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SHARE-BASED COMPENSATION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-Based Compensation (Details) [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 302,478    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,555,427    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated Share-based Compensation Expense $ 44 $ 34 $ 34
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (18) (13) (13)
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax 26 21 21
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax, Per Basic Share $ 0.11 $ 0.09 $ 0.09
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax, Per Diluted Share $ 0.11 $ 0.08 $ 0.08
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 4 3 5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance 5,630,472    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 44.79    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 958,126    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 29.41    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 23 22 45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 41,375    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 57.75    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 4,630,971 5,630,472  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period $ 47.85 $ 44.79  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term, End of Period 4.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 40    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 4,615,468    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 47.83    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4.8    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 40    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 3,542,346    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 46.56    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 4.2    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value 35    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 28    
Share-Based Compensation, Nonqualified Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   19.00% 18.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.60% 1.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   2.80% 3.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5.5 5.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 7.92 $ 5.29
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards 1    
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards, Weighted Average Period of Recognition 1.7    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 7 8 9
Share-Based Compensation, Restricted Stock Awards And Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 27.00% 26.00% 25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.50% 2.10% 1.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 3.00% 2.80% 3.20%
Share-Based Compensation, Restricted Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 787,973    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period $ 36.73    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 11,876    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 52.96   $ 40.34
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 775,573    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 36.67    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 24,276 787,973  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, End of Period $ 46.51 $ 36.73  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Number 24,276    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Weighted Average Grant Date Fair Value $ 46.51    
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards 1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 28 4 27
Share-Based Compensation, Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 2,231,325    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period $ 43.46    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,089,223    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 42.35 $ 44.44 $ 35.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 10,336    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 50.40    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 17,700    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 42.34    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 3,292,512 [1] 2,231,325  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, End of Period $ 43.08 $ 43.46  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Number 3,231,843    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Weighted Average Grant Date Fair Value $ 43.10    
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards 24    
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards, Weighted Average Period of Recognition 2.3    
San Diego Gas and Electric Company and Subsidiary [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated Share-based Compensation Expense 8 9 6
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 3 2 3
Southern California Gas Company [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated Share-based Compensation Expense 9 8 7
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 1 $ 1 $ 2
[1] Each unit represents the right to receive one share of our common stock if applicable performance conditions are satisfied. Up to an additional 50% of the shares represented by the units may be issued if Sempra Energy exceeds target performance conditions.