v3.26.1
SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]      
Cost $ 684   $ 678
Gross unrealized gains 214   231
Gross unrealized losses (14)   (10)
Estimated fair value 884   899
Proceeds from sales 395 $ 329  
SDG&E      
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales 291 274  
Gross realized gains 9 10  
Gross realized losses 2 $ 2  
Short-term investments, primarily cash equivalents      
Debt Securities, Available-for-sale [Line Items]      
Cost 25   12
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Estimated fair value 25   12
Equity securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 66   69
Gross unrealized gains 208   221
Gross unrealized losses (2)   (2)
Estimated fair value 272   288
Total debt securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 601   600
Gross unrealized gains 6   10
Gross unrealized losses (12)   (8)
Estimated fair value 595   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   46
Gross unrealized gains 1   1
Gross unrealized losses (1)   0
Estimated fair value 43   47
Municipal bonds      
Debt Securities, Available-for-sale [Line Items]      
Cost 295   301
Gross unrealized gains 2   4
Gross unrealized losses (6)   (5)
Estimated fair value 291   300
Other securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 263   253
Gross unrealized gains 3   5
Gross unrealized losses (5)   (3)
Estimated fair value 261   255
Receivables (payables), net      
Debt Securities, Available-for-sale [Line Items]      
Cost (8)   (3)
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Estimated fair value $ (8)   $ (3)