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Nuclear Innovation North America LLC Developments	9 Months Ended
Nuclear Innovation North America LLC Developments	Sep. 30, 2012
Nuclear Decommissioning Trust Fund [Abstract]
Nuclear Innovation North America LLC Developments, Including Impairment Charge	Nuclear Innovation North America LLC, or NINA, Impairment Charge As discussed in detail in Note 4, Nuclear Innovation North America LLC Developments, Including Impairment Charge, to the Company's 2011 Form 10-K, NRG deconsolidated NINA as of March 31, 2011, and recorded an impairment charge of $495 million for the nine months ended September 30, 2011, including $481 million in the quarter ended March 31, 2011 for the full amount of its investment, $11 million in the quarter ended June 30, 2011 and $3 million for the quarter ended September 30, 2011.