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No authoritative reference available. false 16 Estimated distributions of cash, accounts receivable and net margin, minimum 4 sre_EstimatedCashDistributionsFromJointVentureRelatedToSalesOfBusinessesMinimum sre false debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 500000000 500000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 17 Estimated distributions of cash, accounts receivable and net margin, maximum 4 sre_EstimatedCashDistributionsFromJointVentureRelatedToSalesOfBusinessesMaximum sre false debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 600000000 600000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 18 Loss on impairment of RBS Sempra Commodities LLP 2 sre_InvestmentInJointVentureOtherThanTemporaryImpairment sre false debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 305000000 305000000 false false false 2 false false false false 0 0 false false false 3 false true false false 305000000 305000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 19 Loss on impairment of RBS Sempra Commodities LLP, after tax 2 sre_InvestmentInJointVentureOtherThanTemporaryImpairmentAfterTax sre false debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 139000000 139000000 false false false 2 false false false false 0 0 false false false 3 false true false false 139000000 139000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 21 Summarized Financial Information for RBS Sempra Commodities 2 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeStatementAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 22 Summarized financial information for RBS Sempra Commodities - Gross revenues and fee income 3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetSalesOrGrossRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 72000000 72000000 false false false 2 false true false false 291000000 291000000 false false false 3 false true false false 466000000 466000000 false false false 4 false true false false 1167000000 1167000000 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include net sales or gross revenues. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph d Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 false 23 Summarized financial information for RBS Sempra Commodities - Gross profit 3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 74000000 74000000 false false false 2 false true false false 268000000 268000000 false false false 3 false true false false 446000000 446000000 false false false 4 false true false false 1096000000 1096000000 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include gross profit or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph d Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 false 24 Summarized financial information for RBS Sempra Commodities - Income (loss) from continuing operations 3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -7000000 -7000000 false false false 2 false true false false 115000000 115000000 false false false 3 false true false false -20000000 -20000000 false false false 4 false true false false 504000000 504000000 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include income or loss from continuing operations before extraordinary items and cumulative effect of a change in accounting principle. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph d Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 false 25 Summarized financial information for RBS Sempra Commodities - Partnership net income (loss) 3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -7000000 -7000000 false false false 2 false true false false 115000000 115000000 false false false 3 false true false false -20000000 -20000000 false false false 4 false true false false 504000000 504000000 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include net income or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph d Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 false 27 Schedule of Equity Method Investments [Line Items] 2 us-gaap_ScheduleOfEquityMethodInvestmentsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 29 Contributions to equity method investees 3 us-gaap_PaymentsToAcquireEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false true false false 65000000 65000000 true false false 10 false true false false 315000000 315000000 true false false 11 false true false false 527000000 527000000 true false false 12 false true false false 235000000 235000000 true false false xbrli:monetaryItemType monetary The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b false 31 Unrecorded arbitration award related to Argentine investments 1 us-gaap_GainContingencyUnrecordedAmount us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 172000000 172000000 false false false 2 false false false false 0 0 false false false 3 false true false false 172000000 172000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 17 false 32 Gain related to litigation settlement 1 us-gaap_LitigationSettlementGross us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 48000000 48000000 false false false 2 false false false false 0 0 false false false 3 false true false false 48000000 48000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period. 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The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph h false 35 Available-for-sale Securities [Line Items] 2 sre_AvailableForSaleSecuritiesLineItems sre false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 38 Industrial Development Bonds, Interest Rate, Stated Percentage 3 sre_IndustrialDevelopmentBondsInterestRateStatedPercentage sre false na instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0.05875 0.05875 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure No definition available. 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