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Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares
 1 Months Ended 9 Months Ended
Jul. 08, 2025
Jun. 02, 2025
Oct. 31, 2025
Sep. 30, 2025
Schedule of Stock by Class, Equity [Roll Forward]        
Preferred, Balance as of beginning of period (in shares)     650,000 650,000
Preferred, Balance as of end of period (in shares)       650,000
Common, Balance as of beginning of period (in shares)     199,704,187 205,064,058
Treasury, Balance as of beginning of period (in shares)     (7,448,883) (6,460,055)
Common, Outstanding, as of beginning of period (in shares)     192,255,304 198,604,003
Shares repurchased (in shares)       (7,874,491)
Settlement of Capped Call Options (in shares)       (4,211,054)
Conversion of Convertible Senior Notes (in shares)       3,986,469
Retirement of treasury stock (in shares) (224,585)      
Common, Balance as of end of period (in shares)       199,704,187
Treasury, Balance as of end of period (in shares)       (7,448,883)
Common, Outstanding, as of end of period (in shares)       192,255,304
Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares repurchased (in shares)     (772,500)  
Common, Outstanding, as of end of period (in shares)     191,639,408  
Shares issued under LTIPs        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)       1,668,474
Shares issued under LTIPs | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)     62,600  
Shares issued under ESPP        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)       81,903
Shares issued under ESPP | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)     94,004  
Preferred Stock        
Schedule of Stock by Class, Equity [Roll Forward]        
Preferred, Balance as of beginning of period (in shares)     650,000 650,000
Preferred, Balance as of end of period (in shares)       650,000
Preferred Stock | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Preferred, Balance as of end of period (in shares)     650,000  
Common Stock        
Schedule of Stock by Class, Equity [Roll Forward]        
Common, Balance as of beginning of period (in shares)     199,704,187 205,064,058
Settlement of Capped Call Options (in shares)       0
Retirement of treasury stock (in shares)       (7,028,345)
Common, Balance as of end of period (in shares)       199,704,187
Common Stock | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Common, Balance as of end of period (in shares)     199,766,787  
Common Stock | Shares issued under LTIPs        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)       1,668,474
Common Stock | Shares issued under LTIPs | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)     62,600  
Common Stock | Shares issued under ESPP | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)     0  
Treasury Stock        
Schedule of Stock by Class, Equity [Roll Forward]        
Treasury, Balance as of beginning of period (in shares)     (7,448,883) (6,460,055)
Shares repurchased (in shares)       (7,874,491)
Settlement of Capped Call Options (in shares) (4,210,920) (134)   (4,211,054)
Conversion of Convertible Senior Notes (in shares)       3,986,469
Retirement of treasury stock (in shares)       7,028,345
Treasury, Balance as of end of period (in shares)       (7,448,883)
Treasury Stock | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares repurchased (in shares)     (772,500)  
Treasury, Balance as of end of period (in shares)     (8,127,379)  
Treasury Stock | Shares issued under ESPP        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)       81,903
Treasury Stock | Shares issued under ESPP | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)     94,004