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v3.20.4

Guarantees - Schedule of Maximum Potential Exposure (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Guarantor Obligations |  |
Under 1 Year | $ 1,135 |
1-3 Years | 355 |
3-5 Years | 57 |
Over 5 Years | 199 |
Guarantees by Remaining Maturity, Total | 1,746 | $ 2,010
Letters of credit and surety bonds |  |
Guarantor Obligations |  |
Under 1 Year | 1,049 |
1-3 Years | 73 |
3-5 Years | 31 |
Over 5 Years | 0 |
Guarantees by Remaining Maturity, Total | 1,153 | 1,024
Asset sales guarantee obligations |  |
Guarantor Obligations |  |
Under 1 Year | 86 |
1-3 Years | 282 |
3-5 Years | 26 |
Over 5 Years | 112 |
Guarantees by Remaining Maturity, Total | 506 | 698
Other guarantees |  |
Guarantor Obligations |  |
Under 1 Year | 0 |
1-3 Years | 0 |
3-5 Years | 0 |
Over 5 Years | 87 |
Guarantees by Remaining Maturity, Total | $ 87 | $ 288

X
- Definition Maximum potential amount of future payments that the guarantor could be required to make between one to three years of the balance sheet date under the guarantee. + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments that the guarantor could be required to make between three to five years of the balance sheet date under the guarantee. + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Maximum potential amount of future payments that the guarantor could be required to make after five years of the balance sheet date under the guarantee. + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Maximum potential amount of future payments that the guarantor could be required to make within one year of the balance sheet date under the guarantee. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition The estimated amount of future payments the guarantor could be required to make under guarantees, indemnities and other contingent liability obligations. + References No definition available. + Details
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Namespace Prefix: | nrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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X
- Details
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Namespace Prefix: |
Data Type: | na
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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