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Nuclear Decommissioning Trust Fund | 12 Months Ended
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Dec. 31, 2023
Regulated Operations [Abstract] |
Nuclear Decommissioning Trust Fund | Nuclear Decommissioning Trust Fund Through the sale of the Company's 44% equity interest in STP on November 1, 2023, NRG's Nuclear Decommissioning Trust Fund assets, which were for the decommissioning of STP, were comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounted for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations, or ASC 980, because the Company's nuclear decommissioning activities were subject to approval by the PUCT, with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company was in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning was the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund were recorded to the Nuclear Decommissioning Trust liability and were not included in net income or accumulated other comprehensive income, consistent with regulatory treatment. Following the sale of the Company's 44% equity interest in STP on November 1, 2023, the Company is no longer responsible for the decommissioning of STP and no longer holds the Nuclear Decommissioning Trust Fund assets. For further discussion of the sale, see Note 4, Acquisitions and Dispositions. The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds as of December 31, 2022, as well as information about the contractual maturities of those securities as of that date.
|  |  | As of December 31, 2022
(In millions, except otherwise noted) |  |  |  |  |  |  |  |  | Fair Value |  | Unrealized Gains |  | Unrealized Losses |  | Weighted- average maturities (in years)
Cash and cash equivalents |  |  |  |  |  |  |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | — |
U.S. government and federal agency obligations |  |  |  |  |  |  |  |  | 86 |  |  | — |  |  | 5 |  |  | 11
Federal agency mortgage-backed securities |  |  |  |  |  |  |  |  | 101 |  |  | — |  |  | 11 |  |  | 26
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  | 35 |  |  | — |  |  | 4 |  |  | 30
Corporate debt securities |  |  |  |  |  |  |  |  | 114 |  |  | — |  |  | 13 |  |  | 12
Equity securities |  |  |  |  |  |  |  |  | 486 |  |  | 346 |  |  | 3 |  |  | — |
Foreign government fixed income securities |  |  |  |  |  |  |  |  | 1 |  |  | — |  |  | — |  |  | 17
Total |  |  |  |  |  |  |  |  | $ | 838 |  |  | $ | 346 |  |  | $ | 36 |  |  |
The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales for the ten months ended October 31, 2023, and for the years ended December 31, 2022 and 2021. The cost of securities sold was determined using the specific identification method.
(In millions) | 2023 |  | 2022 |  | 2021
Realized gains | $ | 11 |  |  | $ | 14 |  |  | $ | 47 |
Realized losses | (19) |  |  | (25) |  |  | (9) |
Proceeds from sale of securities | 355 |  |  | 448 |  |  | 710 |

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- Definition This item represents the disclosure regarding the nuclear decommissioning trust fund assets investments held in trust to pay for the cost of decommissioning a facility at the end of its economic life as a single block text. The disclosure may include the following: the aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held as well as information about the contractual maturities of those securities; summarized proceeds from sales of available for sale securities and the related realized gains and losses from these sales. The disclosure also includes that such funds are contributed and owned by the ratepayers but reported by the entity. + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration