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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA (Tables)
 12 Months Ended
Dec. 31, 2011
Schedule Of Regulatory Balancing Accounts [Abstract]  
Schedule Of Regulatory Balancing Accounts
              
SUMMARY OF REGULATORY BALANCING ACCOUNTS AT DECEMBER 31
(Dollars in millions)
  Sempra Energy  
  ConsolidatedSDG&ESoCalGas
  201120102011201020112010
Overcollected$ 709$ 733$ 419$ 443$ 290$ 290
Undercollected  (642)  (492)  (457)  (382)  (185)  (110)
Net payable (receivable)(1)$ 67$ 241$ (38)$ 61$ 105$ 180
(1) At December 31, 2011, the net receivable at SDG&E and the net payable at SoCalGas are shown separately
 on Sempra Energy’s Consolidated Balance Sheet.
              
Schedule Of Regulatory Assets (Liabilities) [Abstract]  
Schedule Of Regulatory Assets (Liabilities)
REGULATORY ASSETS (LIABILITIES) AT DECEMBER 31
(Dollars in millions)
  20112010
SDG&E    
Fixed-price contracts and other derivatives$ 258$ 299
Costs related to wildfire litigation  594  364
Deferred taxes recoverable in rates  570  502
Pension and other postretirement benefit obligations  309  279
Removal obligations(1)  (1,462)  (1,409)
Unamortized loss on reacquired debt, net  20  23
Environmental costs  17  17
Legacy meters  91  ―
Other  43  38
Total SDG&E  440  113
SoCalGas    
Pension and other postretirement benefit obligations  808  586
Employee benefit costs  66  59
Removal obligations(1)  (1,075)  (1,208)
Deferred taxes refundable in rates  (87)  (138)
Unamortized loss on reacquired debt, net  20  23
Environmental costs  21  18
Workers’ compensation   44  41
Other  (5)  (6)
Total SoCalGas  (208)  (625)
Other Sempra Energy    
Mobile Gas  (5)  (16)
Ecogas  3  9
Total Other Sempra Energy  (2)  (7)
Total Sempra Energy Consolidated$ 230$ (519)
(1)Related to obligations discussed below in “Asset Retirement Obligations.”

NET REGULATORY ASSETS (LIABILITIES) AS PRESENTED ON THE CONSOLIDATED BALANCE SHEETS AT DECEMBER 31
(Dollars in millions)
  2011 2010
  Sempra   Sempra  
  Energy   Energy  
  ConsolidatedSDG&ESoCalGas ConsolidatedSDG&ESoCalGas
Current regulatory assets$ 89$ 78$ 9 $ 90$ 71$ 12
Noncurrent regulatory assets  2,780  1,824  945   2,167  1,451  709
Current regulatory liabilities(1)  (1)  ―  ―   (8)  ―  ―
Noncurrent regulatory liabilities  (2,638)  (1,462)  (1,162)   (2,768)  (1,409)  (1,346)
Total$ 230$ 440$ (208) $ (519)$ 113$ (625)
(1)Included in Other Current Liabilities.
Schedule Of Receivables Collection Allowances [Abstract]  
Schedule Of Receivables Collection Allowances
COLLECTION ALLOWANCES
(Dollars in millions)
 Years ended December 31,
 201120102009
Sempra Energy Consolidated      
Allowances for collection of receivables at January 1$ 29$ 27$ 29
Provisions for uncollectible accounts  20  22  25
Write-offs of uncollectible accounts  (20)  (20)  (27)
Allowances for collection of receivables at December 31$ 29$ 29$ 27
SDG&E      
Allowances for collection of receivables at January 1$ 5$ 4$ 6
Provisions for uncollectible accounts  8  7  8
Write-offs of uncollectible accounts  (7)  (6)  (10)
Allowances for collection of receivables at December 31$ 6$ 5$ 4
SoCalGas      
Allowances for collection of receivables at January 1$ 14$ 16$ 18
Provisions for uncollectible accounts  8  8  12
Write-offs of uncollectible accounts  (10)  (10)  (14)
Allowances for collection of receivables at December 31$ 12$ 14$ 16
Schedule Of Inventory Balances [Abstract]  
Schedule Of Inventory Balances
INVENTORY BALANCES AT DECEMBER 31
(Dollars in millions)
     
