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Stock-Based Compensation - Long-Term Incentive Plan (Details) - NRG LTIP - shares	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under plan (in shares)	25,000,000	25,000,000
Number of shares available for grant under plan (in shares)	7,717,139	8,179,771

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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