v3.25.1
INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Mar. 31, 2024
Mar. 25, 2024
Dec. 31, 2023
Aug. 16, 2022
Provision For Income Tax [Line Items]          
Operating loss carryforwards, not subject to expiration, net of tax         $ 1,000
Deferred tax liabilities, net   $ 46      
Reduction to OPIC   $ 803      
Operating Loss Carryforwards       $ 8,100  
Forecast          
Provision For Income Tax [Line Items]          
Operating loss carryforwards, subject to expiration $ 1,600        
North American Transmission Company II LLC | FET          
Provision For Income Tax [Line Items]          
Tax gain from combined sale     $ 7,000    
Sale of ownership interest by parent   19.90% 49.90%