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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Revenue	$ 7,635	$ 7,223	$ 22,960	$ 21,311
Related Party
Related Party Transaction [Line Items]
Revenue	17	14	44	42
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	1	1	2	2
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	14	12	38	37
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 2	$ 1	$ 4	$ 3

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