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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Jun. 30, 2013
Fair Value Measurements (Tables) [Abstract]  
Fair Value of Financial Instruments Table
FAIR VALUE OF FINANCIAL INSTRUMENTS
(Dollars in millions)
  June 30, 2013
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Total long-term debt(1)$ 11,901 $ ―$ 11,646$ 1,076$ 12,722
Preferred stock of subsidiaries  99   ―  106  ―  106
SDG&E:           
Total long-term debt(2)$ 4,130 $ ―$ 4,089$ 340$ 4,429
Contingently redeemable preferred stock  79   ―  83  ―  83
SoCalGas:           
Total long-term debt(3)$ 1,413 $ ―$ 1,515$ ―$ 1,515
Preferred stock  22   ―  25  ―  25
             
  December 31, 2012
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Investments in affordable housing partnerships(4)$ 12 $ ―$ ―$ 36$ 36
Total long-term debt(1)  11,873   ―  12,287  956  13,243
Preferred stock of subsidiaries  99   ―  107  ―  107
SDG&E:           
Total long-term debt(2)$ 4,135 $ ―$ 4,243$ 345$ 4,588
Contingently redeemable preferred stock  79   ―  85  ―  85
SoCalGas:           
Total long-term debt(3)$ 1,413 $ ―$ 1,599$ ―$ 1,599
Preferred stock  22   ―  24  ―  24
(1)Before reductions for unamortized discount (net of premium) of $16 million at both June 30, 2013 and December 31, 2012, and excluding capital leases of $185 million at June 30, 2013 and $189 million at December 31, 2012, and commercial paper classified as long-term debt of $300 million at December 31, 2012. We discuss our long-term debt in Note 6 above and in Note 5 of the Notes to Consolidated Financial Statements in the Annual Report.
(2)Before reductions for unamortized discount of $11 million at June 30, 2013 and $12 million at December 31, 2012, and excluding capital leases of $182 million at June 30, 2013 and $185 million at December 31, 2012.
(3)Before reductions for unamortized discount of $4 million at both June 30, 2013 and December 31, 2012, and excluding capital leases of $2 million at June 30, 2013 and $4 million at December 31, 2012.
(4)Investments in affordable housing partnerships at Parent and Other.
Nuclear Decommissioning Trusts Table
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
     Gross Gross Estimated
     Unrealized Unrealized Fair
   Cost Gains Losses Value
As of June 30, 2013:        
Debt securities:        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies(1)$ 163$ 4$ (3)$ 164
Municipal bonds(2)  72  3  (1)  74
Other securities(3)  139  2  (5)  136
Total debt securities  374  9  (9)  374
Equity securities  230  333  (4)  559
Cash and cash equivalents  5  ―  ―  5
Total $ 609$ 342$ (13)$ 938
As of December 31, 2012:        
Debt securities:        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies$ 147$ 9$ ―$ 156
Municipal bonds  57  6  ―  63
Other securities  121  10  (1)  130
Total debt securities  325  25  (1)  349
Equity securities  249  292  (2)  539
Cash and cash equivalents  20  ―  ―  20
Total $ 594$ 317$ (3)$ 908
(1)Maturity dates are 2013-2056.
(2)Maturity dates are 2013-2062.
(3)Maturity dates are 2013-2111.
Sales of Securities Table
SALES OF SECURITIES
(Dollars in millions)
 Three months ended June 30,Six months ended June 30,
 2013201220132012
Proceeds from sales$ 192$ 191$ 326$ 320
Gross realized gains  6  5  11  9
Gross realized losses  (4)  (5)  (7)  (5)
Recurring Fair Value Measures Table
RECURRING FAIR VALUE MEASURES – SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
 At fair value as of June 30, 2013
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 559$ ―$ ―$ ―$ 559
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  94  70  ―  ―  164
Municipal bonds  ―  74  ―  ―  74
Other securities  ―  136  ―  ―  136
Total debt securities  94  280  ―  ―  374
Total nuclear decommissioning trusts(1)  653  280  ―  ―  933
Interest rate instruments  ―  73  ―  ―  73
Commodity contracts subject to rate recovery  12  ―  47  ―  59
Commodity contracts not subject to rate recovery  29  13  (10)  ―  32
Total$ 694$ 366$ 37$ ―$ 1,097
Liabilities:          
Interest rate and foreign exchange instruments$ ―$ 124$ ―$ ―$ 124
Commodity contracts subject to rate recovery  17  9  ―  (17)  9
Commodity contracts not subject to rate recovery  1  14  ―  (1)  14
Total$ 18$ 147$ ―$ (18)$ 147
           
