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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
Oct. 31, 2024
Sep. 30, 2024
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) 264,056,285 267,330,470
Treasury, Balance as of beginning of period (in shares) (59,126,958) (59,199,520)
Common, Outstanding, as of beginning of period (in shares) 204,929,327 208,130,950
Shares repurchased (in shares)   (5,181,424)
Partial settlement of Capped Call Options (in shares)   (2,588)
Common, Balance as of end of period (in shares)   264,056,285
Treasury, Balance as of end of period (in shares)   (59,126,958)
Common, Outstanding, as of end of period (in shares)   204,929,327
Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares repurchased (in shares) (2,524,323)  
Common, Outstanding, as of end of period (in shares) 202,566,373  
Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,836,827
Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 64,861  
Shares issued under ESPP    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares)   145,562
Shares issued under ESPP | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares) 96,508  
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) 264,056,285 267,330,470
Partial settlement of Capped Call Options (in shares)   0
Retirement of treasury stock (in shares)   (5,111,012)
Common, Balance as of end of period (in shares)   264,056,285
Common Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Retirement of treasury stock (in shares) (2,064,950)  
Common, Balance as of end of period (in shares) 262,056,196  
Common Stock | Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,836,827
Common Stock | Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 64,861  
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) (59,126,958) (59,199,520)
Shares repurchased (in shares)   (5,181,424)
Partial settlement of Capped Call Options (in shares)   (2,588)
Retirement of treasury stock (in shares)   5,111,012
Treasury, Balance as of end of period (in shares)   (59,126,958)
Treasury Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares repurchased (in shares) (2,524,323)  
Retirement of treasury stock (in shares) 2,064,950  
Treasury, Balance as of end of period (in shares) (59,489,823)  
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    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares)   145,562
Treasury Stock | Shares issued under ESPP | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares) 96,508