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Fair Value of Financial Instruments - Derivative Fair Value Measurements Narrative (Details) $ in Millions | 12 Months Ended
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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. + References 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 + References 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 + References 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