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OTHER FINANCIAL DATA - COMPREHENSIVE INCOME AND EQUITY (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  $ 9,238[1]$ 9,251
Comprehensive income, net of income tax    
Net income326[2]127[2]1,092[2]432[2]
Foreign currency translation adjustments(139)53(110)32
Reclassification to net income of foreign currency translation adjustment related to equity method investments  (54)[3] 
Financial instruments(39)(2)(52)(7)
Available-for-sale securities 4 1
Net actuarial gain1184
Comprehensive income (loss)149183884462
Purchase of noncontrolling interest in subsidiary  (43) 
Share-based compensation expense  3631
Common stock dividends declared  (346)(287)
Preferred dividends of subsidiaries(1)(2)(6)(7)
Issuance of common stock  2253
Tax benefit related to share-based compensation  63
Repurchases of common stock  (18)(502)
Acquisition of South American entities  279 
Redemption of preferred stock of subidiary  (80) 
Common stock released from ESOP  1513
Equity contributed by noncontrolling interests  6 
Distributions to noncontrolling interests  (9)(10)
Equity, end of period9,9849,0079,9849,007
Other Comprehensive Income (Loss), Tax [Abstract]    
Financial instruments, income tax expense (benefit)(11)(1)(11)(7)
Foreign currency translation adjustments(1) (1) 
Available-for-sale securities, income tax expense (benefit)   (1)
Net actuarial gain, income tax expense (benefit)1153
San Diego Gas and Electric Company and Subsidiary [Member] | Total Shareholders' Equity
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  3,1082,739
Comprehensive income, net of income tax    
Net income115[4]108277[4]268
Net actuarial gain1[4] 1[4]1
Comprehensive income (loss)116[4]108278[4]269
Preferred stock dividends declared  (4)(4)
Capital contribution200 200 
Equity, end of period3,5823,0043,5823,004
Southern California Gas Company [Member] | Total Shareholders' Equity
    
Comprehensive income, net of income tax    
Net income81[4]78209[4]213
Financial instruments1[4]12[4]2
Comprehensive income (loss)82[4]79211[4]215
Other Comprehensive Income (Loss), Tax [Abstract]    
Financial instruments, income tax expense (benefit) 1[4]1[4]2[4]
Total Shareholders' Equity
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  9,0279,007
Comprehensive income, net of income tax    
Net income297[2],[4]133[2]1,071[2],[4]466[2]
Foreign currency translation adjustments(132)[4]53(109)[4]32
Reclassification to net income of foreign currency translation adjustment related to equity method investments  (54)[3],[4] 
Financial instruments(14)[4](3)(18)[4](12)
Available-for-sale securities 4 1
Net actuarial gain1[4]18[4]4
Comprehensive income (loss)152[4]188898[4]491
Purchase of noncontrolling interest in subsidiary  (4) 
Share-based compensation expense  3631
Common stock dividends declared  (346)(287)
Preferred dividends of subsidiaries  (6)(7)
Issuance of common stock  2253
Tax benefit related to share-based compensation  63
Repurchases of common stock  (18)(502)
Common stock released from ESOP  1513
Equity, end of period9,6308,8029,6308,802
Other Comprehensive Income (Loss), Tax [Abstract]    
Financial instruments, income tax expense (benefit)(11)[4](1)[4](11)[4](7)[4]
Foreign currency translation adjustments(1)[4] (1)[4] 
Available-for-sale securities, income tax expense (benefit)   (1)[4]
Net actuarial gain, income tax expense (benefit)1[4]1[4]5[4]3[4]
San Diego Gas and Electric Company and Subsidiary [Member] | Noncontrolling Interests
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  113146
Comprehensive income, net of income tax    
Net income21(5)6(34)
Financial instruments(25)1(34)5
Comprehensive income (loss)(4)(4)(28)(29)
Equity contributed by noncontrolling interests  6 
Distributions to noncontrolling interests   (10)
Equity, end of period9110791107
Noncontrolling Interests
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  211244
Comprehensive income, net of income tax    
Net income29[2](6)[2]21[2](34)[2]
Foreign currency translation adjustments(7) (1) 
Financial instruments(25)1(34)5
Comprehensive income (loss)(3)(5)(14)(29)
Purchase of noncontrolling interest in subsidiary  (39) 
Acquisition of South American entities  279 
Redemption of preferred stock of subidiary  (80) 
Equity contributed by noncontrolling interests  6 
Distributions to noncontrolling interests  (9)(10)
Equity, end of period354205354205
San Diego Gas and Electric Company and Subsidiary [Member]
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  3,221[1]2,885
Comprehensive income, net of income tax    
Net income136103283234
Financial instruments(25)1(34)5
Net actuarial gain1 11
Comprehensive income (loss)112104250240
Preferred stock dividends declared  (4)(4)
Capital contribution200 200 
Equity contributed by noncontrolling interests  6 
Distributions to noncontrolling interests   (10)
Equity, end of period3,6733,1113,6733,111
Southern California Gas Company [Member]
    
Comprehensive Income And Equity Disclosure [Line Items]    
Equity, beginning of period  1,955 
Comprehensive income, net of income tax    
Net income8178209213
Financial instruments1122
Comprehensive income (loss)8279211215
Equity, end of period2,115 2,115 
Other Comprehensive Income (Loss), Tax [Abstract]    
Financial instruments, income tax expense (benefit) $ 1$ 1$ 2
[1]Derived from audited financial statements.
[2]Before preferred dividends of subsidiaries.
[3]Related to the acquisition of Chilquinta Energía and Luz del Sur.
[4]Shareholders' equity of Sempra Energy Consolidated, SDG&E or SoCalGas as indicated in left margin.