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COMMITMENTS AND CONTINGENCIES - LOSS ON CONTINGENCIES (Details) £ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 21, 2019 plaintiff lawsuit | Oct. 31, 2018 plaintiff | Aug. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jan. 31, 2017 lawsuit | Sep. 30, 2016 USD ($) | Oct. 31, 2017 lawsuit | Sep. 30, 2018 USD ($) lawsuit | Dec. 31, 2018 USD ($) Bcf proof_of_claim | Dec. 31, 2018 GBP (£) Bcf | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | [1] | Oct. 21, 2016 t | Oct. 01, 2014 USD ($) | Oct. 01, 2014 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Write-off of wildfire regulatory asset |  |  |  |  |  |  |  |  | 0 |  | $ 351,000,000 | [1] | $ 0 |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  |  |  | 160,000,000 |  | 84,000,000 |  |  |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Write-off of wildfire regulatory asset |  |  |  |  |  |  |  |  | 0 |  | 351,000,000 | [1] | $ 0 |  |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  | 147,000,000 |  |  |  |  |  |  |
Recoverable costs through insurance settlement |  |  |  |  |  |  |  |  | 1,027,000,000 |  |  |  |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  |  |  | $ 160,000,000 |  | 84,000,000 |  |  |  |  |
Energy Future Holdings Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proof of claims | proof_of_claim |  |  |  |  |  |  |  |  | 28,000 |  |  |  |  |  |  |
Loss from Catastrophes, 2007 Wildfire [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of wildfire regulatory asset |  |  |  | $ 351,000,000 |  |  |  |  |  |  | 351,000,000 |  |  |  |  |
Write-off of wildfire regulatory asset net of tax |  |  |  | $ 208,000,000 |  |  |  |  |  |  | $ 208,000,000 |  |  |  |  |
Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  | $ 136,000,000 |  |  |  |  |  |  |
Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of natural gas released | Bcf |  |  |  |  |  |  |  |  | 4.62 | 4.62 |  |  |  |  |  |
Mitigation requirement | t |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,000 |  |
Recorded estimated costs |  |  |  |  |  |  |  |  | $ 1,055,000,000 |  |  |  |  |  |  |
Perecentage of recorded estimated costs allocated to temporary relocation program |  |  |  |  |  |  |  |  | 54.00% |  |  |  |  |  |  |
Reserve for Aliso Canyon costs |  |  |  |  |  |  |  |  | $ 160,000,000 |  |  |  |  |  |  |
Insurance receivable for Aliso Canyon costs |  |  |  |  |  |  |  |  | 461,000,000 |  |  |  |  |  |  |
Proceeds from insurance settlement |  |  |  |  |  |  |  |  | $ 566,000,000 |  |  |  |  |  |  |
Storage facility maximum capacity | Bcf |  |  |  |  |  |  |  |  | 86 |  |  |  |  |  |  |
Aliso Canyon facility as a percentage of SoCalGas total storage capacity |  |  |  |  |  |  |  |  | 63.00% |  |  |  |  |  |  |
Storage Facility, Working Gas Target | Bcf |  |  |  |  |  |  |  |  | 34 |  |  |  |  |  |  |
Net book value Of Aliso Canyon Natural Gas Storage Facility |  |  |  |  |  |  |  |  | $ 724,000,000 |  |  |  |  |  |  |
Damages from Product Defects [Member] | Southern California Gas Company [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 |  |  |  |  |  |  |  |  |  |
HMRC VAT Claim [Member] | R B S Sempra Commodities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VAT tax claim paid upon appeal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 138,000,000 |
HMRC VAT Claim [Member] | Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  | 91,000,000 | £ 71.5 |  |  |  |  |  |
HMRC VAT Claim [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VAT tax claim paid upon appeal | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 86.0
Minimum [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |
Maximum [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |
Consolidated Class Action Complaints [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |
Property Class Action [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Complaints Filed by Firefighters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 51 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaints Filed by Public Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
R B S Sempra Commodities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in RBS Sempra Commodities LLP |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |  |  |  |  |
Funding for Environmental Projects [Member] | Complaints Filed by Public Entities [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount payable |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Civil Penalties [Member] | Complaints Filed by Public Entities [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount payable |  |  | $ 21,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Energy Future Holdings Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit | 1,685 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | lawsuit | 119 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit | 393 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 48,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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