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Fair Value of Financial Instruments - Derivative Fair Value Measurements Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Fair Value Disclosures [Abstract]
Total derivative assets valued with prices provided by models and other valuation techniques percentage	17.00%
Total derivative liabilities valued with prices provided by models and other valuation techniques, percentage	18.00%
Increase In credit reserve, primarily in cost of operations	$ 2

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- Definition

This element represents the portion of total fair value of all derivative assets, which are valued using various valuation techniques including internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics.

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No definition available.

+ Details

Name:	nrg_DerivativeAssetFairValueDeterminedUsingValuationTechniquesPercentage
Namespace Prefix:	nrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Derivative Liability, Fair Value Determined Using Valuation Techniques, Percentage

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No definition available.

+ Details

Name:	nrg_DerivativeLiabilityFairValueDeterminedUsingValuationTechniquesPercentage
Namespace Prefix:	nrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Increase In Credit Reserve, Increase In Cost Of Revenue

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No definition available.

+ Details

Name:	nrg_IncreaseInCreditReserveIncreaseInCostOfRevenue
Namespace Prefix:	nrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration