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Regulatory Matters (Details) $ in Millions | Dec. 20, 2013 USD ($)
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GenOn |
Regulatory Assets [Line Items] |
Regulatory payments sought | $ 22

X
- Definition Regulatory payments sought + References No definition available. + Details
Name: | nrg_Regulatorypaymentssought
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=nrg_GenOnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |