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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended | 25 Months Ended | 48 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 plaintiff | Sep. 30, 2021 USD ($) lawsuit plaintiff | Jan. 31, 2021 lawsuit | Sep. 30, 2023 USD ($) lawsuit | Sep. 30, 2022 USD ($) | Feb. 11, 2016 well | Sep. 30, 2023 USD ($) segment lawsuit | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Oct. 31, 2023 plaintiff | Dec. 31, 2021 claimant lawsuit | Aug. 31, 2023 Bcf | Nov. 30, 2021 Bcf | Mar. 31, 2021 lawsuit
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  | $ 203 |  |  | $ 203 |  |  |  |  |  |  |
Natural gas inventory level (in bcf) | Bcf |  |  |  |  |  |  |  |  |  |  |  | 68.6 | 41.16 |
Aliso Canyon litigation and regulatory matters |  |  |  | 0 | $ 122 |  | $ 0 | $ 259 |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Sempra Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of claimants | claimant |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of reportable segments | segment |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  | 125 |  |  | $ 125 |  |  |  |  |  |  |
Southern California Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  | 127 |  |  | 127 |  |  |  |  |  |  |
Wells with gas leak | well |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Aliso Canyon litigation and regulatory matters |  |  |  | 0 | 122 |  | 0 | 259 |  |  |  |  |  |
Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  | 125 |  |  | 125 |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  | 390 |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 36,000 |  |  |  |  |  |  |  |  |  |  |  |
Net book value of Aliso Canyon facility |  |  |  | 993 |  |  | 993 |  |  |  |  |  |  |
Aliso Canyon litigation and regulatory matters, net of tax |  |  |  |  | $ 101 |  |  | $ 199 |  |  |  |  |  |
Reserve for Aliso Canyon costs |  |  |  | $ 126 |  |  | $ 126 |  |  |  |  |  |  |
Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 233 |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Gas Company | Shareholder Derivative Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  | 4 |  |  | 4 |  |  |  |  |  |  |
Claims dismissed | lawsuit |  |  | 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 |  |  |  |  |  |  |  |  |  | 394 |  |  |  |
San Diego Gas and Electric Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
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 |  |  |  | $ 3 |  |  | $ 3 |  |  |  |  |  |  |

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