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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]          
Cost $ 686   $ 686   $ 678
Gross unrealized gains 245   245   231
Gross unrealized losses (11)   (11)   (10)
Estimated fair value 920   920   899
Proceeds from sales     679 $ 580  
SDG&E          
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sales 225 $ 225 516 499  
Gross realized gains 11 21 20 31  
Gross realized losses 2 $ 3 4 $ 5  
Short-term investments, primarily cash equivalents          
Debt Securities, Available-for-sale [Line Items]          
Cost 19   19   12
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Estimated fair value 19   19   12
Equity securities          
Debt Securities, Available-for-sale [Line Items]          
Cost 66   66   69
Gross unrealized gains 239   239   221
Gross unrealized losses (2)   (2)   (2)
Estimated fair value 303   303   288
Total debt securities          
Debt Securities, Available-for-sale [Line Items]          
Cost 612   612   600
Gross unrealized gains 6   6   10
Gross unrealized losses (9)   (9)   (8)
Estimated fair value 609   609   602
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies          
Debt Securities, Available-for-sale [Line Items]          
Cost 45   45   46
Gross unrealized gains 1   1   1
Gross unrealized losses (1)   (1)   0
Estimated fair value 45   45   47
Municipal bonds          
Debt Securities, Available-for-sale [Line Items]          
Cost 301   301   301
Gross unrealized gains 3   3   4
Gross unrealized losses (4)   (4)   (5)
Estimated fair value 300   300   300
Other securities          
Debt Securities, Available-for-sale [Line Items]          
Cost 266   266   253
Gross unrealized gains 2   2   5
Gross unrealized losses (4)   (4)   (3)
Estimated fair value 264   264   255
Receivables (payables), net          
Debt Securities, Available-for-sale [Line Items]          
Cost (11)   (11)   (3)
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Estimated fair value $ (11)   $ (11)   $ (3)