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Regulatory Matters	12 Months Ended
Regulatory Matters	Dec. 31, 2020
Regulatory Matters Disclosure [Abstract]
Regulatory Matters	Regulatory Matters NRG operates in a highly regulated industry and is subject to regulation by various federal and state agencies. As such, NRG is affected by regulatory developments at both the federal and state levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG's wholesale and retail operations. In addition to the regulatory proceedings noted below, NRG and its subsidiaries are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows. California Station Power — As the result of unfavorable final and non-appealable litigation, the Company accrued a liability associated with consumption of station power at the Company's Encina power plant facility in California after August 30, 2010. The Company has established an appropriate accrual pending potential regulatory action by SDG&E regarding the Company's Encina facility. South Central — On August 4, 2016, NRG received a document hold notice from FERC regarding conduct in the MISO and PJM markets. FERC Office of Enforcement Staff investigated potential violations of MISO rules involving bidding for the Big Cajun 2 facility, as well as other aspects of NRG’s operations in MISO. On August 18, 2020, FERC Office of Enforcement presented NRG with its preliminary findings. NRG responded to the preliminary findings on January 15, 2021. FERC has the authority to require disgorgement of profits and to impose penalties and NRG retains any liability following the sale of the South Central Portfolio. ISO-NE — On January 8, 2021, the Commission approved a settlement agreement the Company entered into to resolve FERC Enforcement Staff's investigation of offers submitted during the qualification period for the ISO-NE Forward Capacity Auction in 2016. The settlement was approved in a 2-1 vote. The Commission Chairman dissented on the basis that the investigation should have been terminated because the Company should not be penalized for reflecting a different expectation from that of the ISO-NE Internal Market Monitor in its forecast of future events submitted for independent review in the tariff-prescribed bid review process. Under the settlement, the Company agreed to pay a civil penalty of $85 thousand and is subject to compliance monitoring.