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PREFERRED STOCK (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Preferred Stock [Line Items]      
Preferred Stock, Shares Authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized  
San Diego Gas and Electric Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Authorized 45,000,000us-gaap_PreferredStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
   
Preferred stock redeemed   $ 82sre_PreferredStockRedeemed
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
 
Accrued preferred stock dividends at redemption date   1sre_AccruedPreferredStockDividendsAtRedemptionDate
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
 
Contingently redeemable preferred stock, call premium 0us-gaap_PreferredStockRedemptionPremium
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
3us-gaap_PreferredStockRedemptionPremium
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
0us-gaap_PreferredStockRedemptionPremium
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
San Diego Gas and Electric Company [Member] | Maximum [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Redemption Price Per Share   $ 20.25us-gaap_PreferredStockRedemptionPricePerShare
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
San Diego Gas and Electric Company [Member] | Minimum [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Redemption Price Per Share   $ 26us-gaap_PreferredStockRedemptionPricePerShare
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Southern California Gas Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Authorized 1,000,000us-gaap_PreferredStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
   
So Cal Gas Series Preferred Stock [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Authorized 5,000,000us-gaap_PreferredStockSharesAuthorized
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasSeriesPreferredStockMember
   
So Cal Gas Series Preferred Stock [Member] | Southern California Gas Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Authorized 5,000,000us-gaap_PreferredStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasSeriesPreferredStockMember
   
Preferred Stock, Value, Outstanding 22us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasSeriesPreferredStockMember
22us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasSeriesPreferredStockMember
 
Twenty Five Dollar Par, Six Percent Series [Member] | Southern California Gas Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Par or Stated Value Per Share $ 25us-gaap_PreferredStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesMember
   
Preferred Stock, Shares Outstanding 79,011us-gaap_PreferredStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesMember
   
Preferred Stock, Value, Outstanding 3us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesMember
3us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesMember
 
Twenty Five Dollar Par, Six Percent Seriesa [Member] | Utility Subsidiaries [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Outstanding 783,032us-gaap_PreferredStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_UtilitySubsidiariesMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesaMember
   
Twenty Five Dollar Par, Six Percent Seriesa [Member] | Southern California Gas Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Par or Stated Value Per Share $ 25us-gaap_PreferredStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesaMember
   
Preferred Stock, Value, Outstanding 19us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesaMember
19us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesaMember
 
Preferred Stock, Liquidation Preference Per Share $ 25us-gaap_PreferredStockLiquidationPreference
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_TwentyFiveDollarParSixPercentSeriesaMember
   
So Cal Gas Preferred Stock Owned By Pacific Enterprises [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Value, Outstanding (2)us-gaap_PreferredStockValueOutstanding
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasPreferredStockOwnedByPacificEnterprisesMember
(2)us-gaap_PreferredStockValueOutstanding
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasPreferredStockOwnedByPacificEnterprisesMember
 
So Cal Gas Preferred Stock Owned By Pacific Enterprises [Member] | Southern California Gas Company [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Shares Outstanding 50,970us-gaap_PreferredStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
/ sre_PreferredStockBySeriesAxis
= sre_SoCalGasPreferredStockOwnedByPacificEnterprisesMember
   
Preferred Stock Of Subsidiaries [Member]      
Preferred Stock [Line Items]      
Preferred Stock, Value, Outstanding $ 20us-gaap_PreferredStockValueOutstanding
/ sre_PreferredStockBySeriesAxis
= sre_PreferredStockOfSubsidiariesMember
$ 20us-gaap_PreferredStockValueOutstanding
/ sre_PreferredStockBySeriesAxis
= sre_PreferredStockOfSubsidiariesMember