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COMMITMENTS AND CONTINGENCIES - SITE CONTINGENCY (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Site Contingency [Line Items]  
Accrual for environmental loss contingencies $ 37
Accrual for environmental loss contingencies, current 10
Accrual for environmental loss contingencies, noncurrent 27
Manufactured Gas Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 30
Waste Disposal Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 4
Other Hazardous Waste Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 3
San Diego Gas and Electric Company [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 5
Accrual for environmental loss contingencies, current 1
Accrual for environmental loss contingencies, noncurrent 4
Estimated SONGS mitigation costs, recoverable in rates 68
SONGS mitigation costs incurred 45
SONGS mitigation costs remaining $ 23
San Diego Gas and Electric Company [Member] | Manufactured Gas Sites [Member]  
Site Contingency [Line Items]  
Site Contingency, Sites Completed 3
Site Contingency, Sites In Process 0
Accrual for environmental loss contingencies $ 0
San Diego Gas and Electric Company [Member] | Waste Disposal Sites [Member]  
Site Contingency [Line Items]  
Site Contingency, Sites Completed 2
Site Contingency, Sites In Process 1
Accrual for environmental loss contingencies $ 2
San Diego Gas and Electric Company [Member] | Other Hazardous Waste Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 3
San Diego Gas and Electric Company [Member] | California Coastal Reef Expansion [Member]  
Site Contingency [Line Items]  
SONGS mitigation costs remaining 4
Southern California Gas Company [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 31
Accrual for environmental loss contingencies, current 9
Accrual for environmental loss contingencies, noncurrent $ 22
Southern California Gas Company [Member] | Manufactured Gas Sites [Member]  
Site Contingency [Line Items]  
Site Contingency, Sites Completed 39
Site Contingency, Sites In Process 3
Accrual for environmental loss contingencies $ 30
Southern California Gas Company [Member] | Waste Disposal Sites [Member]  
Site Contingency [Line Items]  
Site Contingency, Sites Completed 5
Site Contingency, Sites In Process 2
Accrual for environmental loss contingencies $ 1
Southern California Gas Company [Member] | Other Hazardous Waste Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 0
Other Sempra Energy [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 1
Other Sempra Energy [Member] | Manufactured Gas Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 0
Other Sempra Energy [Member] | Waste Disposal Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies 1
Other Sempra Energy [Member] | Other Hazardous Waste Sites [Member]  
Site Contingency [Line Items]  
Accrual for environmental loss contingencies $ 0