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Related Party Transactions - Schedule of NRG's Material Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Revenue	$ 8,585	$ 7,429
Related Party
Related Party Transaction [Line Items]
Revenue	14	15
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	1	1
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	12	13
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 1

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