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OTHER FINANCIAL DATA - INVENTORY (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage $ 246,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage $ 113,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
Energy Related Inventory, LNG 14,000,000sre_EnergyRelatedInventoryLNG 8,000,000sre_EnergyRelatedInventoryLNG
Energy Related Inventory, Materials And Supplies 136,000,000us-gaap_OtherInventorySupplies 166,000,000us-gaap_OtherInventorySupplies
Inventories 396,000,000us-gaap_InventoryNet 287,000,000us-gaap_InventoryNet
S D G E Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 8,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 3,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Energy Related Inventory, LNG 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Energy Related Inventory, Materials And Supplies 65,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 83,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
Inventories 73,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember		 86,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SDGESegmentMember
So Cal Gas Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 155,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 42,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Energy Related Inventory, LNG 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Energy Related Inventory, Materials And Supplies 26,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 27,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Inventories 181,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember		 69,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SoCalGasSegmentMember
Sempra South American Utilities Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Energy Related Inventory, LNG 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Energy Related Inventory, Materials And Supplies 33,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 40,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Inventories 33,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember		 40,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraSouthAmericanUtilitiesSegmentMember
Sempra Mexico Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Energy Related Inventory, LNG 9,000,000sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 3,000,000sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Energy Related Inventory, Materials And Supplies 9,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 9,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Inventories 18,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember		 12,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraMexicoSegmentMember
Sempra Renewables Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 0us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Energy Related Inventory, LNG 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 0sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Energy Related Inventory, Materials And Supplies 2,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 2,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Inventories 2,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember		 2,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraRenewablesSegmentMember
Sempra Natural Gas Segment [Member]    
Inventories By Inventory Type [Line Items]    
Energy Related Inventory, Natural Gas in Storage 83,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 68,000,000us-gaap_EnergyRelatedInventoryNaturalGasInStorage
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Energy Related Inventory, LNG 5,000,000sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 5,000,000sre_EnergyRelatedInventoryLNG
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Energy Related Inventory, Materials And Supplies 1,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 5,000,000us-gaap_OtherInventorySupplies
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember
Inventories $ 89,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember		 $ 78,000,000us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= sre_SempraNaturalGasSegmentMember