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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Jun. 30, 2011
Fair Value Measurements (Tables) [Abstract]  
Fair Value of Financial Instruments Table
FAIR VALUE OF FINANCIAL INSTRUMENTS
(Dollars in millions)
  June 30, 2011December 31, 2010
  CarryingFairCarryingFair
  AmountValueAmountValue
Sempra Energy Consolidated:        
Investments in affordable housing partnerships(1)$ 25$ 58$ 28$ 58
Total long-term debt(2)  9,400  10,001  8,330  8,883
Due to unconsolidated affiliate(3)  ―  ―  2  2
Preferred stock of subsidiaries  99  101  179  166
SDG&E:        
Total long-term debt(4)$ 3,300$ 3,346$ 3,305$ 3,300
Contingently redeemable preferred stock  79  80  79  78
SoCalGas:        
Total long-term debt(5)$ 1,312$ 1,380$ 1,566$ 1,638
Preferred stock  22  22  22  21
(1)We discuss our investments in affordable housing partnerships in Note 4 of the Notes to Consolidated Financial Statements in the Annual Report.
(2)Before reductions for unamortized discount of $22 million at both June 30, 2011 and December 31, 2010, and excluding capital leases of $214 million at June 30, 2011 and $221 million at December 31, 2010, and commercial paper classified as long-term debt of $200 million at June 30, 2011 and $800 million at December 31, 2010. We discuss our long-term debt in Note 6 above and Note 5 of the Notes to Consolidated Financial Statements in the Annual Report.
(3)Note payable was extinguished due to the increase in our ownership of Chilquinta Energía S.A. to 100% in the second quarter of 2011.
(4)Before reductions for unamortized discount of $9 million at both June 30, 2011 and December 31, 2010, and excluding capital leases of $198 million at June 30, 2011 and $202 million at December 31, 2010.
(5)Before reductions for unamortized discount of $2 million at June 30, 2011 and $3 million at December 31, 2010, and excluding capital leases of $15 million at June 30, 2011 and $19 million at December 31, 2010.
Nuclear Decommissioning Trusts Table
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
     Gross Gross Estimated
     Unrealized Unrealized Fair
   Cost Gains Losses Value
As of June 30, 2011:        
Debt securities        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies(1)$ 159$ 15$ (2)$ 172
Municipal bonds(2)  116  4  (2)  118
Other securities(3)  21  3  ―  24
Total debt securities  296  22  (4)  314
Equity securities  221  263  (1)  483
Cash and cash equivalents  11  ―  ―  11
Total $ 528$ 285$ (5)$ 808
As of December 31, 2010:        
Debt securities        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies$ 162$ 14$ (2)$ 174
Municipal bonds  101  2  (3)  100
Other securities  22  3  ―  25
Total debt securities  285  19  (5)  299
Equity securities  219  242  (1)  460
Cash and cash equivalents  10  ―  ―  10
Total $ 514$ 261$ (6)$ 769
(1)Maturity dates are 2011-2040.
(2)Maturity dates are 2013-2057.
(3)Maturity dates are 2011-2049.
Sales of Securities Table
SALES OF SECURITIES    
(Dollars in millions)    
 Three months ended June 30,Six months ended June 30,
 2011201020112010
Proceeds from sales$ 48$ 110$ 90$ 150
Gross realized gains  1  2  2  3
Gross realized losses  (1)  (5)  (2)  (7)
Fair Value of Cash Collateral Receivables Not Offset on the Condensed Consolidated Balance Sheets Table
 June 30,December 31,
(Dollars in millions)20112010
Sempra Energy Consolidated$ 30$ 32
SDG&E  18  25
SoCalGas  3  3
Recurring Fair Value Measures Table
RECURRING FAIR VALUE MEASURES -- SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
 At fair value as of June 30, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 483$ ―$ ―$ ―$ 483
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  144  28  ―  ―  172
Municipal bonds  ―  118  ―  ―  118
Other securities  ―  24  ―  ―  24
Total debt securities  144  170  ―  ―  314
Total nuclear decommissioning trusts(1)  627  170  ―  ―  797
Interest rate instruments  ―  39  ―  ―  39
Commodity contracts subject to rate recovery  21  1  3  ―  25
Commodity contracts not subject to rate recovery  14  48  ―  (4)  58
Investments  13  ―  ―  ―  13
Total$ 675$ 258$ 3$ (4)$ 932
Liabilities:          
Interest rate instruments$ ―$ 87$ ―$ ―$ 87
Commodity contracts subject to rate recovery  42  4  ―  (42)  4
Commodity contracts not subject to rate recovery  ―  51  ―  ―  51
Total$ 42$ 142$ ―$ (42)$ 142
           
 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 June 30, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 483$ ―$ ―$ ―$ 483
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  144  28  ―  ―  172
Municipal bonds   ―  118  ―  ―  118
Other securities   ―  24  ―  ―  24
Total debt securities  144  170  ―  ―  314
Total nuclear decommissioning trusts(1)  627  170  ―  ―  797
Commodity contracts subject to rate recovery  18  ―  3  ―  21
Commodity contracts not subject to rate recovery  1  ―  ―  ―  1
Total$ 646$ 170$ 3$ ―$ 819
           
Liabilities:          
Interest rate instruments$ ―$ 61$ ―$ ―$ 61
Commodity contracts subject to rate recovery  42  3  ―  (42)  3
Total$ 42$ 64$ ―$ (42)$ 64
           
 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 June 30, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 3$ 1$ ―$ ―$ 4
Commodity contracts not subject to rate recovery  2  ―  ―  ―  2
Total$ 5$ 1$ ―$ ―$ 6
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 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
Recurring Fair Value Measures Level 3 Rollforward Table
 Three months ended June 30,
(Dollars in millions)20112010
Balance as of April 1$ 3$ 9
Realized and unrealized gains (losses)  6  (2)
Allocated transmission instruments  1  ―
Settlements  (7)  ―
Balance as of June 30$ 3$ 7
Change in unrealized gains relating to     
instruments still held at June 30$ ―$ ―

 Six months ended June 30,
(Dollars in millions)20112010
Balance as of January 1$ 2$ 10
Realized and unrealized gains (losses)  12  (4)
Allocated transmission instruments  2  ―
Settlements  (13)  1
Balance as of June 30$ 3$ 7
Change in unrealized gains relating to     
instruments still held at June 30$ ―$ ―