XML 122 R95.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Accounting for Derivative Instruments and Hedging Activities - Net Notional Volume Buy/Sell of Open Derivative Transactions (Details) certificate in Millions, bbl in Millions, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) MWh MMBTU certificate T bbl | Dec. 31, 2022 USD ($) MWh MMBTU certificate T bbl
Long | Emissions |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 0 | 1
Long | Renewables Energy Certificates |  |
Derivative [Line Items] |  |
Derivative, non-monetary notional amount (in shares) | certificate | 12 | 15
Long | Coal |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 9 | 11
Long | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, volume (in barrels) | bbl | 0 | 1
Long | Power |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh | 201 | 192
Long | Interest |  |
Derivative [Line Items] |  |
Derivative, notional amount (usd) | $ | $ 1,000 | $ 0
Long | Foreign Exchange |  |
Derivative [Line Items] |  |
Derivative, notional amount (usd) | $ | $ 548 | $ 569
Short | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MMBTU | 838 | 422
Short | Consumer Financing Program |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh | 1,116 | 0

X
- Definition Derivative, Non-monetary Notional Amount, Other + References No definition available. + Details
Name: | nrg_DerivativeNonmonetaryNotionalAmountOther
Namespace Prefix: | nrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountMass
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_EmissionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_RenewableEnergyCertificatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_CoalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_OilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_PowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_InterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_ForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_NaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=nrg_ConsumerFinancingProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |