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GENERAL INFORMATION AND OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]        
Income tax expense (benefit) $ 14 $ 482 $ 191 $ 711
(Loss) income before income taxes 460 160 1,815 1,109
Equity earnings, before income tax 143 133 458 443
Pretax income $ 603 $ 293 $ 2,273 $ 1,552
Effective income tax rate (as a percent) 2.00% 165.00% 8.00% 46.00%
San Diego Gas and Electric Company        
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]        
Income tax expense (benefit) $ 76 $ (33) $ 184 $ (12)
(Loss) income before income taxes $ 452 $ 291 $ 1,046 $ 768
Effective income tax rate (as a percent) 17.00% (11.00%) 18.00% (2.00%)
Southern California Gas Company        
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]        
Income tax expense (benefit) $ (115) $ (95) $ (95) $ (51)
(Loss) income before income taxes $ (262) $ (49) $ 290 $ 523
Effective income tax rate (as a percent) 44.00% 194.00% (33.00%) (10.00%)