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Acquisitions - Acquisitions Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 10, 2025
USD ($)
facility
MW
Mar. 31, 2026
USD ($)
GW
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
May 12, 2025
USD ($)
Business Combination [Line Items]              
Number of power generating facilities acquired | facility 6            
Acquisition-related transaction and integration costs     $ 43 $ 6 $ 51 $ 15  
Senior Secured Bridge Facility | Bridge Loan              
Business Combination [Line Items]              
Revolving credit commitments             $ 4,400
LS Power Portfolio              
Business Combination [Line Items]              
Acquisition-related transaction and integration costs     23   23    
LS Power Portfolio | Senior Secured Bridge Facility | Bridge Loan              
Business Combination [Line Items]              
Revolving credit commitments             $ 4,400
LS Power Portfolio | Subsequent Event | Forecast              
Business Combination [Line Items]              
Acquisition, shares issued (in shares) | shares   24,250,000          
Cash paid to acquire business   $ 6,400          
Acquisition, liabilities assumed   3,200          
Acquisition termination fee   $ 400          
LS Power Portfolio | Natural Gas | Subsequent Event | Forecast              
Business Combination [Line Items]              
Number of power generating facilities acquired | GW   13          
LS Power Portfolio | Commercial And industrial Virtual Power Plant Platform | Subsequent Event | Forecast              
Business Combination [Line Items]              
Number of power generating facilities acquired | GW   6          
Texas Generation Portfolio              
Business Combination [Line Items]              
Acquisition-related transaction and integration costs     $ 6   $ 6    
Generation capacity (in MW) | MW 738            
Consideration $ 560            
Working capital adjustments $ 1