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SEGMENT INFORMATION (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue $ 11,035,000,000us-gaap_Revenues $ 10,557,000,000us-gaap_Revenues $ 9,647,000,000us-gaap_Revenues
Segment reporting information, Percentage of Total Consolidated Revenues 100.00%sre_SegmentReportingInformationPercentageOfRevenues 100.00%sre_SegmentReportingInformationPercentageOfRevenues 100.00%sre_SegmentReportingInformationPercentageOfRevenues
Segment reporting information, Interest Expense 554,000,000us-gaap_InterestExpense 559,000,000us-gaap_InterestExpense 493,000,000us-gaap_InterestExpense
Segment reporting information, Interest Income 22,000,000us-gaap_InvestmentIncomeInterest 20,000,000us-gaap_InvestmentIncomeInterest 24,000,000us-gaap_InvestmentIncomeInterest
Segment reporting information, Depreciation and Amortization 1,156,000,000us-gaap_DepreciationDepletionAndAmortization 1,113,000,000us-gaap_DepreciationDepletionAndAmortization 1,090,000,000us-gaap_DepreciationDepletionAndAmortization
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 100.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization 100.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization 100.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
Segment reporting information, Income Tax Expense (Benefit) 300,000,000us-gaap_IncomeTaxExpenseBenefit 366,000,000us-gaap_IncomeTaxExpenseBenefit 59,000,000us-gaap_IncomeTaxExpenseBenefit
Segment reporting information, earnings (losses) 1,161,000,000sre_SegmentReportingInformationEarningsLosses 1,001,000,000sre_SegmentReportingInformationEarningsLosses 859,000,000sre_SegmentReportingInformationEarningsLosses
Segment reporting information, Percentage of Consolidated Earnings (Losses) 100.00%sre_SegmentReportingInformationPercentageOfEarningsLosses 100.00%sre_SegmentReportingInformationPercentageOfEarningsLosses 100.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 3,123,000,000us-gaap_AdditionsToOtherAssetsAmount 2,572,000,000us-gaap_AdditionsToOtherAssetsAmount 2,956,000,000us-gaap_AdditionsToOtherAssetsAmount
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 100.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment 100.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment 100.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
Segment reporting information, Assets 39,732,000,000us-gaap_Assets 37,244,000,000us-gaap_Assets 36,499,000,000us-gaap_Assets
Segment reporting information, Percentage of Consolidated Assets 100.00%sre_SegmentReportingInformationPercentageOfAssets 100.00%sre_SegmentReportingInformationPercentageOfAssets 100.00%sre_SegmentReportingInformationPercentageOfAssets
S D G E Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 4,329,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 4,066,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 3,694,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 39.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 39.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 38.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Interest Expense 202,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 197,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 173,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Interest Income 0us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 1,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 0us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Depreciation and Amortization 530,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 494,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 490,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 46.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 44.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 45.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Income Tax Expense (Benefit) 270,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 191,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 190,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, earnings (losses) 507,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 [1] 404,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 [1] 484,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 [1]
Segment reporting information, Percentage of Consolidated Earnings (Losses) 44.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 41.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 56.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 1,100,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 978,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 1,237,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 35.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 38.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 42.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Assets 16,296,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 15,377,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 14,744,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment reporting information, Percentage of Consolidated Assets 41.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 41.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 40.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Segment Reporting Information, Intersegment Revenues 10,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 10,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 8,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
So Cal Gas Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 3,855,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 3,736,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 3,282,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 35.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 35.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 34.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Interest Expense 69,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 69,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 68,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Depreciation and Amortization 431,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 383,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 362,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 37.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 35.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 33.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Income Tax Expense (Benefit) 139,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 116,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 79,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, earnings (losses) 332,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 [2] 364,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 [2] 289,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 [2]
Segment reporting information, Percentage of Consolidated Earnings (Losses) 29.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 37.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 34.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 1,104,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 762,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 639,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 35.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 30.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 22.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Assets 10,461,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 9,147,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 9,071,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment reporting information, Percentage of Consolidated Assets 26.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 25.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 25.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Segment Reporting Information, Intersegment Revenues 69,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 70,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 46,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
All Other Segments [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Interest Expense 241,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 241,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 251,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Interest Income 1,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 0us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 4,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Depreciation and Amortization 10,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 12,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 11,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 1.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 1.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 1.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Income Tax Expense (Benefit) (108,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (89,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (141,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, earnings (losses) (173,000,000)sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (168,000,000)sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (55,000,000)sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Percentage of Consolidated Earnings (Losses) (15.00%)sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (17.00%)sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 (6.00%)sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 18,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 2,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 4,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 1.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 0.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 0.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Assets 895,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 838,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 818,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Segment reporting information, Percentage of Consolidated Assets 2.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 2.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 2.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Adjustments and Intercompany Eliminations Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue (3,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember		 (2,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember		 (2,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 0.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember		 0.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember		 0.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_AdjustmentsAndIntercompanyEliminationsSegmentMember
Intercompany Eliminations Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Interest Expense (124,000,000)us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember		 (131,000,000)us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember		 (159,000,000)us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember
Segment reporting information, Interest Income (113,000,000)us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember		 (105,000,000)us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember		 (58,000,000)us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntercompanyEliminationsSegmentMember
Intersegment Revenues Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue (512,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember		 [3] (403,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember		 [3] (372,000,000)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember		 [3]
Segment reporting information, Percentage of Total Consolidated Revenues (5.00%)sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember		 (4.00%)sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember		 (4.00%)sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentRevenuesSegmentMember
