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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2014
Fair Value Measurements (Tables) [Abstract]  
Fair Value of Financial Instruments Table
FAIR VALUE OF FINANCIAL INSTRUMENTS
(Dollars in millions)
  March 31, 2014
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Total long-term debt(1)$ 11,252 $ ―$ 11,444$ 776$ 12,220
Preferred stock of subsidiary  20   ―  21  ―  21
SDG&E:           
Total long-term debt(2)$ 4,383 $ ―$ 4,380$ 332$ 4,712
SoCalGas:           
Total long-term debt(3)$ 1,413 $ ―$ 1,523$ ―$ 1,523
Preferred stock  22   ―  23  ―  23
             
  December 31, 2013
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Total long-term debt(1)$ 12,022 $ ―$ 11,925$ 751$ 12,676
Preferred stock of subsidiary  20   ―  20  ―  20
SDG&E:           
Total long-term debt(2)$ 4,386 $ ―$ 4,226$ 335$ 4,561
SoCalGas:           
Total long-term debt(3)$ 1,413 $ ―$ 1,469$ ―$ 1,469
Preferred stock  22   ―  22  ―  22
(1)Before reductions for unamortized discount (net of premium) of $18 million and $17 million at March 31, 2014 and December 31, 2013, respectively, and excluding build-to-suit and capital leases of $263 million and $195 million at March 31, 2014 and December 31, 2013, respectively, and commercial paper classified as long-term debt of $300 million and $200 million at March 31, 2014 and December 31, 2013, respectively. 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 both March 31, 2014 and December 31, 2013, and excluding capital leases of $238 million and $179 million at March 31, 2014 and December 31, 2013, respectively.
(3)Before reductions for unamortized discount of $5 million and $4 million at March 31, 2014 and December 31, 2013, respectively, and excluding capital leases of $1 million and $2 million at March 31, 2014 and December 31, 2013, respectively.
Recurring Fair Value Measures Table
RECURRING FAIR VALUE MEASURES – SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
 At fair value as of March 31, 2014
  Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 623$ ―$ ―$ ―$ 623
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  55  56  ―  ―  111
Municipal bonds  ―  112  ―  ―  112
Other securities  ―  178  ―  ―  178
Total debt securities  55  346  ―  ―  401
Total nuclear decommissioning trusts(2)  678  346  ―  ―  1,024
Interest rate instruments  ―  64  ―  ―  64
Commodity contracts subject to rate recovery  7  4  95  31  137
Commodity contracts not subject to rate recovery  1  4  ―  15  20
Total$ 686$ 418$ 95$ 46$ 1,245
Liabilities:          
Interest rate and foreign exchange instruments$ ―$ 127$ ―$ ―$ 127
Commodity contracts subject to rate recovery  ―  15  ―  ―  15
Commodity contracts not subject to rate recovery  1  8  ―  (2)  7
Total$ 1$ 150$ ―$ (2)$ 149
           
 At fair value as of December 31, 2013
  Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 614$ ―$ ―$ ―$ 614
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  59  58  ―  ―  117
Municipal bonds  ―  111  ―  ―  111
Other securities  ―  153  ―  ―  153
Total debt securities  59  322  ―  ―  381
Total nuclear decommissioning trusts(2)  673  322  ―  ―  995
Interest rate instruments  ―  56  ―  ―  56
Commodity contracts subject to rate recovery  2  1  99  31  133
Commodity contracts not subject to rate recovery  1  5  ―  17  23
Total$ 676$ 384$ 99$ 48$ 1,207
Liabilities:          
Interest rate and foreign exchange instruments$ ―$ 117$ ―$ ―$ 117
Commodity contracts subject to rate recovery  ―  13  ―  ―  13
Commodity contracts not subject to rate recovery  4  8  ―  (5)  7
Total$ 4$ 138$ ―$ (5)$ 137
(1)Includes the effect of the contractual ability to settle contracts under master netting agreements and with cash collateral, as well as cash collateral not offset.
(2)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES – SDG&E
(Dollars in millions)
 At fair value as of March 31, 2014
  Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 623$ ―$ ―$ ―$ 623
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  55  56  ―  ―  111
Municipal bonds   ―  112  ―  ―  112
Other securities   ―  178  ―  ―  178
Total debt securities  55  346  ―  ―  401
Total nuclear decommissioning trusts(2)  678  346  ―  ―  1,024
Commodity contracts subject to rate recovery  7  3  95  29  134
Commodity contracts not subject to rate recovery  ―  ―  ―  1  1
Total$ 685$ 349$ 95$ 30$ 1,159
Liabilities:          
Interest rate instruments$ ―$ 53$ ―$ ―$ 53
Commodity contracts subject to rate recovery  ―  14  ―  ―  14
Total$ ―$ 67$ ―$ ―$ 67
           
 At fair value as of December 31, 2013
  Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Nuclear decommissioning trusts:          
Equity securities$ 614$ ―$ ―$ ―$ 614
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  59  58  ―  ―  117
Municipal bonds   ―  111  ―  ―  111
Other securities   ―  153  ―  ―  153
Total debt securities  59  322  ―  ―  381
Total nuclear decommissioning trusts(2)  673  322  ―  ―  995
Commodity contracts subject to rate recovery  1  1  99  29  130
Commodity contracts not subject to rate recovery  ―  ―  ―  1  1
Total$ 674$ 323$ 99$ 30$ 1,126
Liabilities:          
Interest rate instruments$ ―$ 55$ ―$ ―$ 55
Commodity contracts subject to rate recovery  ―  12  ―  ―  12
Total$ ―$ 67$ ―$ ―$ 67
(1)Includes the effect of the contractual ability to settle contracts under master netting agreements and with cash collateral, as well as cash collateral not offset.
(2)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES – SOCALGAS
(Dollars in millions)
  At fair value as of March 31, 2014
   Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ 2$ 3
Commodity contracts not subject to rate recovery  ―  ―  ―  2  2
Total$ ―$ 1$ ―$ 4$ 5
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
            
  At fair value as of December 31, 2013
   Level 1 Level 2 Level 3 Netting(1) Total
Assets:          
Commodity contracts subject to rate recovery$ 1$ ―$ ―$ 2$ 3
Commodity contracts not subject to rate recovery  ―  ―  ―  2  2
Total$ 1$ ―$ ―$ 4$ 5
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
(1)Includes the effect of the contractual ability to settle contracts under master netting agreements and with cash collateral, as well as cash collateral not offset.
Recurring Fair Value Measures Level 3 Rollforward Table
LEVEL 3 RECONCILIATIONS
(Dollars in millions)
 Three months ended March 31,
 20142013
Balance at January 1$ 99$ 61
Realized and unrealized gains (losses)  1  (1)
Allocated transmission instruments  1  ―
Settlements  (6)  (2)
Balance at March 31$ 95$ 58
Change in unrealized gains or losses relating to     
instruments still held at March 31$ ―$ ―