v3.25.2
FAIR VALUE MEASUREMENTS - Narrative (Details) - Spent Nuclear Fuel and Decommissioning Trusts - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjusted cost of debt securities $ 1,600 $ 1,500
Adjusted cost of equity securities 564 549
I&M    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjusted cost of debt securities 1,600 1,500
Adjusted cost of equity securities $ 564 $ 549