefalse00falsefalsefalsetruefalse22falsetruefalse00falsefalsefalsetruefalse23falsetruefalse00falsefalsefalsetruefalse24falsetruefalse00falsefalsefalsetruefalse25falsetruefalse00falsefalsefalsetruefalse26falsetruefalse00falsefalsefalsetruefalse27falsetruefalse00falsefalsefalsetruefalse28falsetruefalse00falsefalsefalsetruefalse29falsetruefalse00falsefalsefalsetruefalse30falsetruefalse00falsefalsefalsetruefalse31falsetruefalse00falsefalsefalsetruefalse32falsetruefalse00falsefalsefalsetruefalse33falsetruefalse00falsefalsefalsetruefalse34falsetruefalse00falsefalsefalsetruefalse35falsetruefalse00falsefalsefalsetruefalse36falsetruefalse00falsefalsefalsetruefalse37falsetruefalse00falsefalsefalsetruefalse38falsetruefalse00falsefalsefalsetruefalse39falsetruefalse00falsefalsefalsetruefalse40falsetruefalse00falsefalsefalsetruefalse41falsetruefalse00falsefalsefalsetruefalse42falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureWeighted Average Fixed Rate Paid.No authoritative reference available.falsefalseWeighted Average Fixed Rate Paid15false0so_InterestRatePaidOnExistingDebtsofalsenainstantInterest rate paid on existing debt.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse003-month LIBOR + 1.96% spread3-month LIBOR + 1.96% spreadfalsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringInterest rate paid on existing debt.No authoritative reference available.falsefalseInterest Rate Paid16false0us-gaap_DerivativeMaturityDateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsetruefalsefalse2falsefalsefalse00falsefalsetruefalsefalse3falsefalsefalse00falsefalsetruetruefalse4falsefalsefalse00falsefalsetruetruefalse5falsefalsefalse002011-10-012011-10-01falsefalsetruetruefalse6falsefalsefalse002014-05-012014-05-01falsefalsetruetruefalse7falsefalsefalse00falsefalsetruetruefalse8falsefalsefalse00falsefalsetruetruefalse9falsefalsefalse00falsefalsetruetruefalse10falsefalsefalse00falsefalsetruetruefalse11falsefalsefalse00falsefalsetruetruefalse12falsefalsefalse00falsefalsetruetruefalse13falsefalsefalse00falsefalsetruetruefalse14falsefalsefalse00falsefalsetruetruefalse15falsefalsefalse00falsefalsetruetruefalse16falsefalsefalse00falsefalsetruetruefalse17falsefalsefalse00falsefalsetruetruefalse18falsefalsefalse00falsefalsetruetruefalse19falsefalsefalse00falsefalsetruetruefalse20falsefalsefalse00falsefalsetruetruefalse21falsefalsefalse00falsefalsetruetruefalse22falsefalsefalse00falsefalsetruetruefalse23falsefalsefalse00falsefalsetruetruefalse24falsefalsefalse00falsefalsetruetruefalse25falsefalsefalse00falsefalsetruetruefalse26falsefalsefalse00falsefalsetruetruefalse27falsefalsefalse00falsefalsetruetruefalse28falsefalsefalse00falsefalsetruetruefalse29falsefalsefalse00falsefalsetruetruefalse30falsefalsefalse00falsefalsetruetruefalse31falsefalsefalse00falsefalsetruetruefalse32falsefalsefalse00falsefalsetruetruefalse33falsefalsefalse00falsefalsetruetruefalse34falsefalsefalse00falsefalsetruetruefalse35falsefalsefalse00falsefalsetruetruefalse36falsefalsefalse00falsefalsetruetruefalse37falsefalsefalse00falsefalsetruetruefalse38falsefalsefalse00falsefalsetruetruefalse39falsefalsefalse00falsefalsetruetruefalse40falsefalsefalse00falsefalsetruetruefalse41falsefalsefalse00falsefalsetruetruefalse42falsefalsefalse00falsefalsetruetruefalseOtherxbrli:dateItemTypedateThe date the derivative matures.No authoritative reference available.falsefalseHedge Maturity Date17false0so_FairValueGainLosssofalsenainstantFair Value Gain (Loss).falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse90000009falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse-1000000-1falsefalsefalsetruefalse6truefalsefalse1000000010falsefalsefalsetruefalse7truefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse30000003falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Gain (Loss).No authoritative reference available.falsefalseFair Value Gain (Loss) December 31, 201018false0us-gaap_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8truefalsefalse8200000082.0falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10truefalsefalse4110000041.1falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.No authoritative reference available.falsefalseNotional Amount of Foreign Currency Cash Flow Hedge Derivatives19false0so_DerivativesForwardExchangeRatesofalsenainstantDerivatives forward exchange rate.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse0085.326 Yen per Dollar*85.326 Yen per Dollar*falsefalsefalsetruefalse8falsefalsefalse0085.326 Yen per Dollar*85.326 Yen per Dollar*falsefalsefalsetruefalse9falsefalsefalse001.256 Dollars per Euro*1.256 Dollars per Euro*falsefalsefalsetruefalse10falsefalsefalse001.256 Dollars per Euro*1.256 Dollars per Euro*falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringDerivatives forward exchange rate.No authoritative reference available.falsefalseDerivative, Forward Exchange Rate20false0so_DerivativesMaturityDatesofalsenainstantDerivatives maturity date.