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Guarantees - Schedule of Maximum Potential Exposure (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Guarantor Obligations |  |
Under 1 Year | $ 4,333 |
1-3 Years | 56 |
3-5 Years | 24 |
Over 5 Years | 189 |
Guarantees by Remaining Maturity, Total | 4,602 | $ 1,746
Letters of credit and surety bonds |  |
Guarantor Obligations |  |
Under 1 Year | 4,064 |
1-3 Years | 31 |
3-5 Years | 0 |
Over 5 Years | 0 |
Guarantees by Remaining Maturity, Total | 4,095 | 1,153
Asset sales guarantee obligations |  |
Guarantor Obligations |  |
Under 1 Year | 269 |
1-3 Years | 25 |
3-5 Years | 24 |
Over 5 Years | 96 |
Guarantees by Remaining Maturity, Total | 414 | 506
Other guarantees |  |
Guarantor Obligations |  |
Under 1 Year | 0 |
1-3 Years | 0 |
3-5 Years | 0 |
Over 5 Years | 93 |
Guarantees by Remaining Maturity, Total | $ 93 | $ 87

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
Balance Type: | credit
Period Type: | instant

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: |
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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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