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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 22 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 plaintiff | Sep. 30, 2021 USD ($) plaintiff lawsuit | Jun. 30, 2023 USD ($) lawsuit | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) lawsuit | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Jul. 31, 2023 plaintiff | Nov. 30, 2021 Bcf | Jan. 31, 2021 lawsuit
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  | $ 222 |  | $ 222 |  |  |  |  |
Natural gas inventory level (in bcf) | Bcf |  |  |  |  |  |  |  |  | 41.16 |
Aliso Canyon litigation and regulatory matters |  |  | 0 | $ 45 | 0 | $ 137 |  |  |  |
Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  | 126 |  | 126 |  |  |  |  |
Southern California Gas Company |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  | 142 |  | 142 |  |  |  |  |
Aliso Canyon litigation and regulatory matters |  |  | 0 | 45 | 0 | 137 |  |  |  |
Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  | 126 |  | 126 |  |  |  |  |
Number of lawsuits | lawsuit |  | 390 |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 36,000 |  |  |  |  |  |  |  |
Net book value of Aliso Canyon facility |  |  | 976 |  | 976 |  |  |  |  |
Reserve for Aliso Canyon costs |  |  | $ 126 |  | $ 126 |  |  |  |  |
Aliso Canyon litigation and regulatory matters, net of tax |  |  |  | $ 32 |  | $ 98 |  |  |  |
Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 243 |  |  |  |  |  |  |  |  |
Southern California Gas Company | Shareholder Derivative Complaint |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  | 4 |  | 4 |  |  |  |  | 3
Southern California Gas Company | Individual Plaintiff Litigation | Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Estimate of costs |  | $ 1,800 |  |  |  |  |  |  |  |
Percentage of plaintiffs agreeing to participate and submit releases (in percent) |  |  |  |  |  |  | 99.00% |  |  |
Payment of liquidating companies' costs |  |  |  |  |  |  | $ 1,790 |  |  |
Southern California Gas Company | The Developer Plaintiffs | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  |  |  | 388 |  |
San Diego Gas and Electric Company |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  | $ 6 |  | $ 6 |  |  |  |  |
Deferred Credits and Other | Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Reserve for Aliso Canyon costs |  |  | $ 2 |  | $ 2 |  |  |  |  |

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