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Accounting for Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and December 31, 2018. 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
September 30, 2019December 31, 2018
CategoryUnits(In millions)
EmissionsShort Ton2  (2) 
Renewable Energy CertificatesCertificates1  1  
CoalShort Ton4  13  
Natural GasMMBtu(273) (330) 
OilBarrels—  1  
PowerMWh37  1  
CapacityMW/Day(1) (1) 
InterestDollars$—  $1,000  
Fair value within the derivative instrument valuation on the balance sheets
The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:
 Fair Value
 Derivative AssetsDerivative Liabilities
September 30, 2019December 31, 2018September 30, 2019December 31, 2018
(In millions)
Derivatives Not Designated as Cash Flow or Fair Value Hedges:   
Interest rate contracts current$—  $17  $—  $—  
Interest rate contracts long-term—  22  —  —  
Commodity contracts current735  747  668  673  
Commodity contracts long-term358  295  364  304  
Total Derivatives Not Designated as Cash Flow or Fair Value Hedges$1,093  $1,081  $1,032  $977  
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 September 30, 2019 Balance Sheet
Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
(In millions)
Commodity contracts:
Derivative assets$1,093  $(869) $(5) $219  
Derivative liabilities(1,032) 869  70  (93) 
Total commodity contracts$61  $—  $65  $126  

Gross Amounts Not Offset in the December 31, 2018 Balance Sheet
Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
(In millions)
Commodity contracts:
Derivative assets$1,042  $(778) $(31) $233  
Derivative liabilities(977) 778  114  (85) 
Total commodity contracts65  —  83  148  
Interest rate contracts:
Derivative assets39  —  —  39  
Total interest rate contracts39  —  —  39  
Total derivative instruments$104  $—  $83  $187  
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 September 30, 2019 Balance Sheet
Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
(In millions)
Commodity contracts:
Derivative assets$1,093  $(869) $(5) $219  
Derivative liabilities(1,032) 869  70  (93) 
Total commodity contracts$61  $—  $65  $126  

Gross Amounts Not Offset in the December 31, 2018 Balance Sheet
Gross Amounts of Recognized Assets / LiabilitiesDerivative InstrumentsCash Collateral (Held) / PostedNet Amount
(In millions)
Commodity contracts:
Derivative assets$1,042  $(778) $(31) $233  
Derivative liabilities(977) 778  114  (85) 
Total commodity contracts65  —  83  148  
Interest rate contracts:
Derivative assets39  —  —  39  
Total interest rate contracts39  —  —  39  
Total derivative instruments$104  $—  $83  $187  
Effects of Accumulated OCL balance attributable to cash flow hedge derivatives, net of tax
The following table summarizes the effects on the Company's accumulated OCL balance attributable to cash flow hedge derivatives, net of tax:
Interest Rate Contracts
Three months endedNine months ended
September 30, 2018September 30, 2018
(In millions) 
Accumulated OCL beginning balance$(23) $(54) 
Reclassified from accumulated OCL to income:
Due to realization of previously deferred amounts
1  8  
Mark-to-market of cash flow hedge accounting contracts
(3) 21  
Sale of NRG Yield and Renewables Platform25  25  
Accumulated OCL ending balance, net of $0 tax
$—  $—  
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 and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.
Three months ended September 30,Nine months ended September 30,
2019201820192018
Unrealized mark-to-market results(In millions) 
Reversal of previously recognized unrealized (gains) on settled positions related to economic hedges
$(118) $(84) $(88) $(85) 
Reversal of acquired (gain) positions related to economic hedges
(3) (10) (4) (11) 
Net unrealized gains on open positions related to economic hedges
57  26  69  158  
Total unrealized mark-to-market (losses)/gains for economic hedging activities
(64) (68) (23) 62  
Reversal of previously recognized unrealized (gains) on settled positions related to trading activity
(1) (4) (8) (10) 
Net unrealized (losses)/gains on open positions related to trading activity
(3) 8  23  27  
Total unrealized mark-to-market (losses)/gains for trading activity
(4) 4  15  17  
Total unrealized (losses)/gains$(68) $(64) $(8) $79  

Three months ended September 30,Nine months ended September 30,
2019201820192018
(In millions) 
Unrealized (losses)/ gains included in operating revenues$(214) $59  $66  $(14) 
Unrealized gains/(losses) included in cost of operations146  (123) (74) 93  
Total impact to statement of operations — energy commodities$(68) $(64) $(8) $79  
Total impact to statement of operations — interest rate contracts$—  $2  $(38) $17