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v3.23.1

Nature of Business and Basis of Presentation - General (Details) counterparty in Millions | 3 Months Ended
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Mar. 31, 2023 counterparty GW
Business Acquisition [Line Items] |
Generation capacity (in GW) | GW | 16
Home |
Business Acquisition [Line Items] |
Customers | counterparty | 7.5

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- Definition Number of customers + References No definition available. + Details
Name: | nrg_NumberOfCustomers
Namespace Prefix: | nrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Power Generation Capacity, Gigawatts + References No definition available. + Details
Name: | nrg_PowerGenerationCapacityGigawatts
Namespace Prefix: | nrg_
Data Type: | dtr-types: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 No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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