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Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares
 1 Months Ended 6 Months Ended
Jul. 30, 2025
Jul. 08, 2025
Jul. 31, 2025
Jun. 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)     201,087,779 205,064,058
Treasury, Balance as of beginning of period (in shares)     (6,457,685) (6,460,055)
Common, Outstanding, as of beginning of period (in shares)     194,630,094 198,604,003
Shares repurchased (in shares)       (5,594,139)
Settlement of Capped Call Options (in shares)       (134)
Conversion of Convertible Senior Notes (in shares)       134
Common, Balance as of end of period (in shares)       201,087,779
Treasury, Balance as of end of period (in shares)       (6,457,685)
Common, Outstanding, as of end of period (in shares)       194,630,094
Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares repurchased (in shares)     (988,749)  
Settlement of Capped Call Options (in shares)     (4,210,920)  
Conversion of Convertible Senior Notes (in shares)     3,986,335  
Retirement of treasury stock (in shares) (224,585)      
Common, Outstanding, as of end of period (in shares)     193,430,802  
Shares issued under LTIPs        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)       1,538,327
Shares issued under LTIPs | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)     14,042  
Shares issued under ESPP        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)       81,903
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)     201,087,779 205,064,058
Settlement of Capped Call Options (in shares)       0
Retirement of treasury stock (in shares)       (5,514,606)
Common, Balance as of end of period (in shares)       201,087,779
Common Stock | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Retirement of treasury stock (in shares)     (1,091,281)  
Common, Balance as of end of period (in shares)     200,010,540  
Common Stock | Shares issued under LTIPs        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)       1,538,327
Common Stock | Shares issued under LTIPs | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under LTIPs (in shares)     14,042  
Treasury Stock        
Schedule of Stock by Class, Equity [Roll Forward]        
Treasury, Balance as of beginning of period (in shares)     (6,457,685) (6,460,055)
Shares repurchased (in shares)       (5,594,139)
Settlement of Capped Call Options (in shares)       (134)
Conversion of Convertible Senior Notes (in shares)       134
Retirement of treasury stock (in shares)       5,514,606
Treasury, Balance as of end of period (in shares)       (6,457,685)
Treasury Stock | Subsequent Event        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares repurchased (in shares)     (988,749)  
Settlement of Capped Call Options (in shares)   (4,210,920) (4,210,920)  
Conversion of Convertible Senior Notes (in shares)     3,986,335  
Retirement of treasury stock (in shares)     1,091,281  
Treasury, Balance as of end of period (in shares)     (6,579,738)  
Treasury Stock | Shares issued under ESPP        
Schedule of Stock by Class, Equity [Roll Forward]        
Shares issued under ESPP (in shares)       81,903