  Natural GasMaterials and suppliesTotal
  201120102011201020112010
SDG&E$ 6$ 5$ 76$ 66$ 82$ 71
SoCalGas  128  86  23  19  151  105
Sempra South American Utilities  ―  ―  36  ―  36  ―
Sempra Mexico  10  23  7  8  17  31
Sempra Natural Gas  51  38  9  13  60  51
Sempra Energy Consolidated$ 195$ 152$ 151$ 106$ 346$ 258
  
Schedule Of Property Plant And Equipment By Major Functional Category [Abstract]  
Schedule Of Property Plant And Equipment By Major Functional Category
PROPERTY, PLANT AND EQUIPMENT BY MAJOR FUNCTIONAL CATEGORY
(Dollars in millions)
  Property, Plant Depreciation rates for
  and Equipment at years ended
  December 31, December 31,
  20112010 201120102009
SDG&E:           
Natural gas operations$ 1,349$ 1,280  3.15% 3.00% 2.84%
Electric distribution  4,894  4,700  4.13  4.06  3.97 
Electric transmission  1,938  1,795  2.74  2.70  2.67 
Electric generation(1)  2,166  1,737  4.92  4.30  3.84 
Other electric(2)  604  666  8.26  8.19  8.50 
Construction work in progress  2,052  1,069 NA NA NA 
Total SDG&E  13,003  11,247       
SoCalGas:           
Natural gas operations(3)  10,055  9,376  3.62  3.54  3.50 
Other non-utility  129  126  1.62  1.74  1.41 
Construction work in progress  381  322 NA NA NA 
Total SoCalGas  10,565  9,824       
            
Other operating units and parent(4):     Estimated Useful Lives
Land and land rights  292  194 25 to 50 years(5)
Machinery and equipment:           
Utility electric distribution operations  1,267  ― 10 to 50 years
Generating plants  1,278  1,604 4 to 35 years
LNG terminals  2,059  2,049 3 to 50 years
Pipelines and storage  1,510  1,375 10 to 50 years
Other  168  97 2 to 50 years
Construction work in progress  849  428   N/A   
Other  201  205 3 to 50 years
   7,624  5,952       
Total Sempra Energy Consolidated$ 31,192$ 27,023       
(1)Includes capital lease assets of $183 million and $182 million at December 31, 2011 and 2010, respectively.
(2)Includes capital lease assets of $26 million at both December 31, 2011 and 2010.
(3)Includes capital lease assets of $33 million at both December 31, 2011 and 2010.
(4)December 31, 2011 balances include $163 million and $126 million of utility plant, primarily pipelines and other distribution assets, at Mobile Gas and Ecogas, respectively. December 31, 2010 balances include $156 million and $137 million of utility plant, primarily pipelines and other distribution assets, at Mobile Gas and Ecogas, respectively.
(5)Estimated useful lives are for land rights.
Schedule Of Accumulated Depreciation And Decommissioning Amounts [Abstract]  
Schedule Of Accumulated Depreciation And Decommissioning Amounts
ACCUMULATED DEPRECIATION AND DECOMMISSIONING AMOUNTS
(Dollars in millions)
  December 31,
  20112010
SDG&E:    
Accumulated depreciation and decommissioning of utility plant in service:    
Electric(1)$ 2,387$ 2,152
Natural gas  576  542
Total SDG&E  2,963  2,694
SoCalGas:    
Accumulated depreciation of natural gas utility plant in service(2)  3,863  3,702
Accumulated depreciation – other non-utility  102  100
Total SoCalGas  3,965  3,802
Other operating units and parent:    
Accumulated depreciation – other non-utility(3)  755  713
Accumulated depreciation of utility electric distribution operations  44  ―
    799  713
Total Sempra Energy Consolidated$ 7,727$ 7,209
(1)Includes accumulated depreciation for assets under capital lease of $16 million and $7 million at December 31, 2011 and 2010, respectively.
(2)Includes accumulated depreciation for assets under capital lease of $22 million and $14 million at December 31, 2011 and 2010, respectively.
(3)December 31, 2011 balances include $15 million and $28 million of accumulated depreciation for utility plant at Mobile Gas and Ecogas, respectively. December 31, 2010 balances include $9 million and $29 million of accumulated depreciation for utility plant at Mobile Gas and Ecogas, respectively.
Schedule Of Capitalized Financing Costs [Abstract]  
Schedule Of Capitalized Financing Costs
CAPITALIZED FINANCING COSTS
(Dollars in millions)
 Years ended December 31,
 201120102009
Sempra Energy Consolidated:      
AFUDC related to debt$ 40$ 24$ 15
AFUDC related to equity  99  57  39
Other capitalized financing costs  26  33  73
Total Sempra Energy Consolidated$ 165$ 114$ 127
SDG&E:      
AFUDC related to debt$ 33$ 18$ 10
AFUDC related to equity  80  43  29
Other capitalized financing costs  ―  ―  4
Total SDG&E$ 113$ 61$ 43
SoCalGas:      
AFUDC related to debt$ 7$ 6$ 5
AFUDC related to equity  19  14  10
Other capitalized financing costs  ―  ―  1
Total SoCalGas$ 26$ 20$ 16
Schedule Of Goodwill [Abstract]  
Schedule Of Goodwill
GOODWILL        
(Dollars in millions)        
   Sempra      
  South AmericanSempra Sempra  
   Utilities Mexico Natural Gas Total
Balance as of December 31, 2009$ ―$ 6$ 62$ 68
Acquisition of Mexican pipeline and natural gas infrastructure assets and other  ―  19  ―  19
Balance as of December 31, 2010  ―  25  62  87
Acquisition of Chilquinta Energía and Luz del Sur  975  ―  ―  975
Foreign currency translation(1)  (26)  ―  ―  (26)
Balance at December 31, 2011$ 949$ 25$ 62$ 1,036
(1)We record the offset of this fluctuation to other comprehensive income.        
          