 At fair value as of December 31, 2012
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 539$ ―$ ―$ ―$ 539
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  87  69  ―  ―  156
Municipal bonds  ―  63  ―  ―  63
Other securities  ―  130  ―  ―  130
Total debt securities  87  262  ―  ―  349
Total nuclear decommissioning trusts(1)  626  262  ―  ―  888
Interest rate instruments  ―  68  ―  ―  68
Commodity contracts subject to rate recovery  13  ―  61  ―  74
Commodity contracts not subject to rate recovery  28  15  ―  ―  43
Investments  1  ―  ―  ―  1
Total$ 668$ 345$ 61$ ―$ 1,074
Liabilities:          
Interest rate instruments$ ―$ 126$ ―$ ―$ 126
Commodity contracts subject to rate recovery  23  9  ―  (23)  9
Commodity contracts not subject to rate recovery  6  23  ―  (11)  18
Total$ 29$ 158$ ―$ (34)$ 153
(1)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES – SDG&E
(Dollars in millions)
 At fair value as of June 30, 2013
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 559$ ―$ ―$ ―$ 559
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  94  70  ―  ―  164
Municipal bonds   ―  74  ―  ―  74
Other securities   ―  136  ―  ―  136
Total debt securities  94  280  ―  ―  374
Total nuclear decommissioning trusts(1)  653  280  ―  ―  933
Commodity contracts subject to rate recovery  10  ―  47  ―  57
Commodity contracts not subject to rate recovery  2  ―  ―  ―  2
Total$ 665$ 280$ 47$ ―$ 992
           
Liabilities:          
Interest rate instruments$ ―$ 60$ ―$ ―$ 60
Commodity contracts subject to rate recovery  17  8  ―  (17)  8
Total$ 17$ 68$ ―$ (17)$ 68
           
 At fair value as of December 31, 2012
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 539$ ―$ ―$ ―$ 539
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  87  69  ―  ―  156
Municipal bonds   ―  63  ―  ―  63
Other securities   ―  130  ―  ―  130
Total debt securities  87  262  ―  ―  349
Total nuclear decommissioning trusts(1)  626  262  ―  ―  888
Commodity contracts subject to rate recovery  12  ―  61  ―  73
Commodity contracts not subject to rate recovery  1  ―  ―  ―  1
Total$ 639$ 262$ 61$ ―$ 962
           
Liabilities:          
Interest rate instruments$ ―$ 81$ ―$ ―$ 81
Commodity contracts subject to rate recovery  23  8  ―  (23)  8
Total$ 23$ 89$ ―$ (23)$ 89
(1)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES – SOCALGAS
(Dollars in millions)
 At fair value as of June 30, 2013
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 2$ ―$ ―$ ―$ 2
Commodity contracts not subject to rate recovery  3  ―  ―  ―  3
Total$ 5$ ―$ ―$ ―$ 5
           
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
           
 At fair value as of December 31, 2012
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 1$ ―$ ―$ ―$ 1
Commodity contracts not subject to rate recovery  3  ―  ―  ―  3
Total$ 4$ ―$ ―$ ―$ 4
           
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
Recurring Fair Value Measures Level 3 Rollforward Table
LEVEL 3 RECONCILIATIONS
(Dollars in millions)
 Three months ended June 30,
 20132012
Balance as of April 1$ 58$ 21
Realized and unrealized (losses) gains  (2)  5
Settlements  (9)  (13)
Balance as of June 30$ 47$ 13
Change in unrealized gains or losses relating to     
instruments still held at June 30$ (1)$ ―

LEVEL 3 RECONCILIATIONS
(Dollars in millions)
 Six months ended June 30,
 20132012
Balance as of January 1$ 61$ 23
Realized and unrealized (losses) gains  (3)  7
Allocated transmission instruments  ―  1
Settlements  (11)  (18)
Balance as of June 30$ 47$ 13
Change in unrealized gains or losses relating to     
instruments still held at June 30$ (1)$ ―