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v3.20.2

Long-term Debt - Non Recourse Debt (Details) - Letter of Credit - USD ($) |  | 2 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jan. 04, 2019 | Sep. 30, 2020 | Nov. 05, 2020
Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Increase credit facility |  |  | $ 87,000,000
Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement | $ 80,000,000 |  |
Facility fees | 1.33% |  |
Increase credit facility |  | $ 50,000,000 |
Letters of credit issued |  | $ 80,000,000 |
Credit Agreement | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement |  |  | $ 167,000,000

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Increase + References No definition available. + Details
Name: | nrg_LineOfCreditFacilityMaximumBorrowingCapacityIncrease
Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=nrg_CreditAgreement2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |