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Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares
 1 Months Ended 3 Months Ended
Apr. 30, 2025
Mar. 31, 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) 203,061,220 205,064,058
Treasury, Balance as of beginning of period (in shares) (6,599,095) (6,460,055)
Common, Outstanding, as of beginning of period (in shares) 196,462,125 198,604,003
Shares repurchased (in shares)   (3,210,036)
Common, Balance as of end of period (in shares)   203,061,220
Treasury, Balance as of end of period (in shares)   (6,599,095)
Common, Outstanding, as of end of period (in shares)   196,462,125
Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares repurchased (in shares) (1,355,371)  
Common, Outstanding, as of end of period (in shares) 195,510,428  
Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,068,158
Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 321,771  
Shares issued under ESPP | Subsequent Event    
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) 203,061,220 205,064,058
Retirement of treasury stock (in shares)   (3,070,996)
Common, Balance as of end of period (in shares)   203,061,220
Common Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Retirement of treasury stock (in shares) (1,408,580)  
Common, Balance as of end of period (in shares) 201,974,411  
Common Stock | Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,068,158
Common Stock | Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 321,771  
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) (6,599,095) (6,460,055)
Shares repurchased (in shares)   (3,210,036)
Retirement of treasury stock (in shares)   3,070,996
Treasury, Balance as of end of period (in shares)   (6,599,095)
Treasury Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares repurchased (in shares) (1,355,371)  
Retirement of treasury stock (in shares) 1,408,580  
Treasury, Balance as of end of period (in shares) (6,463,983)  
Treasury Stock | Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 0  
Treasury Stock | Shares issued under ESPP | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares) 81,903