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Changes in Capital Structure - Changes in NRG's common stock issued and outstanding (Details)
 6 Months Ended
Jun. 30, 2020
shares
Schedule of Stock by Class, Equity [Roll Forward]  
Balance as of beginning of period (in shares) 421,890,790
Treasury shares, balance as of beginning of period (in shares) (172,894,601)
Outstanding, as of beginning of period (in shares) 248,996,189
Shares issued under LTIPs (in shares) 1,140,987
Stock issued under ESPP (in shares) 63,455
Shares repurchased (in shares) (6,062,783)
Balance as of end of period (in shares) 423,031,777
Treasury shares, balance as of end of the period (in shares) (178,893,929)
Outstanding, as of end of period (in shares) 244,137,848
Common Stock  
Schedule of Stock by Class, Equity [Roll Forward]  
Balance as of beginning of period (in shares) 421,890,790
Shares issued under LTIPs (in shares) 1,140,987
Stock issued under ESPP (in shares) 0
Shares repurchased (in shares) 0
Balance as of end of period (in shares) 423,031,777
Treasury  
Schedule of Stock by Class, Equity [Roll Forward]  
Treasury shares, balance as of beginning of period (in shares) (172,894,601)
Shares issued under LTIPs (in shares) 0
Stock issued under ESPP (in shares) 63,455
Shares repurchased (in shares) (6,062,783)
Treasury shares, balance as of end of the period (in shares) (178,893,929)