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Regulatory Matters (Details) $ in Millions	Dec. 20, 2013 USD ($)
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: