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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
Mar. 09, 2023
Jul. 31, 2023
Jun. 30, 2023
Schedule of Stock by Class, Equity [Roll Forward]      
Common, Balance as of beginning of period (in shares)   424,675,214 423,897,001
Treasury, Balance as of end of period (in shares)   (194,249,455) (194,335,971)
Common, Outstanding, as of beginning of period (in shares)   230,425,759 229,561,030
Preferred, Balance as of end of period (in shares)     650,000
Common, Balance as of end of period (in shares)     424,675,214
Treasury, Balance as of end of period (in shares)     (194,249,455)
Preferred, Outstanding as of end of period (in shares)     650,000
Common, Outstanding, as of end of period (in shares)     230,425,759
Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   (1,322,141)  
Common, Outstanding, as of end of period (in shares)   229,117,430  
Shares issued under LTIPs      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)     778,213
Shares issued under LTIPs | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)   13,812  
Shares issued under ESPP      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)     86,516
Preferred Stock      
Schedule of Stock by Class, Equity [Roll Forward]      
Preferred, Balance as of end of period (in shares)     650,000
Preferred, Outstanding 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  
Preferred, Outstanding as of end of period (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]      
Common, Balance as of beginning of period (in shares)   424,675,214 423,897,001
Common, Balance as of end of period (in shares)     424,675,214
Common Stock | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   0  
Common, Balance as of end of period (in shares)   424,689,026  
Common Stock | Shares issued under LTIPs      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)     778,213
Common Stock | Shares issued under LTIPs | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)   13,812  
Common Stock | Shares issued under ESPP      
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 end of period (in shares)   (194,249,455) (194,335,971)
Treasury, Balance as of end of period (in shares)     (194,249,455)
Treasury Stock | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   (1,322,141)  
Treasury, Balance as of end of period (in shares)   (195,571,596)  
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      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)     86,516