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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 09, 2018
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
MW
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Variable Interest Entity [Line Items]                        
Operation and maintenance                   $ 3,309 $ 3,096 [1] $ 2,976 [1]
Depreciation and amortization                   1,549 1,490 [1] 1,312 [1]
ASSETS                        
Cash and cash equivalents   $ 190       $ 288       190 288  
Restricted cash   35       62       35 62  
Inventories   296       307       296 307  
Other   257       202       257 202  
Total current assets   3,645       3,341       3,645 3,341  
Sundry   974       792       974 792  
Restricted cash   21       14       21 14  
Property, plant and equipment, net   36,796       36,503       36,796 36,503  
Total assets   60,638       50,454       60,638 50,454 47,786
Liabilities [Abstract]                        
Current portion of long-term debt   1,673       1,427       1,673 1,427  
Other   970       816       970 816  
Total current liabilities   7,523       6,635       7,523 6,635  
Asset retirement obligations   2,787       2,732       2,787 2,732  
Deferred income taxes   2,571       2,767       2,571 2,767  
Long-term debt   21,611       16,445       21,611 16,445  
Equity [Abstract]                        
Total liabilities and equity   60,638       50,454       60,638 50,454  
Net assets less other noncontrolling interests   17,138       12,670       17,138 12,670  
Operating Expenses [Abstract]                        
Energy-related businesses                   1,641 1,431 [1] 922 [1]
Income before income taxes                   1,046 1,551 [1] 1,824 [1]
Other income, net                   72 233 [1] 138 [1]
Interest expense                   (925) (659) [1] (553) [1]
Income tax expense                   (96) (1,276) [1] (389) [1]
Net income   964 $ 334 $ (530) $ 358 (451) $ 102 $ 248 $ 452 1,126 351 [1] 1,519 [1]
(Earnings) losses attributable to noncontrolling interest                   (76) (94) [1] (148) [1]
Earnings attributable to common shares   864 274 (561) 347 (501) 57 259 441      
Equity method investment   9,652       0       9,652 0  
Otay Mesa VIE [Member]                        
Liabilities [Abstract]                        
Current portion of long-term debt   28       10       28 10  
San Diego Gas and Electric Company [Member]                        
Variable Interest Entity [Line Items]                        
Operation and maintenance                   1,058 1,024 [1] 1,062 [1]
Depreciation and amortization                   688 670 [1] 646 [1]
Investments [Abstract]                        
Gross long-term debt   4,776       4,573       4,776 4,573  
ASSETS                        
Cash and cash equivalents   8       12       8 12  
Restricted cash   11       6       11 6  
Inventories   102       105       102 105  
Other   5       4       5 4  
Total current assets   894       1,100       894 1,100  
Sundry   420       328       420 328  
Restricted cash   18       11       18 11  
Property, plant and equipment, net   16,310       14,838       16,310 14,838  
Total assets   19,225       17,844       19,225 17,844  
Liabilities [Abstract]                        
Current portion of long-term debt   81       220       81 220  
Other   141       147       141 147  
Total current liabilities   1,428       1,622       1,428 1,622  
Asset retirement obligations   778       762       778 762  
Deferred income taxes   1,616       1,530       1,616 1,530  
Long-term debt   6,138       5,335       6,138 5,335  
Equity [Abstract]                        
Total liabilities and equity   19,225       17,844       19,225 17,844  
Net assets less other noncontrolling interests   6,015       5,598       6,015 5,598  
Operating Expenses [Abstract]                        
Income before income taxes                   849 576 [1] 845 [1]
Operating income   247 300 215 248 256 (58) 237 274 1,010 709 [1] 976 [1]
Other income, net                   56 70 [1] 64 [1]
Interest expense                   (221) (203) [1] (195) [1]
Income tax expense                   (173) (155) [1] (280) [1]
Net income   145 216 146 169 130 (19) 153 157 676 421 [1] 565 [1]
(Earnings) losses attributable to noncontrolling interest   3 $ (11) $ 0 $ 1 1 $ (9) $ (4) $ (2) (7) (14) [1] 5 [1]
San Diego Gas and Electric Company [Member] | Otay Mesa VIE [Member]                        
Variable Interest Entity [Line Items]                        
Utility Operating Revenue, Fuel                   (75) (79) (79)
Operation and maintenance                   17 17 29
Depreciation and amortization                   $ 30 28 35
Investments [Abstract]                        
Generating capacity (in mw) | MW                   605    
Put option   280               $ 280    
Equity of Variable interest entity   100       28       100 28  
ASSETS                        
Cash and cash equivalents   0       4       0 4  
