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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2011
Schedule Of Fair Value Of Financial Instruments [Abstract]  
Schedule Of Fair Value of Financial Instruments
FAIR VALUE OF FINANCIAL INSTRUMENTS
(Dollars in millions)
  December 31, 2011December 31, 2010
  CarryingFairCarryingFair
  AmountValueAmountValue
Sempra Energy Consolidated:        
Investments in affordable housing partnerships(1)$ 21$ 48$ 28$ 58
Total long-term debt(2)  9,826  11,047  8,330  8,883
Due to unconsolidated affiliate(3)  ―  ―  2  2
Preferred stock of subsidiaries  99  106  179  166
SDG&E:        
Total long-term debt(4)$ 3,895$ 4,288$ 3,305$ 3,300
Contingently redeemable preferred stock  79  86  79  78
SoCalGas:        
Total long-term debt(5)$ 1,313$ 1,506$ 1,566$ 1,638
Preferred stock  22  23  22  21
(1)We discuss our investments in affordable housing partnerships in Note 4.
(2)Before reductions for unamortized discount (net of premium) of $16 million at December 31, 2011 and $22 million at December 31, 2010, and excluding capital leases of $204 million at December 31, 2011 and $221 million at December 31, 2010, and commercial paper classified as long-term debt of $400 million at December 31, 2011 and $800 million at December 31, 2010. We discuss our long-term debt in Note 5.
(3)Note payable was extinguished due to the increase in our ownership of Chilquinta Energía to 100% in 2011.
(4)Before reductions for unamortized discount of $11 million at December 31, 2011 and $9 million at December 31, 2010, and excluding capital leases of $193 million at December 31, 2011 and $202 million at December 31, 2010.
(5)Before reductions for unamortized discount of $3 million at both December 31, 2011 and 2010, and excluding capital leases of $11 million at December 31, 2011 and $19 million at December 31, 2010.
Schedule Of Cash Collateral Not Offset With Derivative Instruments [Abstract]  
Schedule Of Fair Value of Cash Collateral Receivables Not Offset on the Consolidated Balance Sheets
 December 31,
(Dollars in millions)20112010
Sempra Energy Consolidated$ 20$ 32
SDG&E  10  25
SoCalGas  2  3
Schedule Of Recurring Fair Value Assets Liabilities [Abstract]  
Schedule Of Recurring Fair Value Measures
RECURRING FAIR VALUE MEASURES ― SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
  At fair value as of December 31, 2011
         Collateral  
   Level 1 Level 2 Level 3 Netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 468$ ―$ ―$ ―$ 468
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  92  78  ―  ―  170
Municipal bonds   ―  77  ―  ―  77
Other securities   ―  78  ―  ―  78
Total debt securities  92  233  ―  ―  325
Total nuclear decommissioning trusts(1)  560  233  ―  ―  793
Interest rate instruments  ―  66  ―  ―  66
Commodity contracts subject to rate recovery  10  1  23  ―  34
Commodity contracts not subject to rate recovery  15  35  ―  (2)  48
Investments  5  ―  ―  ―  5
Total$ 590$ 335$ 23$ (2)$ 946
Liabilities:          
Interest rate instruments$ 1$ 124$ ―$ ―$ 125
Commodity contracts subject to rate recovery  61  13  ―  (61)  13
Commodity contracts not subject to rate recovery  1  52  ―  (4)  49
Total$ 63$ 189$ ―$ (65)$ 187
            
 At fair value as of December 31, 2010
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 460$ ―$ ―$ ―$ 460
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  144  30  ―  ―  174
Municipal bonds  ―  100  ―  ―  100
Other securities  ―  25  ―  ―  25
Total debt securities  144  155  ―  ―  299
Total nuclear decommissioning trusts(1)  604  155  ―  ―  759
Interest rate instruments  ―  34  ―  ―  34
Commodity contracts subject to rate recovery  25  1  2  ―  28
Commodity contracts not subject to rate recovery  9  66  ―  (22)  53
Investments  1  ―  ―  ―  1
Total$ 639$ 256$ 2$ (22)$ 875
Liabilities:          
Interest rate instruments$ ―$ 82$ ―$ ―$ 82
Commodity contracts subject to rate recovery  60  8  ―  (60)  8
Commodity contracts not subject to rate recovery  ―  67  ―  ―  67
Total$ 60$ 157$ ―$ (60)$ 157
(1)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES ― SDG&E
(Dollars in millions)
 At fair value as of December 31, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 468$ ―$ ―$ ―$ 468
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  92  78  ―  ―  170
Municipal bonds   ―  77  ―  ―  77
Other securities   ―  78  ―  ―  78
Total debt securities  92  233  ―  ―  325
Total nuclear decommissioning trusts(1)  560  233  ―  ―  793
Commodity contracts subject to rate recovery  9  ―  23  ―  32
Commodity contracts not subject to rate recovery  1  ―  ―  ―  1
Total$ 570$ 233$ 23$ ―$ 826
           
Liabilities:          
Interest rate instruments$ ―$ 81$ ―$ ―$ 81
Commodity contracts subject to rate recovery  61  12  ―  (61)  12
Total$ 61$ 93$ ―$ (61)$ 93
           
 At fair value as of December 31, 2010
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 460$ ―$ ―$ ―$ 460
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  144  30  ―  ―  174
Municipal bonds   ―  100  ―  ―  100
Other securities   ―  25  ―  ―  25
Total debt securities  144  155  ―  ―  299
Total nuclear decommissioning trusts(1)  604  155  ―  ―  759
Commodity contracts subject to rate recovery  24  ―  2  ―  26
Commodity contracts not subject to rate recovery  2  ―  ―  ―  2
Total$ 630$ 155$ 2$ ―$ 787
           
Liabilities:          
Interest rate instruments$ ―$ 58$ ―$ ―$ 58
Commodity contracts subject to rate recovery  60  2  ―  (60)  2
Total$ 60$ 60$ ―$ (60)$ 60
(1)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES ― SOCALGAS
(Dollars in millions)
 At fair value as of December 31, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 1$ 1$ ―$ ―$ 2
Commodity contracts not subject to rate recovery  2  ―  ―  ―  2
Total$ 3$ 1$ ―$ ―$ 4
           
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
           
 At fair value as of December 31, 2010
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Interest rate instruments$ ―$ 3$ ―$ ―$ 3
Commodity contracts subject to rate recovery  1  1  ―  ―  2
Commodity contracts not subject to rate recovery  3  ―  ―  ―  3
Total$ 4$ 4$ ―$ ―$ 8
Schedule Of Recurring Fair Value Assets Liabilities Unobservable Input Reconciliation [Abstract]  
Schedule Of Recurring Fair Value Measures Level 3 Rollforward
LEVEL 3 RECONCILIATIONS
(Dollars in millions)
 Years ended December 31,
 201120102009
Balance as of January 1$ 2$ 10$ 27
Realized and unrealized gains (losses)  32  (16)  (31)
Allocated transmission instruments  7  8  15
Settlements  (18)  ―  (1)
Balance as of December 31$ 23$ 2$ 10
Change in unrealized gains or losses relating to       
instruments still held at December 31$ 17$ (9)$ (16)