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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) |  |  | 1 Months Ended | 3 Months Ended |  |
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May 02, 2019 plaintiff lawsuit | Feb. 18, 2016 Bcf | Oct. 31, 2018 plaintiff | Aug. 31, 2018 USD ($) | Jan. 31, 2017 lawsuit | Feb. 29, 2016 USD ($) | Mar. 31, 2019 USD ($) Bcf lawsuit | Sep. 30, 2018 lawsuit | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | [1] | Oct. 21, 2016 t
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | $ 104,000,000 |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | $ 60,000,000 |  |  | $ 160,000,000 |
Consolidated Class Action Complaints [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | lawsuit |  |  |  |  | 2 |  |  |  |  |  |
Property Class Action [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | lawsuit |  |  |  |  | 1 |  |  |  |  |  |
Complaints Filed by Public Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | lawsuit |  |  |  |  |  |  | 3 | 3 |  |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | $ 54,000,000 |  |  |  |
Insurance Settlements Receivable |  |  |  |  |  |  | 1,043,000,000 |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | 60,000,000 |  |  | $ 160,000,000 |
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | 53,000,000 |  |  |  |
Amount of natural gas released | Bcf |  | 4.62 |  |  |  |  |  |  |  |  |
Mitigation requirements (in metric tons) | t |  |  |  |  |  |  |  |  |  |  | 109,000
Loss contingency accrual |  |  |  |  |  |  | $ 1,071,000,000 |  |  |  |
Percent of Loss Accrual Allocated to Temporary Relocation Program |  |  |  |  |  |  | 53.00% |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | $ 60,000,000 |  |  |  |
Receivable related to natural gas leak |  |  |  |  |  |  | 477,000,000 |  |  |  |
Insurance proceeds |  |  |  |  |  |  | $ 566,000,000 |  |  |  |
Storage facility capacity | Bcf |  |  |  |  |  |  | 86 |  |  |  |
Proportion of total gas storage capacity (percentage) |  |  |  |  |  |  | 63.00% |  |  |  |
Storage Facility, Working Gas Target | Bcf |  |  |  |  |  |  | 34 |  |  |  |
Net book value of Aliso Canyon facility |  |  |  |  |  |  | $ 741,000,000 |  |  |  |
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit | 394 |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 48,500 |  |  |  |  |  |  |  |  |  |
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  | 1,200,000,000 |  |  |  |
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |
Southern California Gas Company [Member] | Damages from Product Defects [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum occupational safety and health fines |  |  |  |  |  | $ 75,000 |  |  |  |  |
Penalty assessments |  |  |  |  |  | 233,500 |  |  |  |  |
Maximum other assessments in settlement of criminal complaint |  |  |  |  |  | $ 6,000,000 |  |  |  |  |
Southern California Gas Company [Member] | Complaints Filed by Firefighters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  | 51 |  |  |  |  |  |  |  |
Southern California Gas Company [Member] | Complaints Filed by Public Entities [Member] | Funding for Environmental Projects [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement amount payable |  |  |  | $ 120,000,000 |  |  |  |  |  |  |
Southern California Gas Company [Member] | Complaints Filed by Public Entities [Member] | Civil Penalties [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement amount payable |  |  |  | $ 21,000,000 |  |  |  |  |  |  |
San Diego Gas and Electric Company [Member] | Wildfire [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Write-off of wildfire regulatory asset |  |  |  |  |  |  |  |  | $ 351,000,000 |  |
After-tax charge for nonrecovery of CPUC regulatory assets |  |  |  |  |  |  |  |  | $ 208,000,000 |  |
Energy Future Holdings Corp. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit | 114 |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | lawsuit | 1,685 |  |  |  |  |  |  |  |  |  |
[1] | Derived from audited financial statements.

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