Schedule Of Acquired Finite Lived Intangible Assets By Major Class [Abstract]  
Schedule Of Other Intangible Assets
OTHER INTANGIBLE ASSETS     
(Dollars in millions)     
 Amortization period December 31,December 31,
 (years)20112010
Storage rights46$ 138$ 138
Development rights50  322  322
Other11 years to indefinite  21  16
    481  476
Less accumulated amortization:     
Storage rights   (21)  (14)
Development rights   (10)  (7)
Other   (2)  (2)
    (33)  (23)
Total  $ 448$ 453
Schedule Of Variable Interest Entities [Abstract]  
Schedule Of Variable Interest Entities
AMOUNTS ASSOCIATED WITH OTAY MESA VIE
(Dollars in millions)
   December 31,
   20112010
Cash and cash equivalents$ 12$ 10
Restricted cash      7  6
Accounts receivable - trade      7  ―
Accounts receivable - other      ―  (1)
Inventories  2  2
Other  1  1
Total current assets  29  18
Restricted cash      22  ―
Sundry  6  6
Property, plant and equipment, net  494  516
Total assets$ 551$ 540
     
Current portion of long-term debt$ 10$ 10
Fixed-price contracts and other derivatives  16  17
Other   9  1
Total current liabilities  35  28
Long-term debt  345  355
Fixed-price contracts and other derivatives  65  41
Deferred credits and other  4  3
Other noncontrolling interest  102  113
Total liabilities and equity$ 551$ 540
          
