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REGULATORY MATTERS - REGULATORY ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Amortization expense on regulatory assets | $ 5 | $ 50 | $ 65
Net Regulatory Assets (Liabilities) Sempra Energy Consolidated [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | (2,394) | (2,189) |
San Diego Gas and Electric Company [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Regulatory balancing accounts - net undercollected, Noncurrent | 78 | 63 |
Amortization expense on regulatory assets | 2 | 49 | 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) | (150) | 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) | (236) | (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) | 186 | 153 |
San Diego Gas and Electric Company [Member] | Removal obligations [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | (1,848) | (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) | $ 7 | 9 |
San Diego Gas and Electric Company [Member] | Unamortized loss on reacquired debt [Member] | Minimum [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Remaining amortization period | 1 year |  |
San Diego Gas and Electric Company [Member] | Unamortized loss on reacquired debt [Member] | Maximum [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Remaining amortization period | 9 years |  |
San Diego Gas and Electric Company [Member] | Environmental costs [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | $ 28 | 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 |
Remaining amortization period | 51 |  |
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) | $ (8) | 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) | 45 | 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) | 70 | 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) | (62) | (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) | 145 | 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) | (177) | (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) | (1,880) | (1,476) |
Southern California Gas Company [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Regulatory balancing accounts - net undercollected, Noncurrent | 185 | 118 |
Amortization expense on regulatory assets | 3 | 1 | $ 2
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) | (336) | (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) | 470 | 513 |
Southern California Gas Company [Member] | Employee benefit costs [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | 49 | 45 |
Southern California Gas Company [Member] | Removal obligations [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | (833) | (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] | Unamortized loss on reacquired debt [Member] | Minimum [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Remaining amortization period | 3 years |  |
Southern California Gas Company [Member] | Unamortized loss on reacquired debt [Member] | Maximum [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Remaining amortization period | 7 years |  |
Southern California Gas Company [Member] | Environmental costs [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | $ 28 | 22 |
Southern California Gas Company [Member] | Workers’ compensation [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | 9 | 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) | 196 | 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) | 332 | 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) | (325) | (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) | (68) | (114) |
Southern California Gas Company [Member] | Other regulatory (liabilities) assets [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | (130) | (64) |
Southern California Gas Company [Member] | Net Regulatory Assets (Liabilities) SoCalGas [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | (601) | (796) |
Sempra Mexico [Member] | Deferred income taxes (refundable) recoverable in rates [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | 81 | 83 |
Sempra Mexico [Member] | Other Regulatory Assets [Member] |  |  |
Schedule Of Net Regulatory Assets (Liabilities) [Line Items] |  |  |
Net regulatory assets (liabilities) | $ 6 | $ 0 |

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