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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]          
Cost $ 690   $ 690   $ 678
Gross unrealized gains 233   233   231
Gross unrealized losses (32)   (32)   (10)
Estimated fair value 891   891   899
Proceeds from sales     942 $ 831  
San Diego Gas and Electric Company          
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sales 256 $ 210 772 709  
Gross realized gains 12 12 32 43  
Gross realized losses 3 $ 1 7 $ 6  
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 230   230   221
Gross unrealized losses (2)   (2)   (2)
Estimated fair value 294   294   288
Total debt securities          
Debt Securities, Available-for-sale [Line Items]          
Cost 613   613   600
Gross unrealized gains 3   3   10
Gross unrealized losses (30)   (30)   (8)
Estimated fair value 586   586   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 43   43   46
Gross unrealized gains 2   2   1
Gross unrealized losses (2)   (2)   0
Estimated fair value 43   43   47
Municipal bonds          
Debt Securities, Available-for-sale [Line Items]          
Cost 304   304   301
Gross unrealized gains 0   0   4
Gross unrealized losses (17)   (17)   (5)
Estimated fair value 287   287   300
Other securities          
Debt Securities, Available-for-sale [Line Items]          
Cost 266   266   253
Gross unrealized gains 1   1   5
Gross unrealized losses (11)   (11)   (3)
Estimated fair value 256   256   255
Receivables (payables), net          
Debt Securities, Available-for-sale [Line Items]          
Cost (8)   (8)   (3)
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Estimated fair value $ (8)   $ (8)   $ (3)