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Unaudited Quarterly Financial Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Financial Data Disclosure [Abstract]                      
Operating revenues $ 2,132 $ 2,674 $ 2,278 $ 1,995 $ 1,816 $ 2,685 $ 2,133 $ 2,215 $ 9,079 $ 8,849 $ 8,952
Operating income 9 43 269 314 152 454 444 258 635 1,308 2,159
Net income/(loss) attributable to NRG Energy, Inc. $ (109) $ (55) $ 621 $ (260) $ (15) $ 223 $ 211 $ 58 $ 197 $ 477 $ 942
Weighted average number of common shares outstanding - basic (in shares) 229 240 243 247 248 252 255 254 240 252 246
Net Income per Weighted Average Common Share - Basic (in dollars per share) $ (0.48) $ (0.24) $ 2.54 $ (1.06) $ (0.07) $ 0.88 $ 0.82 $ 0.22 $ 0.78 $ 1.86 $ 3.70
Weighted average number of common shares outstanding - diluted (in shares) 229 240 244 247 248 253 256 257 241 254 271
Net Income Per Weighted Average Common Share - Diluted (in dollars per share) $ (0.48) $ (0.24) $ 2.53 $ (1.06) $ (0.07) $ 0.87 $ 0.81 $ 0.22 $ 0.78 $ 1.84 $ 3.44