v3.8.0.1
- REGULATORY ACCOUNTS (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Sempra Mexico [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) $ 83 $ 83
Net Regulatory Assets (Liabilities) Sempra Energy Consolidated [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (2,294) (2,189)
San Diego Gas and Electric Company [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Regulatory balancing accounts - net undercollected, Noncurrent 72 63
San Diego Gas and Electric Company [Member] | Fixed-price contracts and other derivatives [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 103 96
San Diego Gas and Electric Company [Member] | Deferred income taxes (refundable) recoverable in rates [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (305) (281)
San Diego Gas and Electric Company [Member] | Pension and other postretirement benefit plan obligations [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 170 153
San Diego Gas and Electric Company [Member] | Removal obligations [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (1,827) (1,846)
San Diego Gas and Electric Company [Member] | Unamortized loss on reacquired debt [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 8 9
San Diego Gas and Electric Company [Member] | Environmental costs [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 29 29
San Diego Gas and Electric Company [Member] | Sunrise Powerlink fire mitigation [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 120 119
San Diego Gas and Electric Company [Member] | Regulatory Balancing Accounts, Commodity – electric [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 112 82
San Diego Gas and Electric Company [Member] | Regulatory Balancing Accounts, Gas transportation [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 19 22
San Diego Gas and Electric Company [Member] | Regulatory Balancing Accounts, Safety and reliability [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 52 48
San Diego Gas and Electric Company [Member] | Regulatory Balancing Accounts, Public purpose programs [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (83) (70)
San Diego Gas and Electric Company [Member] | Regulatory Balancing Accounts, Other balancing accounts [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 149 233
San Diego Gas and Electric Company [Member] | Other regulatory (liabilities) assets [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (89) (70)
San Diego Gas and Electric Company [Member] | Net Regulatory Assets (Liabilities) SDGE [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (1,542) (1,476)
Southern California Gas Company [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Regulatory balancing accounts - net undercollected, Noncurrent 141 118
Southern California Gas Company [Member] | Deferred income taxes (refundable) recoverable in rates [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (395) (437)
Southern California Gas Company [Member] | Pension and other postretirement benefit plan obligations [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 529 513
Southern California Gas Company [Member] | Employee benefit costs [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 45 45
Southern California Gas Company [Member] | Removal obligations [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (910) (924)
Southern California Gas Company [Member] | Unamortized loss on reacquired debt [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 7 8
Southern California Gas Company [Member] | Environmental costs [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 21 22
Southern California Gas Company [Member] | Workers’ compensation [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 12 12
Southern California Gas Company [Member] | Regulatory Balancing Accounts, Commodity - gas including transportation    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 168 151
Southern California Gas Company [Member] | Regulatory Balancing Accounts, Safety and reliability [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) 275 266
Southern California Gas Company [Member] | Regulatory Balancing Accounts, Public purpose programs [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (353) (274)
Southern California Gas Company [Member] | Regulatory Balancing Accounts, Other balancing accounts [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (149) (114)
Southern California Gas Company [Member] | Other regulatory (liabilities) assets [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) (85) (64)
Southern California Gas Company [Member] | Net Regulatory Assets (Liabilities) SoCalGas [Member]    
Schedule Of Net Regulatory Assets (Liabilities) [Line Items]    
Net regulatory assets (liabilities) $ (835) $ (796)