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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Revenue	$ 7,946	$ 8,510	$ 22,016	$ 23,688
Related Party
Related Party Transaction [Line Items]
Revenue	16	13	74	39
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	1	1	2	2
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	15	10	70	32
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 0	$ 2	$ 2	$ 5

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