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Earnings Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic income per share:            
Net income attributable to NRG Energy, Inc. $ 313 $ 121 $ 201 $ 482 $ 434 $ 683
Weighted average number of common shares outstanding — basic (in shares) 245   265   246 272
Income/(loss) per weighted average common share — basic (in usd per share) $ 1.28   $ 0.76   $ 1.76 $ 2.51
Diluted income per share:            
Net income available to common shareholders $ 313   $ 201   $ 434 $ 683
Weighted average number of common shares outstanding - diluted (in shares) 245   265   246 272
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares) 1   2   1 2
Weighted average number of common shares outstanding- dilutive (in shares) 246   267   247 274
Income/(loss) per weighted average common share — diluted (in usd per share) $ 1.27   $ 0.75   $ 1.76 $ 2.49