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Nature of Business (Details) customer in Millions | 12 Months Ended
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Dec. 31, 2024 customer GW
Business Acquisition [Line Items] |
Generation capacity (in MW) | GW | 13
Residential Customer |
Business Acquisition [Line Items] |
Customers served | 8
Retail Energy Customer |
Business Acquisition [Line Items] |
Customers served | 6
Home |
Business Acquisition [Line Items] |
Customers served | 2

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- Definition Number of Customers + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition The generation capacity of the entity's power generation facilities as of the balance sheet date, expressed in megawatts. + References No definition available. + Details
Name: | nrg_PowerGenerationCapacityMegawatts
Namespace Prefix: | nrg_
Data Type: | dtr-types1:powerItemType
Balance Type: | na
Period Type: | instant

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=nrg_HomeCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |