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SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE 3 (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Common Stock, Shares Authorized 750,000,000us-gaap_CommonStockSharesAuthorized 750,000,000us-gaap_CommonStockSharesAuthorized  
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]      
Preferred Stock, Shares Authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized  
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, Shares, Outstanding, Beginning Balance 244,461,327us-gaap_CommonStockSharesOutstanding 242,368,836us-gaap_CommonStockSharesOutstanding 239,934,681us-gaap_CommonStockSharesOutstanding
Stock Issued During Period, Shares, Savings Plan Issuance 398,042sre_StockIssuedDuringPeriodSharesSavingsPlanIssuance 0sre_StockIssuedDuringPeriodSharesSavingsPlanIssuance 0sre_StockIssuedDuringPeriodSharesSavingsPlanIssuance
Shares Held In Employee Stock Ownership Plan, Released 0sre_SharesHeldInEmployeeStockOwnershipPlanReleased [1] 0sre_SharesHeldInEmployeeStockOwnershipPlanReleased [1] 153,625sre_SharesHeldInEmployeeStockOwnershipPlanReleased [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 699,783us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,237,348us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,876,303us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 21,121us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 2,580us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Stock Issued During Period, Shares, Dividend Reinvestment Plan 205,203us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan [2] 0us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan [2] 0us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan [2]
Stock Issued During Period, Shares, Restricted Stock Units, Vesting 989,027sre_StockIssuedDuringPeriodSharesRestrictedStockUnitsVesting [3] 1,491,170sre_StockIssuedDuringPeriodSharesRestrictedStockUnitsVesting [3] 683,416sre_StockIssuedDuringPeriodSharesRestrictedStockUnitsVesting [3]
Stock Repurchased and Retired During Period, Shares 422,498us-gaap_StockRepurchasedAndRetiredDuringPeriodShares [4] 657,148us-gaap_StockRepurchasedAndRetiredDuringPeriodShares [4] 281,769us-gaap_StockRepurchasedAndRetiredDuringPeriodShares [4]
Common Stock, Shares, Outstanding, Ending Balance 246,330,884us-gaap_CommonStockSharesOutstanding 244,461,327us-gaap_CommonStockSharesOutstanding 242,368,836us-gaap_CommonStockSharesOutstanding
[1]
We released the last shares from the ESOP in April 2012. These shares were unallocated and therefore excluded from the computation of EPS.
[2]
Participants in the Direct Stock Purchase Plan may reinvest dividends to purchase newly issued shares.
[3]
Includes dividend equivalents.
[4]
From time to time, we purchase shares of our common stock from restricted stock plan participants who elect to sell a sufficient number of vesting restricted shares or units to meet minimum statutory tax withholding requirements.