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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Held-for-sale |  |
Goodwill and Other Intangibles |  |
Emission allowances held-for-sale | $ 4 | $ 8

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- Definition This element represents the emission allowances held-for-sale that are included in other noncurrent assets on the entity's balance sheet. + References No definition available. + Details
Name: | nrg_OtherAssetsNoncurrentEmissionAllowances
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |