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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, 2024
Mar. 31, 2024
Schedule of Stock by Class, Equity [Roll Forward]    
Preferred, Balance as of beginning of period (in shares) 650,000  
Preferred, Balance as of end of period (in shares)   650,000
Common, Balance as of beginning of period (in shares) 267,365,782 267,330,470
Treasury, Balance as of beginning of period (in shares) (59,199,520) (59,199,520)
Common, Outstanding, as of beginning of period (in shares) 208,166,262 208,130,950
Shares repurchased (in shares)   (1,163,230)
Retirement of treasury stock (in shares)   1,163,230
Common, Balance as of end of period (in shares)   267,365,782
Treasury, Balance as of end of period (in shares)   (59,199,520)
Common, Outstanding, as of end of period (in shares)   208,166,262
Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Common, Outstanding, as of end of period (in shares) 208,475,647  
Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,198,542
Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 163,823  
Shares issued under ESPP | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under ESPP (in shares) 145,562  
Preferred Stock    
Schedule of Stock by Class, Equity [Roll Forward]    
Preferred, Balance as of beginning of period (in shares) 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) 267,365,782 267,330,470
Shares repurchased (in shares)   0
Retirement of treasury stock (in shares)   (1,163,230)
Common, Balance as of end of period (in shares)   267,365,782
Common Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Common, Balance as of end of period (in shares) 267,529,605  
Common Stock | Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   1,198,542
Common Stock | Shares issued under LTIPs | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares) 163,823  
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) (59,199,520) (59,199,520)
Shares repurchased (in shares)   (1,163,230)
Retirement of treasury stock (in shares)   1,163,230
Treasury, Balance as of end of period (in shares)   (59,199,520)
Treasury Stock | Subsequent Event    
Schedule of Stock by Class, Equity [Roll Forward]    
Treasury, Balance as of end of period (in shares) (59,053,958)  
Treasury Stock | Shares issued under LTIPs    
Schedule of Stock by Class, Equity [Roll Forward]    
Shares issued under LTIPs (in shares)   0
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) 145,562