    Years ended December 31,
   201120102009
       
Operating revenues       
Electric  $ ―$ (1)$ (1)
Natural gas     ―  (3)  ―
Total operating revenues    ―  (4)  (1)
Operating expenses      
Cost of electric fuel and purchased power  (72)  (82)  (13)
Operation and maintenance 19  20  7
Depreciation and amortization    22  26  7
Total operating expenses    (31)  (36)  1
Operating income (loss)    31  32  (2)
Other (expense) income, net    (1)  (34)  27
Interest expense    (11)  (14)  (1)
Income (loss) before income taxes/Net income (loss)  19  (16)  24
(Earnings) losses attributable to noncontrolling interest  (19)  16  (24)
Earnings$ ―$ ―$ ―
Schedule Of Changes In Asset Retirement Obligations [Abstract]  
Schedule Of Changes In Asset Retirement Obligations
CHANGES IN ASSET RETIREMENT OBLIGATIONS
(Dollars in millions)
  Sempra Energy      
  Consolidated SDG&E SoCalGas
  20112010 20112010 20112010
Balance as of January 1(1)$ 1,468$ 1,313 $ 623$ 590 $ 803$ 676
Accretion expense  82  77   38  37   41  38
Liabilities incurred  12  10   3  ―   ―  ―
Payments  (1)  (17)   ―  ―   ―  (2)
Revisions(2,3)  364  85   34  (4)   331  91
Balance as of December 31(1)$ 1,925$ 1,468 $ 698$ 623 $ 1,175$ 803
(1)The current portions of the obligations are included in Other Current Liabilities on the Consolidated Balance Sheets.
(2)The increase in obligations at SDG&E and SoCalGas for revisions in 2011 resulted from changes in assets in service and a decrease in the discount rate from 5.13 percent in 2010 to 4.00 percent in 2011, based on the risk-free rate plus an estimated credit spread.
(3)The increase in obligations at SoCalGas for revisions in 2010 resulted from changes in assets in service and a decrease in the discount rate from 5.54 percent in 2009 to 5.13 percent in 2010, based on the risk-free rate plus an estimated credit spread.
Schedule Of Accumulated Other Comprehensive Income [Abstract]  
Schedule Of Accumulated Other Comprehensive Income
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) AND
ASSOCIATED INCOME TAX EXPENSE (BENEFIT)
(Dollars in millions)
 Accumulated Other Comprehensive Income (Loss)Income Tax Expense (Benefit)
 2011201020112010
Sempra Energy Consolidated        
Foreign currency translation loss$ (359)$ (229)$ (3)$ ―
Financial instruments  (31)  (15)  (22)  (12)
Unrealized gains on available-for-sale securities  ―  1  ―  1
Unamortized net actuarial loss  (100)  (88)  (68)  (60)
Unamortized prior service credit  1  1  1  1
Balance as of December 31$ (489)$ (330)$ (92)$ (70)
SDG&E        
Unamortized net actuarial loss$ (11)$ (11)$ (8)$ (8)
Unamortized prior service credit  1  1  1  1
Balance as of December 31$ (10)$ (10)$ (7)$ (7)
SoCalGas        
Unamortized net actuarial loss$ (6)$ (5)$ (4)$ (4)
Unamortized prior service credit  1  1  ―  1
Financial instruments  (16)  (18)  (11)  (12)
Balance as of December 31$ (21)$ (22)$ (15)$ (15)
Schedule Of Noncontrolling Interests [Abstract]  
Schedule Of Noncontrolling Interests
OWNERSHIP INTERESTS HELD BY OTHERS AS OF DECEMBER 31  
(Dollars in millions)  
  Percent Ownership Held by Others  2011 2010
Bay Gas(1)9%$ 17$ 15
Southern Gas Transmission(1)49   1  1
Liberty(1)25   9  (18)
Tecsur(2)10   4  -
Luz del Sur(2)20   216  -
Chilquinta Energía(2)15 - 43   34  -
Otay Mesa VIE (at SDG&E)100   102  113
Total Sempra Energy  $ 383$ 111
(1)Part of Sempra Natural Gas.
(2)Controlling interest acquired in 2011.
Schedule Of Utilities Revenues [Abstract]  
Schedule Of Utilities Revenues
TOTAL UTILITIES REVENUES AT SEMPRA ENERGY CONSOLIDATED(1)
(Dollars in millions)
  Years ended December 31,
  201120102009
Natural gas revenues$ 4,489$ 4,491$ 4,002
Electric revenues  3,833  2,528  2,419
Total$ 8,322$ 7,019$ 6,421
(1) Excludes intercompany revenues.      
Schedule Of Foreign Currency Translation Adjustments To Equity Method Investments [Abstract]  
Schedule Of Foreign Currency Translation Adjustments To Equity Method Investments [Text Block]
   Upward (downward) adjustment to investments
InvestmentCurrency2011(1)20102009
Chilquinta EnergíaChilean Peso$ (10)$ 34$ 85
Luz del SurPeruvian Nuevo Sol  ―  5  13
(1)As discussed in Note 3, the cumulative foreign currency translation adjustment balances totaling $54 million in Accumulated Other Comprehensive Income (Loss) as of April 6, 2011 were reclassified to net income as a result of the gain on the remeasurement of our equity method investments in Chilquinta Energía and Luz del Sur during the second quarter of 2011.
Schedule Of Foreign Currency Transaction Gain (Loss) [Abstract]  
Schedule Of Foreign Currency Transaction Gain (Loss) [Text Block]
 Years ended December 31,
(Dollars in millions)201120102009
Currency transaction gain$ 11$ 4$ 3
Schedule Of Due To And From Affiliates [Abstract]  
Schedule Of Amounts Due To and From Affiliates at SDG&E, PE and SoCalGas
AMOUNTS DUE TO AND FROM AFFILIATES AT SDG&E AND SOCALGAS
(Dollars in millions)
  December 31,
 20112010
SDG&E    
Current:    
Due from SoCalGas$ 2$ 11
Due from various affiliates  65  1
 $ 67$ 12
     
