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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Equity Method Investments in Joint Ventures, capitalized interest $ 17us-gaap_InterestCostsCapitalized $ 8us-gaap_InterestCostsCapitalized
Sempra Renewables [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments In Joint Ventures 17us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sre_SempraRenewablesMember		 12us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sre_SempraRenewablesMember
Cameron LNG [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments In Joint Ventures 3us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sre_CameronLNGMember		  
Equity Method Investments in Joint Ventures, capitalized interest $ 12us-gaap_InterestCostsCapitalized
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sre_CameronLNGMember