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Benefit Plans and Other Postretirement Benefits - Expected Future Benefit Payments for the Next Five Years and Other (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Company's contributions to 401(k) plans |  |  |
Company contributions to defined contribution plans | $ 62 | $ 61 | $ 37
Benefit Payments |  |  |
NRG's expected future benefit payments |  |  |
2025 | 93 |  |
2026 | 77 |  |
2027 | 75 |  |
2028 | 73 |  |
2029 | 71 |  |
2030-2034 | 336 |  |
Other Postretirement Benefits Plan |  |  |
NRG's expected future benefit payments |  |  |
2025 | 5 |  |
2026 | 5 |  |
2027 | 5 |  |
2028 | 5 |  |
2029 | 5 |  |
2030-2034 | 28 |  |
Medicare prescription drug reimbursements |  |  |
2025 | 0 |  |
2026 | 0 |  |
2027 | 0 |  |
2028 | 0 |  |
2029 | 0 |  |
2030-2034 | $ 2 |  |

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