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Related Party Transactions - Schedule of NRG's Material Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Related Party Transaction [Line Items]
Revenue	$ 6,740	$ 6,659	$ 15,325	$ 14,088
Related Party
Related Party Transaction [Line Items]
Revenue	13	13	27	28
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	0	0	1	1
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	12	12	24	25
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 1	$ 2	$ 2

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