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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Revenue	$ 6,348	$ 7,282	$ 14,070	$ 15,178
Related Party
Related Party Transaction [Line Items]
Revenue	22	10	58	26
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	0	0	1	1
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	21	9	55	22
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 1	$ 2	$ 3

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