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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Narrative (Details)
$ in Millions
1 Months Ended
Apr. 30, 2026
USD ($)
investment
Jan. 31, 2026
USD ($)
investment
Aug. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
boardMember
Dec. 31, 2025
USD ($)
Nov. 30, 2025
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]            
Equity method investments       $ 1,299 $ 1,252  
Variable Interest Entity, Not Primary Beneficiary | OHIO POWER COMPANY            
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]            
Cost method investment ownership percentage         4.30% 4.30%
Power participation ratio         19.93% 19.93%
Gigawatt.AI            
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]            
Payments to acquire equity method investments   $ 25 $ 100      
Equity method investment, ownership percentage     10.00%      
Number of investments | investment   2        
Incremental ownership percentage   2.50%        
Equity method investments       $ 125    
Equity method investment, right to designate, number of board members | boardMember       1    
Equity method investment, number of board members | boardMember       3    
Gigawatt.AI | Subsequent Event            
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]            
Payments to acquire equity method investments $ 25          
Equity method investment, ownership percentage 15.00%          
Number of investments | investment 2          
Incremental ownership percentage 2.50%          
Equity method investments $ 150          
Potential payments to acquire equity method investments $ 50          
Potential incremental ownership percentage 5.00%          
Gigawatt.AI | Gigawatt AI Warrant            
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]            
Percentage of ownership in investment called by warrants     5.00%      
Amount of investment called by warrant     $ 50