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00Various through May 2011Various through May 2011falsefalsefalsetruefalse8falsefalsefalse00Various through May 2011Various through May 2011falsefalsefalsetruefalse9falsefalsefalse00Various through July 2012Various through July 2012falsefalsefalsetruefalse10falsefalsefalse00Various through July 2012Various through July 2012falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringDerivatives maturity date.No authoritative reference available.falsefalseDerivatives Maturity Date24true0us-gaap_DerivativeAssetFairValueAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseAssets Derivatives25false0us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValueus-gaaptruedebitinstantNo definition 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value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 falsefalseDerivatives designated as hedging instruments for regulatory purposes, Assets Derivatives26false0us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValueus-gaaptruedebitinstantNo definition 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value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 falsefalseDerivatives not designated as hedging instruments, Assets Derivatives27false0us-gaap_DerivativeFairValueOfDerivativeAssetus-gaaptruedebitinstantNo definition 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value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 truefalseTotal28true0us-gaap_DerivativeLiabilityFairValueAbstractus-gaaptruenadurationNo definition 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value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 falsefalseDerivatives designated as hedging instruments for regulatory purposes, Liability Derivatives30false0us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValueus-gaaptruecreditinstantNo definition 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value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 falsefalseDerivatives not designated as hedging instruments, Liability Derivatives31false0us-gaap_DerivativeFairValueOfDerivativeLiabilityus-gaaptruecreditinstantNo definition 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value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 truefalseTotal32true0us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNetAbstractus-gaaptruenadurationNo definition 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value of all asset derivatives designated as cash flow hedging instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 falsefalseDerivatives designated as hedging instruments in cash flow hedges, Assets Derivatives34false0us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValueus-gaaptruecreditinstantNo definition 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value of all liability derivatives designated as cash flow hedging instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 falsefalseDerivatives designated as hedging instruments in cash flow hedges, Liability Derivatives35true0so_PreTaxEffectOfUnrealizedDerivativeGainsLossesAbstractsofalsenadurationPre Tax Effect Of Unrealized Derivative Gains 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-200000000-200falsefalsefalsefalsefalse2truefalsefalse-177000000-177falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27truefalsefalse-145000000-145falsefalsefalsetruefalse28truefalsefalse-111000000-111falsefalsefalsetruefalse29truefalsefalse-55000000-55falsefalsefalsetruefalse30truefalsefalse-66000000-66falsefalsefalsetruefalse31falsefalsefalse00falsefalsefalsetruefalse32falsefalsefalse00falsefalsefalsetruefalse33falsefalsefalse00falsefalsefalsetruefalse34falsefalsefalse00falsefalsefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseRegulatory hedge unrealized (loss) recognized on the balance sheet37false0so_RegulatoryHedgeUnrealizedGainsofalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse70000007falsetruefalsefalsefalse2truefalsefalse20000002falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalse20falsefalsefalse00falsefalsefalsetruefalse21falsefalsefalse00falsefalsefalsetruefalse22falsefalsefalse00falsefalsefalsetruefalse23falsefalsefalse00falsefalsefalsetruefalse24falsefalsefalse00falsefalsefalsetruefalse25falsefalsefalse00falsefalsefalsetruefalse26falsefalsefalse00falsefalsefalsetruefalse27falsefalsefalse00falsefalsefalsetruefalse28falsefalsefalse00falsefalsefalsetruefalse29falsefalsefalse00falsefalsefalsetruefalse30falsefalsefalse00falsefalsefalsetruefalse31truefalsefalse40000004falsetruefalsetruefalse32truefalsefalse10000001falsetruefalsetruefalse33truefalsefalse30000003falsetruefalsetruefalse34truefalsefalse10000001falsetruefalsetruefalse35falsefalsefalse00falsefalsefalsetruefalse36falsefalsefalse00falsefalsefalsetruefalse37falsefalsefalse00falsefalsefalsetruefalse38falsefalsefalse00falsefalsefalsetruefalse39falsefalsefalse00falsefalsefalsetruefalse40falsefalsefalse00falsefalsefalsetruefalse41falsefalsefalse00falsefalsefalsetruefalse42falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseRegulatory hedge unrealized gain recognized on the balance sheet4230Derivatives (Details)MillionsUnKnownUnKnownUnKnowntruetrue