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RECENT INVESTMENT ACTIVITY (Details) (Copper Mountain Solar 3 [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Mar. 13, 2014
Copper Mountain Solar 3 [Member]
 
Deconsolidation of business [Line Items]  
Proceeds from sale, net of transaction costs $ 68sre_ProceedsFromSaleNetTransactionCosts
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Cash (2)us-gaap_CashDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Property, plant and equipment, net (247)sre_PropertyPlantAndEquipmentDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Other assets (11)sre_OtherAssetsDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Accounts payable and accrued expenses 82sre_AccountsPayableAndAccruedExpensesDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Long-term debt including current portion 97sre_LongTermDebtIncludingCurrentPortionDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Other liabilities 3sre_OtherLiabilitiesDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Accumulated other comprehensive income (2)sre_AccumulatedOtherComprehensiveIncomeDivestedFromDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Gain on sale of equity interests (27)us-gaap_DeconsolidationGainOrLossAmount
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member
Equity method investments upon deconsolidation $ (39)sre_EquityMethodInvestmentsUponDeconsolidation
/ sre_DeconsolidationOfBusinessAxis
= sre_CopperMountainSolar3Member