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Accounting for Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Net Notional Volume Buy/(Sell) of NRG's Open Derivative Transactions Broken Out by Commodity
The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity, excluding those derivatives that qualified for the NPNS exception as of December 31, 2025 and 2024. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.
 Total Volume (In millions)
CategoryUnitsDecember 31, 2025December 31, 2024
EmissionsShort Ton2 1 
Renewables Energy CertificatesCertificates13 13 
CoalShort Ton8 10 
Natural GasMMBtu907 861 
PowerMWh103 91 
InterestDollars700 700 
Foreign ExchangeDollars437 410 
Consumer Financing ProgramDollars1,354 1,219 
Fair Value Within the Derivative Instrument Valuation on the Balance Sheet
The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
 Fair Value
 Derivative AssetsDerivative Liabilities
(In millions)December 31, 2025December 31, 2024December 31, 2025December 31, 2024
Derivatives Not Designated as Cash Flow or Fair Value Hedges:
    
Interest rate contracts - current$— $— $4 $3 
Interest rate contracts - long-term— 9 — — 
Foreign exchange contracts - current2 15 1 — 
Foreign exchange contracts - long-term1 7 2 1 
Commodity contracts - current1,991 2,295 1,997 2,067 
Commodity contracts - long-term1,141 1,073 935 903 
Consumer Financing Program - current— — 184 137 
Consumer Financing Program - long-term— — 99 66 
Derivatives Not Designated as Cash Flow or Fair Value Hedges
$3,135 $3,399 $3,222 $3,177 
Deferred gains/losses on NPNS contracts - current196 376 71 90 
Deferred gains/losses on NPNS contracts - long-term426 621 67 137 
Deferred gains/losses on NPNS contracts(a)
$622 $997 $138 $227 
Total Derivatives Not Designated as Cash Flow or Fair Value Hedges
$3,757 $4,396 $3,360 $3,404 
(a)Balances related to certain derivative contracts that were previously accounted for as derivative contracts following the election of the NPNS exemption and the discontinuance of derivative accounting treatment as of the election date
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid The following table summarizes the offsetting derivatives by counterparty master agreement level and collateral received or paid:
Gross Amounts Not Offset in the Statement of Financial Position
(In millions)Gross Amounts of Recognized Assets/LiabilitiesDerivative InstrumentsCash Collateral (Held)/PostedNet Amount
As of December 31, 2025
Interest rate contracts:
Derivative liabilities$(4)$— $— $(4)
Foreign exchange contracts:
Derivative assets$3 $(2)$— $1 
Derivative liabilities(3)2 — (1)
Total foreign exchange contracts$— $— $— $— 
Commodity contracts:
Derivative assets$3,754 $(2,724)$(215)$815 
Derivative liabilities(3,070)2,724 137 (209)
Total commodity contracts$684 $— $(78)$606 
Consumer Financing Program:
Derivative liabilities$(283)$— $— $(283)
Total derivative instruments$397 $— $(78)$319 
Gross Amounts Not Offset in the Statement of Financial Position
(In millions)Gross Amounts of Recognized Assets/LiabilitiesDerivative InstrumentsCash Collateral (Held)/PostedNet Amount
As of December 31, 2024
Interest rate contracts:
Derivative assets$9 $(3)$— $6 
Derivative liabilities(3)3 — — 
Total interest rate contracts6 — — 6 
Foreign exchange contracts:
Derivative assets$22 $(1)$— $21 
Derivative liabilities(1)1 — — 
Total foreign exchange contracts$21 $— $— $21 
Commodity contracts:
Derivative assets$4,365 $(2,992)$(168)$1,205 
Derivative liabilities(3,197)2,992 61 (144)
Total commodity contracts$1,168 $— $(107)$1,061 
Consumer Financing Program:
Derivative liabilities$(203)$— $— $(203)
Total derivative instruments$992 $— $(107)$885 
Pre-tax Effects of Economic Hedges That Have Not Been Designated as Cash Flow Hedges, Ineffectiveness on Cash Flow Hedges and Trading Activity on the Company's Statement of Operations
The following tables summarize the pre-tax effects of economic hedges that have not been designated as cash flow hedges or fair value hedges and trading activity on the Company's statement of operations. The effect of foreign exchange and commodity hedges is included within revenues and cost of operations. The effect of the interest rate contracts is included within interest expense. The effect of the Consumer Financing Program is included in other income, net.
 Year Ended December 31,
(In millions)202520242023
Unrealized mark-to-market results  
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges(a)
$(432)$106 $(1,734)
Reversal of acquired loss positions related to economic hedges
47 5 20 
Net unrealized gains/(losses) on open positions related to economic hedges
39 95 (1,149)
Total unrealized mark-to-market (losses)/gains for economic hedging activities
(346)206 (2,863)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity
2 (1)13 
Net unrealized gains on open positions related to trading activity
3 2 25 
Total unrealized mark-to-market gains for trading activity5 1 38 
Total unrealized (losses)/gains - commodities and foreign exchange$(341)$207 $(2,825)
(a) For the years ended December 31, 2025 and 2024, includes $(286) million and $37 million, respectively, related to derivative contracts that were elected as NPNS on October 1, 2024 and are no longer valued at fair value on a recurring basis
 Year Ended December 31,
(In millions)202520242023
Total impact to statement of operations - interest rate contracts$(10)$3 $4 
Unrealized gains/(losses) included in revenues - commodities
$17 $(2)$182 
Unrealized (losses)/gains included in cost of operations - commodities(338)186 (2,988)
Unrealized (losses)/gains included in cost of operations - foreign exchange(20)23 (19)
Total impact to statement of operations - commodities and foreign exchange
$(341)$207 $(2,825)
Total impact to statement of operations - Consumer Financing Program
$(21)$(14)$(16)