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Accounting for Derivative Instruments and Hedging Activities (Tables)
9 Months Ended
Sep. 30, 2021
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 category, excluding those derivatives that qualified for the NPNS exception, as of September 30, 2021 and December 31, 2020. 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)
CategoryUnitsSeptember 30, 2021December 31, 2020
EmissionsShort Ton
Renewable Energy CertificatesCertificates13 
CoalShort Ton
Natural GasMMBtu663 (286)
OilBarrels— 
PowerMWh185 57 
CapacityMW/Day— (1)
Foreign ExchangeDollars$218 $— 
Fair value within the derivative instrument valuation on the balance sheets
The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:
 Fair Value
 Derivative AssetsDerivative Liabilities
(In millions)September 30, 2021December 31, 2020September 30, 2021December 31, 2020
Derivatives Not Designated as Cash Flow or Fair Value Hedges:   
Foreign exchange contracts - current$$— $— $— 
Commodity contracts - current8,527 560 6,032 499 
Commodity contracts - long-term2,671 261 1,489 385 
Total Derivatives Not Designated as Cash Flow or Fair Value Hedges$11,199 $821 $7,521 $884 
Offsetting of derivatives by counterparty assets The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:
Gross Amounts Not Offset in the Statement of Financial Position
(In millions)Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
As of September 30, 2021
Foreign exchange contracts:
Derivative assets$$— $— $
Total foreign exchange contracts$$— $— $
Commodity contracts:
Derivative assets$11,198 $(6,946)$(1,712)$2,540 
Derivative liabilities(7,521)6,946 — (575)
Total commodity contracts$3,677 $— $(1,712)$1,965 
Total derivative instruments$3,678 $— $(1,712)$1,966 
Gross Amounts Not Offset in the Statement of Financial Position
(In millions)Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
As of December 31, 2020
Commodity contracts:
Derivative assets$821 $(658)$(5)$158 
Derivative liabilities(884)658 — (226)
Total commodity contracts$(63)$— $(5)$(68)
Offsetting of derivatives by counterparty, liabilities The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:
Gross Amounts Not Offset in the Statement of Financial Position
(In millions)Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
As of September 30, 2021
Foreign exchange contracts:
Derivative assets$$— $— $
Total foreign exchange contracts$$— $— $
Commodity contracts:
Derivative assets$11,198 $(6,946)$(1,712)$2,540 
Derivative liabilities(7,521)6,946 — (575)
Total commodity contracts$3,677 $— $(1,712)$1,965 
Total derivative instruments$3,678 $— $(1,712)$1,966 
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, 2020
Commodity contracts:
Derivative assets$821 $(658)$(5)$158 
Derivative liabilities(884)658 — (226)
Total commodity contracts$(63)$— $(5)$(68)
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 table summarizes 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 are included within operating revenues and cost of operations.
(In millions)Three months ended September 30,Nine months ended September 30,
Unrealized mark-to-market results2021202020212020
Reversal of previously recognized unrealized (gains) on settled positions related to economic hedges
$(97)$(101)$(58)$(62)
Reversal of acquired (gain)/loss positions related to economic hedges
(42)(2)206 
Net unrealized gains/(losses) on open positions related to economic hedges
1,924 (15)3,875 73 
Total unrealized mark-to-market gains/(losses) for economic hedging activities
1,785 (118)4,023 13 
Reversal of previously recognized unrealized (gains) on settled positions related to trading activity
(6)(7)(16)(14)
Net unrealized gains on open positions related to trading activity
14 18 19 
Total unrealized mark-to-market gains/(losses) for trading activity
(5)
Total unrealized gains/(losses)$1,793 $(123)$4,025 $18 

Three months ended September 30,Nine months ended September 30,
(In millions)2021202020212020
Unrealized gains/(losses) included in operating revenues - commodities$11 $34 $(97)$83 
Unrealized gains/(losses) included in cost of operations - commodities1,777 (157)4,121 (65)
Unrealized gains included in cost of operations - foreign exchange— — 
Total impact to statement of operations $1,793 $(123)$4,025 $18