Restricted cash   11       6       11 6  
Inventories   4       4       4 4  
Other   2       1       2 1  
Total current assets   17       15       17 15  
Restricted cash   18       11       18 11  
Property, plant and equipment, net   295       321       295 321  
Total assets   330       347       330 347  
Liabilities [Abstract]                        
Current portion of long-term debt   28       10       28 10  
Fixed-price contracts and other derivatives   1       10       1 10  
Other   3       5       3 5  
Total current liabilities   32       25       32 25  
Long-term debt   190       284       190 284  
Fixed-price contracts and other derivatives   0       3       0 3  
Deferred credits and other   8       7       8 7  
Equity [Abstract]                        
Other noncontrolling interests   100       28       100 28  
Total liabilities and equity   330       347       330 347  
Operating Expenses [Abstract]                        
Total operating expenses                   (28) (34) (15)
Operating income                   28 34 15
Other income, net                   2 2 0
Interest expense                   (23) (22) (20)
Net income                   7 14 (5)
(Earnings) losses attributable to noncontrolling interest                   (7) (14) 5
Earnings attributable to common shares                   0 0 0
Sempra Renewables [Member]                        
ASSETS                        
Inventories   0       5       0 5  
Sempra Renewables [Member] | Noncontrolling Tax Equity Investors [Member]                        
Variable Interest Entity [Line Items]                        
Operation and maintenance                   16 9 1
Depreciation and amortization                   47 32 0
ASSETS                        
Cash and cash equivalents   7       23       7 23  
Accounts receivable – trade, net   2       5       2 5  
Inventories   0       1       0 1  
Other   1       1       1 1  
Total current assets   10       30       10 30  
Sundry   0       2       0 2  
Property, plant and equipment, net   286       1,412       286 1,412  
Total assets   296       1,444       296 1,444  
Liabilities [Abstract]                        
Accounts payable   2       42       2 42  
Other   1       1       1 1  
Total current liabilities   3       43       3 43  
Asset retirement obligations   6       40       6 40  
Deferred income taxes   7       10       7 10  
Deferred credits and other   0       1       0 1  
Total liabilities   16       94       16 94  
Equity [Abstract]                        
Other noncontrolling interests   158       631       158 631  
Net assets less other noncontrolling interests   122       719       122 719  
Operating Expenses [Abstract]                        
Energy-related businesses                   92 61 2
Income before income taxes                   29 20 1
Income tax expense                   (18) (4) 0
Net income                   11 16 1
(Earnings) losses attributable to noncontrolling interest                   58 23 4
Earnings attributable to common shares                   69 39 $ 5
Disposal of PP&E,net and other assets and liabilities   1,100               1,100    
Sempra LNG & Midstream [Member]                        
ASSETS                        
Inventories   3       34       3 34  
Sempra LNG & Midstream [Member] | Cameron LNG Holdings [Member]                        
Operating Expenses [Abstract]                        
Equity method investment   1,271       997       1,271 997  
Otay Mesa Energy Center Loan Payable 2019 through 2024 [Member] | San Diego Gas and Electric Company [Member] | Otay Mesa VIE [Member]                        
Investments [Abstract]                        
Gross long-term debt   220       $ 0       220 $ 0  
Oncor Holdings Electric Delivery Company LLC [Member]                        
Operating Expenses [Abstract]                        
Acquired percentage interest 80.25%                      
Oncor Holdings Electric Delivery Company LLC [Member] | Sempra Texas Utility [Member]                        
Operating Expenses [Abstract]                        
Commitment to invest   1,025               1,025    
Equity method investment   $ 9,652               9,652    
Management agreement termination fee                   $ 40    
Oncor Electric Delivery Company LLC [Member]                        
Operating Expenses [Abstract]                        
Acquired percentage interest 80.25%                      
Sempra Texas Holdings Corp [Member] | Oncor Holdings Electric Delivery Company LLC [Member] | Sempra Texas Intermediate Holding Company LLC [Member]                        
Operating Expenses [Abstract]                        
Ownership percentage in consolidated entity 100.00%                      
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC [Member]                        
Operating Expenses [Abstract]                        
Acquired percentage interest 80.03%                      
[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.