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Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares
 1 Months Ended 12 Months Ended
Mar. 09, 2023
Feb. 01, 2025
Jan. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Stock by Class, Equity [Roll Forward]            
Preferred shares, issued balance beginning (in shares)   650,000 650,000 650,000    
Preferred shares, outstanding, beginning balance (in shares)   650,000 650,000 650,000    
Preferred shares, issued balance as of end of period (in shares)       650,000 650,000  
Preferred shares, outstanding , ending balance (in shares)       650,000 650,000  
Beginning balance, common shares issued (in shares)   205,064,058 205,064,058 267,330,470    
Beginning balance, treasury shares (in shares)   (6,460,055) (6,460,055) (59,199,520)    
Beginning balance, common shares outstanding (in shares)   198,604,003 198,604,003 208,130,950 229,561,030 243,753,899
Total number of shares purchased (in shares)       11,725,563 22,730,940 14,685,521
Partial settlement of Capped Call Options (in shares)       (2,588)    
Ending balance, common shares issued (in shares)       205,064,058 267,330,470  
Ending balance, treasury shares (in shares)       (6,460,055) (59,199,520)  
Ending balance, common shares outstanding (in shares)       198,604,003 208,130,950 229,561,030
Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Total number of shares purchased (in shares)   1,076,423 1,076,423      
Ending balance, common shares outstanding (in shares)   198,068,576        
Long-term Incentive Plan            
Schedule of Stock by Class, Equity [Roll Forward]            
Shares issued under LTIPs (in shares)       1,959,134 1,109,611 349,827
Long-term Incentive Plan | Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Shares issued under LTIPs (in shares)   540,996        
Employee Stock Purchase Plan            
Schedule of Stock by Class, Equity [Roll Forward]            
Beginning balance, common shares outstanding (in shares)       208,130,950    
Shares issued under ESPP (in shares)       242,070 191,249 142,825
Ending balance, common shares outstanding (in shares)         208,130,950  
Preferred Stock            
Schedule of Stock by Class, Equity [Roll Forward]            
Preferred shares, outstanding, beginning balance (in shares)   650,000 650,000      
Preferred shares, outstanding , ending balance (in shares)       650,000    
Preferred Stock | Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Preferred shares, issued balance as of end of period (in shares)   650,000        
Preferred shares, outstanding , ending balance (in shares)   650,000        
Preferred Stock | Series A Preferred Stock            
Schedule of Stock by Class, Equity [Roll Forward]            
Issuance of Series A Preferred Stock (in shares) 650,000       650,000  
Common Stock            
Schedule of Stock by Class, Equity [Roll Forward]            
Beginning balance, common shares issued (in shares)   205,064,058 205,064,058 267,330,470 423,897,001 423,547,174
Beginning balance, common shares outstanding (in shares)   198,604,003 198,604,003      
Retirement of treasury stock (in shares)       (64,225,546) (157,676,142)  
Ending balance, common shares issued (in shares)       205,064,058 267,330,470 423,897,001
Ending balance, common shares outstanding (in shares)       198,604,003    
Common Stock | Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Retirement of treasury stock (in shares)   (1,028,193)        
Ending balance, common shares issued (in shares)   204,576,861        
Common Stock | Long-term Incentive Plan            
Schedule of Stock by Class, Equity [Roll Forward]            
Shares issued under LTIPs (in shares)       1,959,134 1,109,611 349,827
Common Stock | Long-term Incentive Plan | Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Shares issued under LTIPs (in shares)   540,996        
Treasury Stock            
Schedule of Stock by Class, Equity [Roll Forward]            
Beginning balance, treasury shares (in shares)   (6,460,055) (6,460,055) (59,199,520) (194,335,971) (179,793,275)
Shares issued under ESPP (in shares)       242,070 191,249 142,825
Total number of shares purchased (in shares)       11,725,563 22,730,940 14,685,521
Partial settlement of Capped Call Options (in shares)       (2,588)    
Retirement of treasury stock (in shares)       64,225,546 157,676,142  
Ending balance, treasury shares (in shares)       (6,460,055) (59,199,520) (194,335,971)
Treasury Stock | Subsequent Event            
Schedule of Stock by Class, Equity [Roll Forward]            
Total number of shares purchased (in shares)   1,076,423        
Retirement of treasury stock (in shares)   1,028,193        
Ending balance, treasury shares (in shares)   (6,508,285)