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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.