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Related Party Transactions - Schedule of NRG's Material Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Revenue	$ 7,223	$ 7,946	$ 21,311	$ 22,016
Related Party
Related Party Transaction [Line Items]
Revenue	14	16	42	74
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	1	1	2	2
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	12	15	37	70
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 0	$ 3	$ 2

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