v3.8.0.1

COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
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May 03, 2018 plaintiff lawsuit | Jul. 19, 2017 Bcf | Mar. 13, 2017 | Mar. 31, 2016 t | Jan. 31, 2017 lawsuit | Sep. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) Bcf lawsuit | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | [1] | Oct. 21, 2016 t
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | $ 144,000,000 |  |  |
Percent of arbitration expenses reduction of award |  |  | 95.00% |  |  |  |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | 122,000,000 |  | $ 84,000,000 |
Insurance receivable for Aliso Canyon costs |  |  |  |  |  |  | $ 447,000,000 |  | 418,000,000 |
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 |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | $ 3,000,000 |  |  |
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 |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | 90,000,000 |  |  |
Insurance Settlements Receivable |  |  |  |  |  |  | 928,000,000 |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | 122,000,000 |  | 84,000,000 |
Insurance receivable for Aliso Canyon costs |  |  |  |  |  |  | 447,000,000 |  | $ 418,000,000 |
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for legal proceedings |  |  |  |  |  |  | 85,000,000 |  |  |
Loss contingency accrual |  |  |  |  |  |  | $ 954,000,000 |  |  |
Percent of Loss Accrual Allocated to Temporary Relocation Program |  |  |  |  |  |  | 60.00% |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  | $ 122,000,000 |  |  |
Receivable related to natural gas leak |  |  |  |  |  |  | 447,000,000 |  |  |
Insurance proceeds |  |  |  |  |  |  | $ 481,000,000 |  |  |
Period of required climate reductions |  |  |  | 20 years |  |  |  |  |  |
Period of required regulatory climate reductions |  |  |  | 100 years |  |  |  |  |  |
Target emissions level (in metric tons) | t |  |  |  | 9,000,000 |  |  |  |  |  |
Loss Contingency, Total Actual Emissions, Floor (in metric tons) | t |  |  |  |  |  |  |  |  |  | 90,350
Loss Contingency, Total Actual Emissions, Ceiling (in metric tons) | t |  |  |  |  |  |  |  |  |  | 108,950
Mitigation requirements (in metric tons) | t |  |  |  |  |  |  |  |  |  | 109,000
Amount of natural gas released | Bcf |  |  |  |  |  |  | 4.62 |  |  |
Required working gas target | Bcf |  | 23.6 |  |  |  |  |  |  |  |
Required working gas minimum | Bcf |  | 14.8 |  |  |  |  |  |  |  |
Storage facility capacity | Bcf |  |  |  |  |  |  | 86 |  |  |
Proportion of total gas storage capacity (percentage) |  | 28.00% |  |  |  |  | 63.00% |  |  |
Net book value of Aliso Canyon facility |  |  |  |  |  |  | $ 656,000,000 |  |  |
Construction work in progress of new compressor station |  |  |  |  |  |  | 259,000,000 |  |  |
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 | 381 |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 48,000 |  |  |  |  |  |  |  |  |
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 |  |  |
Environmental mitigation period |  |  |  | 5 years |  |  |  |  |  |
Required working gas target | Bcf |  | 0 |  |  |  |  |  |  |  |
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 |  |  |
Environmental mitigation period |  |  |  | 10 years |  |  |  |  |  |
Required working gas target | Bcf |  | 24.6 |  |  |  |  |  |  |  |
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 |  |  |  |
[1] | Derived from audited financial statements.

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