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SEGMENT INFORMATION (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 17 Months Ended
Apr. 30, 2019
segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
May 16, 2019
Segment Reporting Information [Line Items]                
Number of reportable segments | segment 6     5   5    
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   $ 2,644 $ 2,758 $ 8,199 $ 7,886      
INTEREST EXPENSE   264 279 818 797      
INTEREST INCOME   27 22 76 64      
DEPRECIATION AND AMORTIZATION   418 402 1,242 1,174      
Income tax expense from continuing operations   99 61 60 150      
Equity earnings (losses), before income tax:   117 17 158 24      
Equity earnings, net of income tax:   209 249 664 461      
Equity earnings   326 266 822 485      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   351 813 3,350 1,608      
Discontinued operations   (7) 248 1,840 267      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       3,313 2,590      
ASSETS   67,222   67,222   $ 67,222 $ 65,665 [1]  
EQUITY METHOD AND OTHER INVESTMENTS   13,417   13,417   13,417 13,622  
Operating Segments [Member] | SDG&E [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   1,472 1,427 3,976 3,666      
INTEREST EXPENSE   103 106 307 311      
INTEREST INCOME   1 1 2 3      
DEPRECIATION AND AMORTIZATION   200 196 598 571      
Income tax expense from continuing operations   33 71 161 111      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   178 263 633 582      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       1,323 1,071      
ASSETS   22,421   22,421   22,421 20,560  
Operating Segments [Member] | SoCalGas [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   842 975 3,247 3,142      
INTEREST EXPENSE   39 36 119 104      
INTEREST INCOME   0 0 2 1      
DEPRECIATION AND AMORTIZATION   165 154 486 449      
Income tax expense from continuing operations   (6) 35 95 50      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   (24) 143 425 437      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       1,345 1,019      
ASSETS   17,943   17,943   17,943 17,077  
Operating Segments [Member] | Sempra Texas Utilities [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
Equity earnings (losses), before income tax:   1 0 1 1      
Equity earnings, net of income tax:   208 212 457 418      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   209 212 458 419      
Segment Reporting Information, Additional Information [Abstract]                
ASSETS   12,063   12,063   12,063 11,619  
EQUITY METHOD AND OTHER INVESTMENTS   12,063   12,063   12,063 11,619  
Operating Segments [Member] | Sempra Mexico [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   351 357 935 1,058      
INTEREST EXPENSE   31 30 95 89      
INTEREST INCOME   14 20 47 58      
DEPRECIATION AND AMORTIZATION   47 46 141 136      
Income tax expense from continuing operations   92 0 (161) 116      
Equity earnings, net of income tax:   1 37 207 43      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   50 84 302 214      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       443 420      
ASSETS   10,730   10,730   10,730 9,938  
EQUITY METHOD AND OTHER INVESTMENTS   920   920   920 741  
Operating Segments [Member] | Sempra Renewables [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   0 0 0 10      
INTEREST EXPENSE   0 0 0 3      
INTEREST INCOME   0 0 0 11      
Income tax expense from continuing operations   0 0 0 4      
Equity earnings (losses), before income tax:   0 0 0 5      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   0 0 0 59      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       0 2      
Operating Segments [Member] | Sempra LNG [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   63 100 255 327      
INTEREST EXPENSE   8 11 39 18      
INTEREST INCOME   25 15 65 45      
DEPRECIATION AND AMORTIZATION   2 2 7 7      
Income tax expense from continuing operations   18 (2) 59 4      
Equity earnings (losses), before income tax:   116 17 257 19      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   71 2 207 13      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       196 74      
ASSETS   3,643   3,643   3,643 3,901  
EQUITY METHOD AND OTHER INVESTMENTS   433   433   433 1,256  
Corporate, Non-Segment [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   0 1 1 1      
INTEREST EXPENSE   93 117 304 336      
INTEREST INCOME   0 1 3 2      
DEPRECIATION AND AMORTIZATION   4 4 10 11      
Income tax expense from continuing operations   (38) (43) (94) (135)      
Equity earnings (losses), before income tax:   0 0 (100) (1)      
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES   (126) (139) (515) (383)      
Segment Reporting Information, Additional Information [Abstract]                
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT       6 4      
ASSETS   2,398   2,398   2,398 749  
EQUITY METHOD AND OTHER INVESTMENTS   1   1   1 6  
Segment Reconciling Items [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   2 (2) 0 (3)      
Discontinued operations   (7) 248 1,840 267      
Segment Reporting Information, Additional Information [Abstract]                
Discontinued operations   0   0   0 3,958  
Intersegment eliminations [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   (86) (100) (215) (315)      
INTEREST EXPENSE   (10) (21) (46) (64)      
INTEREST INCOME   (13) (15) (43) (56)      
Segment Reporting Information, Additional Information [Abstract]                
ASSETS   (1,976)   (1,976)   $ (1,976) $ (2,137)  
Intersegment eliminations [Member] | SDG&E [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   1 1 4 4      
Intersegment eliminations [Member] | SoCalGas [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   23 16 61 50      
Intersegment eliminations [Member] | Sempra Mexico [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   12 29 69 89      
Intersegment eliminations [Member] | Sempra LNG [Member]                
Segment Reporting Information, Profit (Loss) [Abstract]                
REVENUES   $ 50 $ 54 $ 81 $ 172      
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utilities [Member]                
Segment Reporting Information [Line Items]                
Ownership interest (as a percent)   80.25%   80.25%   80.25%    
Sharyland Holdings, LP [Member] | Sempra Texas Utilities [Member]                
Segment Reporting Information [Line Items]                
Acquired percentage interest               50.00%
[1] Derived from audited financial statements.