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EMPLOYEE BENEFIT PLANS - FAIR VALUE OF PLAN ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3,002 $ 2,662 $ 2,160
Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 17  
Pension Plan [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 931 923  
Pension Plan [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 563 556  
Pension Plan [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 183 96  
Pension Plan [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 272 267  
Pension Plan [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 9  
Pension Plan [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 418 346  
Pension Plan [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61 62  
Pension Plan [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 2  
Pension Plan [Member] | Defined Benefit Plan, Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Pension Plan [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 493 $ 417  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
Pension Plan [Member] | Private Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10 $ 5  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
Pension Plan [Member] | Defined Benefit Plan, Accounts Receivable (Payable), Net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 13 $ (38)  
Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,486 2,278  
Pension Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,924 1,819  
Pension Plan [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 17  
Pension Plan [Member] | Level 1 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 931 923  
Pension Plan [Member] | Level 1 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 563 555  
Pension Plan [Member] | Level 1 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 183 96  
Pension Plan [Member] | Level 1 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 238 228  
Pension Plan [Member] | Level 1 [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 1 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 1 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 1 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 1 [Member] | Defined Benefit Plan, Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2    
Pension Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 562 459  
Pension Plan [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 2 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 2 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Pension Plan [Member] | Level 2 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plan [Member] | Level 2 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34 39  
Pension Plan [Member] | Level 2 [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 9  
Pension Plan [Member] | Level 2 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 418 346  
Pension Plan [Member] | Level 2 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61 62  
Pension Plan [Member] | Level 2 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37 2  
Pension Plan [Member] | Level 2 [Member] | Defined Benefit Plan, Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (1)    
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,399 1,281 1,108
Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Total investment assets in the fair value hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 624 602  
Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Total investment assets in the fair value hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 533 478  
San Diego Gas and Electric Company [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 819 739 600
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 213 197 172
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 21  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 13  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80 68  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 33  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 8  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 51 $ 47  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Accounts Receivable (Payable), Net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ (2) $ (2)  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 164 152  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 146 134  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 21  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 13  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80 68  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38 32  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18 18  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 8  
Southern California Gas Company [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,969 1,737 1,385
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,159 1,059 $ 916
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 3  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76 78  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46 48  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61 52  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 298 288  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 11  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 349 309  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42 40  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81 75  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Derivative [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 3  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 188 $ 157  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Venture Capital Funds and Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1    
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember    
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Accounts Receivable (Payable), Net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ (5)  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 970 907  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 459 452  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 3  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76 78  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46 48  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61 52  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 273 267  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Defined Benefit Plan, Derivative [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 3  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 511 455  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Registered Investment Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 25 21  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | International government bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14 10  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 349 309  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42 40  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81 75  
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Defined Benefit Plan, Derivative [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27 25  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10 9  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 4  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 3  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (1)    
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 4 $ 4  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Equity Securities, Registered Investment Companies      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1    
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 $ 21  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19 16  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10 9  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 3  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 1 [Member] | Equity Securities, Registered Investment Companies      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 5  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Domestic [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Domestic corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 3  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | International corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 $ 1  
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Registered investment companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (1)    
Other Sempra Energy [Member] | Other Postretirement Benefits Plan [Member] | Level 2 [Member] | Equity Securities, Registered Investment Companies      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0