Due to Sempra Energy$ 14$ 16
     
Income taxes due from Sempra Energy(1)$ 97$ 25
     
SoCalGas    
Current:    
Due from Sempra Energy$ 23$ 60
Due from various affiliates  17  ―
Due from RBS Sempra Commodities  ―  3
  $ 40$ 63
      
Due to SDG&E$ 2$ 11
     
Income taxes due from (to) Sempra Energy(1)$ 17$ (3)
(1)SDG&E and SoCalGas are included in the consolidated income tax return of Sempra Energy and are allocated income tax expense from Sempra Energy in an amount equal to that which would result from the companies’ having always filed a separate return.
Schedule Of Revenues From Affiliates [Abstract]  
Schedule Of Revenues From Unconsolidated Affiliates at the Utility Businesses
REVENUES FROM UNCONSOLIDATED AFFILIATES AT UTILITY BUSINESSES
(Dollars in millions)
 Years ended December 31,
 201120102009
SDG&E$ 7$ 8$ 8
SoCalGas  53  44  43
Schedule Of Transactions With Joint Venture [Abstract]  
Schedule Of Amounts Recorded For Transactions with RBS Sempra Commodities
AMOUNTS RECORDED FOR TRANSACTIONS WITH RBS SEMPRA COMMODITIES
(Dollars in millions)  
  Years ended December 31,
  2011(1)2010 2009
Revenues:      
SoCalGas$ ―$ 14$ 13
Sempra Mexico  37  82  39
Sempra Natural Gas  7  184  35
        
Cost of natural gas:      
SDG&E$ ―$ 3$ 4
SoCalGas  ―  36  19
Sempra Mexico  74  193  67
Sempra Natural Gas  3  177  20
(1)With the exception of Sempra Mexico, whose contract with RBS Sempra Commodities expired in July 2011, amounts only include activities prior to May 1, 2011, the date by which substantially all the contracts with RBS Sempra Commodities were assigned to buyers of the joint venture businesses.
        
    December 31,  
    2010  
Fixed-price contracts and other derivatives - Net Asset (Liability):     
Sempra Mexico  $ (6)  
Sempra Natural Gas    (12)  
Total  $ (18)  
       
Due to unconsolidated affiliates:      
Sempra Mexico  $ 11  
Sempra Natural Gas    13  
Sempra Commodities    11  
Total  $ 35  
       
Due from unconsolidated affiliates:      
SoCalGas  $ 3  
Sempra Mexico    12  
Sempra Natural Gas    14  
Parent and other    5  
Total  $ 34  
Schedule Of Other Income (Expense) [Abstract]  
Schedule Of Other Income (Expense)
OTHER INCOME, NET
(Dollars in millions)
  Years ended December 31,
  201120102009
Sempra Energy Consolidated:      
Allowance for equity funds used during construction$ 99$ 57$ 39
Investment gains(1)  22  35  55
(Losses) gains on interest rate and foreign exchange instruments(2)  (14)  (24)  33
Regulatory interest income, net(3)  2  1  4
Sundry, net(4)  21  71  18
 Total$ 130$ 140$ 149
SDG&E:      
Allowance for equity funds used during construction$ 80$ 43$ 29
Regulatory interest income, net(3)  2  ―  5
(Losses) gains on interest rate instruments(5)  (1)  (34)  27
Sundry, net  (2)  1  3
 Total$ 79$ 10$ 64
SoCalGas:      
Allowance for equity funds used during construction$ 19$ 14$ 10
Regulatory interest income (expense), net(3)  ―  1  (1)
Sundry, net  (6)  (3)  (2)
 Total $ 13$ 12$ 7
(1)Represents investment gains on dedicated assets in support of our executive retirement and deferred compensation plans. These amounts are partially offset by corresponding changes in compensation expense related to the plans.
(2)Sempra Energy Consolidated includes Otay Mesa VIE and additional instruments.  
(3)Interest on regulatory balancing accounts.
(4)Amount in 2010 includes proceeds of $48 million from a legal settlement.
(5)Related to Otay Mesa VIE.