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REGULATORY MATTERS - COST OF CAPITAL & FERC RATES (Details) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Jan. 01, 2019
San Diego Gas and Electric Company [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Transmission owner, formula rate revenue requirement increase |  | $ 88 |  |
Transmission owner, formula rate revenue requirement increase percentage |  | 10.60% |  |
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighted return on rate base |  | 7.79% |  |
Cost of debt |  | 5.00% |  |
San Diego Gas and Electric Company [Member] | Federal Energy Regulatory Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighting |  | 100.00% |  |
Weighted return on rate base |  | 7.51% |  |
San Diego Gas and Electric Company [Member] | Scenario, Forecast [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Transmission owner, formula rate revenue requirement | $ 911 |  |  |
Minimum common equity ratio |  |  |  | 11.20%
San Diego Gas and Electric Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighted return on rate base |  |  | 7.55% |
Authorized weighting |  |  | 100.00% |
Cost of debt |  |  | 4.59% |
Change in cost of debt |  |  | (0.41%) |
Change in return on rate base |  |  | (0.24%) |
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Federal Energy Regulatory Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighting |  | 43.44% |  |
Return on rate base |  | 4.21% |  |
Weighted return on rate base |  | 1.83% |  |
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 45.25% |
Return on rate base |  |  | 4.59% |
Weighted return on rate base |  |  | 2.08% |
San Diego Gas and Electric Company [Member] | Capital Structure, Preferred Stock [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 2.75% |
Return on rate base |  |  | 6.22% |
Weighted return on rate base |  |  | 0.17% |
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Federal Energy Regulatory Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighting |  | 56.56% |  |
Return on rate base |  | 10.05% |  |
Weighted return on rate base |  | 5.68% |  |
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 52.00% |
Return on rate base |  |  | 10.20% |
Weighted return on rate base |  |  | 5.30% |
Southern California Gas Company [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighted return on rate base |  | 8.02% |  |
Cost of debt |  | 5.77% |  |
Southern California Gas Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Weighted return on rate base |  |  | 7.34% |
Authorized weighting |  |  | 100.00% |
Cost of debt |  |  | 4.33% |
Change in cost of debt |  |  | (1.44%) |
Change in return on rate base |  |  | (0.68%) |
Southern California Gas Company [Member] | Capital Structure, Long Term Debt [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 45.60% |
Return on rate base |  |  | 4.33% |
Weighted return on rate base |  |  | 1.97% |
Southern California Gas Company [Member] | Capital Structure, Preferred Stock [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 2.40% |
Return on rate base |  |  | 6.00% |
Weighted return on rate base |  |  | 0.14% |
Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Authorized weighting |  |  | 52.00% |
Return on rate base |  |  | 10.05% |
Weighted return on rate base |  |  | 5.23% |
Sempra Mexico [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory assets |  | $ 7 |  |

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