Intersegment Receivables Segment [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Segment reporting information, Assets (2,561,000,000)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember		 (3,314,000,000)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember		 (1,619,000,000)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember
Segment reporting information, Percentage of Consolidated Assets (6.00%)sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember		 (9.00%)sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember		 (4.00%)sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_IntersegmentReceivablesSegmentMember
Sempra South American Utilities Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 1,534,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 1,495,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 1,441,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 14.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 14.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 15.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Interest Expense 33,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 27,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 32,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Interest Income 14,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 14,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 15,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Depreciation and Amortization 55,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 59,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 56,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 5.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 5.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 5.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Income Tax Expense (Benefit) 58,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 67,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 78,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, earnings (losses) 172,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 153,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 164,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Percentage of Consolidated Earnings (Losses) 15.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 15.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 19.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 174,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 200,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 183,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 6.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 8.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Assets 3,379,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 3,531,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 3,310,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Segment reporting information, Percentage of Consolidated Assets 9.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 10.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 9.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Sempra Mexico Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 818,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 675,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 605,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 8.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Interest Expense 17,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 17,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 8,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Interest Income 4,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 2,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 2,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Depreciation and Amortization 64,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 63,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 62,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 6.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Income Tax Expense (Benefit) 5,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 60,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 73,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, earnings (losses) 192,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 122,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 157,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Percentage of Consolidated Earnings (Losses) 16.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 12.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 18.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 325,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 371,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 45,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 10.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 14.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 2.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Assets 3,488,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 3,246,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 2,591,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment reporting information, Percentage of Consolidated Assets 9.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 9.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 7.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Segment Reporting Information, Intersegment Revenues 91,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 91,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 108,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Sempra Renewables Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 35,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 82,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 68,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 0.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 1.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 1.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Interest Expense 5,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 23,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 22,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Interest Income 1,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 20,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 6,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Depreciation and Amortization 5,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 21,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 16,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 0.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 2.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 1.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Income Tax Expense (Benefit) (44,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 (19,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 (63,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, earnings (losses) 81,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 62,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 61,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Percentage of Consolidated Earnings (Losses) 7.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 7.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 190,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 176,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 717,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 6.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 7.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 24.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Assets 1,338,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 1,219,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 2,439,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Segment reporting information, Percentage of Consolidated Assets 3.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 3.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 7.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Sempra Natural Gas Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment reporting information, Revenue 979,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 908,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 931,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Percentage of Total Consolidated Revenues 9.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 9.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 10.00%sre_SegmentReportingInformationPercentageOfRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Interest Expense 111,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 116,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 98,000,000us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Interest Income 115,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 88,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 55,000,000us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Depreciation and Amortization 61,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 81,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 93,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Percentage of Consolidated Depreciation and Amortization 5.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 7.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 9.00%sre_SegmentReportingInformationPercentageOfDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Income Tax Expense (Benefit) (20,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 40,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 (157,000,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, earnings (losses) 50,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 64,000,000sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 (241,000,000)sre_SegmentReportingInformationEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Percentage of Consolidated Earnings (Losses) 4.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 6.00%sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 (28.00%)sre_SegmentReportingInformationPercentageOfEarningsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment Reporting Information, Additional Information [Abstract]      
Additions to noncurrent assets 212,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 83,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 131,000,000us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment 7.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 3.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 4.00%sre_SegmentReportingInformationPercentageOfExpendituresForPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Assets 6,436,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 7,200,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 5,145,000,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment reporting information, Percentage of Consolidated Assets 16.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 19.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 14.00%sre_SegmentReportingInformationPercentageOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Segment Reporting Information, Intersegment Revenues $ 342,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 $ 232,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 $ 210,000,000sre_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
[1]
For 2013, amount is after preferred dividends and call premium on preferred stock. For 2012, amount is after preferred dividends.
[2]
After preferred dividends.
[3]
Revenues for reportable segments include intersegment revenues of $10 million, $69 million, $91 million and $342 million for 2014, $10 million, $70 million, $91 million and $232 million for 2013, $8 million, $46 million, $108 million and $210 million for 2012 for SDG&E, SoCalGas, Sempra Mexico and Sempra Natural Gas, respectively.