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Fair Value of Financial Instruments - Counterparty Credit Risk (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($) counterparty
Concentration of Credit Risk |
Counterparty credit exposure to a portion of the Company's counterparties | $ 232
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties | 19
Net counterparty credit exposure to a portion of the Company's counterparties | $ 214
Company's exposure before collateral is expected to roll off by the end of 2019 (as a percent) | 39.00%
Net exposure (as a percent) | 100.00%
Counterparty credit risk exposure | $ 45
Wholesale counterparty with net exposure | counterparty | 2
Counterparty credit risk exposure to certain counterparties, threshold (as a percent) | 10.00%
Estimated counterparty credit risk exposure to certain counterparties | $ 621
Period of estimated counterparty credit risk exposure, years | 5 years
Investment grade |
Concentration of Credit Risk |
Net exposure (as a percent) | 59.00%
Non-investment grade/non-rated |
Concentration of Credit Risk |
Net exposure (as a percent) | 41.00%
Utilities, energy merchants, marketers and other |
Concentration of Credit Risk |
Net exposure (as a percent) | 88.00%
Financial institutions |
Concentration of Credit Risk |
Net exposure (as a percent) | 12.00%

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- Definition Carrying amount as of the balance sheet date of cash collateral and letters of credit received by the entity on deposit from third parties in support of energy risk management. + References No definition available. + Details
Name: | nrg_CollateralHeldCashAndLettersOfCredit
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage of net counterparty credit exposure that rolls-off by the end of 2012. + References No definition available. + Details
Name: | nrg_CounterpartyCreditRiskExposurePercentageOfCreditRiskRollOff
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the threshold percentage for disclosure of counterparty credit exposure. + References No definition available. + Details
Name: | nrg_CounterpartyCreditRiskExposurePercentageThreshold
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of net counterparty credit exposure of the entity. + References No definition available. + Details
Name: | nrg_CreditDerivativeMaximumNetExposurePercentage
Namespace Prefix: | nrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the estimated amount of the counterparty credit risk exposure. + References No definition available. + Details
Name: | nrg_EstimatedCounterpartyCreditRiskExposureToCertainCounterparties
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period + References No definition available. + Details
Name: | nrg_EstimatedCounterpartyCreditRiskExposureToCertainCounterpartiesPeriod
Namespace Prefix: | nrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Net Counterparty Credit Risk Exposure to Certain Counterparties, Amount + References No definition available. + Details
Name: | nrg_NetCounterpartyCreditRiskExposureToCertainCounterpartiesAmount
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the net exposure of the entity determined as total credit exposure to all counterparties less collateral (cash and letters of credit) held against those positions as of the reporting date. + References No definition available. + Details
Name: | nrg_NetCreditExposure
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number Of Wholesale Counterparties With Credit Risk Exposure + References No definition available. + Details
Name: | nrg_NumberOfWholesaleCounterpartiesWithCreditRiskExposure
Namespace Prefix: | nrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 + Details
Name: | us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 No definition available. + Details
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- Details
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Period Type: |

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- Details
Name: | nrg_CounterpartyRiskByInvestmentGradeAxis=nrg_ExternalCreditRatingNotRatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | nrg_CounterpartyRiskByInstitutionAxis=nrg_UtilitiesEnergyMerchantsMarketersAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | nrg_CounterpartyRiskByInstitutionAxis=nrg_FinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |