v2.4.1.9

FAIR VALUE MEASUREMENTS 3 (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 107 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | $ 99 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Realized and unrealized gains (losses) | 6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 | 1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Allocated transmission instruments | 0 sre_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAllocatedTransmissionInstruments | 1 sre_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAllocatedTransmissionInstruments
Settlements | (11)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements | (6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Balance at end of period | 102 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | 95 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Change in unrealized gains (losses) relating to instruments still held at period end | 1 sre_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInCostOfElectricFuelAndPurchasedPower | 0 sre_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInCostOfElectricFuelAndPurchasedPower
CRR Auction Rate Per MWh, Minimum | (16)sre_CRRAuctionRatePerMWHourMinimum | (6)sre_CRRAuctionRatePerMWHourMinimum
CRR Auction Rate Per MWh, Maximum | $ 8 sre_CRRAuctionRatePerMWHourMaximum | $ 12 sre_CRRAuctionRatePerMWHourMaximum

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- Definition CRR auction rate per MWh, maximum. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition CRR auction rate per MWh, minimum. + References No definition available. + Details
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Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Change in unrealized gains (losses) relating to instruments still held at period end. + References No definition available. + Details
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Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset allocated transmission instruments. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Period Type: | instant