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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 48,108 $ 43,624 [1]  
Depreciation 1,422 1,236 $ 1,178
Accumulated depreciation 11,605 10,693 [1]  
San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 19,787 17,844 [1]  
Depreciation 621 583 544
Accumulated depreciation 4,949 4,594 [1]  
Southern California Gas Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 16,772 15,344 [1]  
Depreciation 514 474 $ 459
Accumulated depreciation 5,366 5,092 [1]  
Natural gas operations [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 2,186 $ 1,897  
Depreciation rates (percentage) 2.40% 2.40% 2.52%
Accumulated depreciation $ 756 $ 721  
Natural gas operations [Member] | Southern California Gas Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 15,759 $ 14,428  
Depreciation rates (percentage) 3.63% 3.64% 3.83%
Capital leased assets $ 34 $ 32  
Accumulated depreciation 5,352 5,079  
Accumulated depreciation of capital leased assets 33 31  
Electric distribution [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 6,975 $ 6,497  
Depreciation rates (percentage) 3.92% 3.86% 3.79%
Accumulated depreciation $ 4,193 $ 3,873  
Accumulated depreciation of capital leased assets 47 39  
Electric transmission [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 5,626 $ 5,152  
Depreciation rates (percentage) 2.71% 2.66% 2.62%
Electric generation [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 2,435 $ 1,932  
Depreciation rates (percentage) 4.05% 4.00% 3.89%
Capital leased assets $ 757 $ 258  
Other electric [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 1,114 $ 1,059  
Depreciation rates (percentage) 5.54% 5.66% 5.73%
Capital leased assets $ 22 $ 21  
Other non-utility [Member] | Southern California Gas Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 32 $ 34  
Depreciation rates (percentage) 5.28% 6.55% 3.95%
Accumulated depreciation $ 14 $ 13  
Other non-utility [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation 972 755  
Construction work in progress [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 1,451 1,307  
Construction work in progress [Member] | Southern California Gas Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 981 882  
Land and land rights [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 416 381  
Land and land rights [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 22 years    
Land and land rights [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 55 years    
Land and land rights [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 33 years    
Utility electric distribution operations [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 1,751 1,519  
Accumulated depreciation $ 318 252  
Utility electric distribution operations [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 12 years    
Utility electric distribution operations [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 60 years    
Utility electric distribution operations [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 52 years    
Generating plants [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 2,242 1,874  
Generating plants [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 2 years    
Generating plants [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 100 years    
Generating plants [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 31 years    
LNG terminals [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 1,133 1,129  
LNG terminals [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 43 years    
LNG terminals [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 43 years    
LNG terminals [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 43 years    
Pipelines and storage [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 4,408 3,242  
Pipelines and storage [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Pipelines and storage [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 55 years    
Pipelines and storage [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 43 years    
Other [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 269 235  
Other [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 1 year    
Other [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 50 years    
Other [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 13 years    
Construction work in progress [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 691 1,488  
Other [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 639 568  
Capital leased assets $ 136 136  
Other [Member] | Minimum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 1 year    
Other [Member] | Maximum [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 80 years    
Other [Member] | Weighted Average [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 33 years    
Plant, pipeline and other distribution assets of ecogas [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation $ 39 33  
Plant, pipeline and other distribution assets of ecogas [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 145 128  
Total Other Operating Units And Parent [Member] | Other Operating Units and Parent [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 11,549 10,436  
Accumulated depreciation 1,290 $ 1,007  
Southwest Powerlink (SWPL) transmission line [Member] | Electric transmission [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 440    
Ownership interest 92.00%    
Accumulated depreciation $ 241    
Southwest Powerlink (SWPL) transmission line [Member] | Construction work in progress [Member] | San Diego Gas and Electric Company [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 29    
[1] Reflects reclassifications to conform to current year presentation, which we discuss in Note 1.