$nrg 2013 Q4 10-K

Concept	2013 Q4	2013 Q3	2013 Q2
Revenue	$2.795B	$3.490B	$2.929B
YoY Change	35.48%	49.72%	35.23%
Cost Of Revenue	$1.944B	$2.373B	$2.051B
YoY Change	31.35%	36.38%	53.4%
Gross Profit	$851.0M	$1.117B	$878.0M
YoY Change	45.97%	89.0%	5.91%
Gross Profit Margin	30.45%	32.01%	29.98%
Selling, General & Admin	$225.0M	$213.0M	$230.0M
YoY Change	15.98%	-4.91%	25.68%
% of Gross Profit	26.44%	19.07%	26.2%
Research & Development	$21.00M	$24.00M	$21.00M
YoY Change	31.25%	0.0%	40.0%
% of Gross Profit	2.47%	2.15%	2.39%
Depreciation & Amortization	$292.0M	$327.0M	$313.0M
YoY Change	-1.02%	36.82%	33.76%
% of Gross Profit	34.31%	29.27%	35.65%
Operating Expenses	$555.0M	$237.0M	$251.0M
YoY Change	21.44%	5.8%	37.16%
Operating Profit	-$205.0M	$527.0M	$287.0M
YoY Change	-654.05%	512.79%	-27.71%
Interest Expense	-$217.0M	$228.0M	$206.0M
YoY Change	40.0%	39.88%	23.35%
% of Operating Profit		43.26%	71.78%
Other Income/Expense, Net	$4.000M	-$229.0M	-$219.0M
YoY Change	-42.86%	19.9%	45.03%
Pretax Income	-$517.0M	$298.0M	$68.00M
YoY Change	-398.84%	-383.81%	-72.36%
Income Tax	-$227.0M	$160.0M	-$63.00M
% Of Pretax Income		53.69%	-92.65%
Net Earnings	-$297.0M	$119.0M	$124.0M
YoY Change	-217.86%	-12000.0%	-50.6%
Net Earnings / Revenue	-10.63%	3.41%	4.23%
Basic Earnings Per Share	-$0.92	$0.36	$0.37
Diluted Earnings Per Share	-$0.92	$0.36	$0.37
COMMON SHARES
Basic Shares Outstanding	323.0M shares	323.0M shares	323.0M shares
Diluted Shares Outstanding	323.0M shares	327.0M shares	327.0M shares

Concept	2013 Q4	2013 Q3	2013 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.254B	$2.129B	$1.368B
YoY Change	8.0%	32.24%	19.06%
Cash & Equivalents	$2.254B	$2.129B	$1.368B
Short-Term Investments
Other Short-Term Assets	$2.691B	$2.548B	$3.066B
YoY Change	-30.34%	-22.9%	-34.63%
Inventory	$898.0M	$861.0M	$874.0M
Prepaid Expenses
Receivables	$1.214B	$1.366B	$1.290B
Other Receivables	$539.0M	$345.0M	$345.0M
Total Short-Term Assets	$7.596B	$7.249B	$6.943B
YoY Change	-4.72%	13.57%	-4.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$19.85B	$20.60B	$20.45B
YoY Change	-1.5%	29.84%	33.53%
Goodwill	$1.985B	$1.953B	$1.954B
YoY Change	1.48%	3.55%	3.61%
Intangibles
YoY Change
Long-Term Investments	$453.0M	$626.0M	$639.0M
YoY Change	-32.99%	-3.54%	-2.89%
Other Assets	$740.0M	$689.0M	$578.0M
YoY Change	23.54%	75.77%	47.45%
Total Long-Term Assets	$6.455B	$27.61B	$27.55B
YoY Change	-76.1%	32.52%	33.73%
TOTAL ASSETS
Total Short-Term Assets	$7.596B	$7.249B	$6.943B
Total Long-Term Assets	$6.455B	$27.61B	$27.55B
Total Assets	$33.90B	$34.86B	$34.49B
YoY Change	-3.09%	28.08%	23.82%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.038B	$1.140B	$1.196B
YoY Change	-11.43%	-8.51%	-11.41%
Accrued Expenses	$665.0M	$1.033B	$832.0M
YoY Change	-8.9%	71.03%	4.92%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$1.050B	$911.0M	$737.0M
YoY Change	614.29%	143.58%	938.03%
Total Short-Term Liabilities	$4.204B	$4.382B	$4.411B
YoY Change	-9.98%	-8.27%	-22.59%
LONG-TERM LIABILITIES
Long-Term Debt	$15.77B	$15.80B	$15.89B
YoY Change	0.2%	44.07%	51.54%
Other Long-Term Liabilities	$695.0M	$1.377B	$1.417B
YoY Change	-12.69%	53.68%	61.39%
Total Long-Term Liabilities	$18.98B	$19.35B	$19.53B
YoY Change	-4.12%	35.28%	39.43%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.204B	$4.382B	$4.411B
Total Long-Term Liabilities	$18.98B	$19.35B	$19.53B
Total Liabilities	$23.18B	$23.73B	$23.94B
YoY Change	-5.24%	24.38%	21.5%
SHAREHOLDERS EQUITY
Retained Earnings	$3.695B	$4.272B	$4.179B
YoY Change	-12.65%	6.75%	3.8%
Common Stock	$7.844B	$7.847B	$7.619B
YoY Change	3.33%	45.56%	41.46%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.942B	$1.942B	$1.944B
YoY Change	1.15%	1.15%	1.14%
Treasury Stock Shares	77.35M shares	77.35M shares	77.42M shares
Shareholders Equity	$9.851B	$10.30B	$9.985B
YoY Change
Total Liabilities & Shareholders Equity	$33.90B	$34.86B	$34.49B
YoY Change	-3.09%	28.08%	23.82%

Concept	2013 Q4	2013 Q3	2013 Q2
OPERATING ACTIVITIES
Net Income	-$297.0M	$119.0M	$124.0M
YoY Change	-217.86%	-12000.0%	-50.6%
Depreciation, Depletion And Amortization	$292.0M	$327.0M	$313.0M
YoY Change	-1.02%	36.82%	33.76%
Cash From Operating Activities	$447.0M	$901.0M	$46.00M
YoY Change	391.21%	90.49%	-93.04%
INVESTING ACTIVITIES
Capital Expenditures	-$406.0M	-$300.0M	-$468.0M
YoY Change	-55.97%	-65.95%	-50.94%
Acquisitions
YoY Change
Other Investing Activities	-$91.00M	-$356.0M	-$71.00M
YoY Change	-109.2%	-432.71%	22.41%
Cash From Investing Activities	-$497.0M	-$656.0M	-$539.0M
YoY Change	-841.79%	-15.25%	-46.74%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	176.0M	515.0M	156.0M
YoY Change	-45.0%	-32.59%	-68.03%
NET CHANGE
Cash From Operating Activities	447.0M	901.0M	46.00M
Cash From Investing Activities	-497.0M	-656.0M	-539.0M
Cash From Financing Activities	176.0M	515.0M	156.0M
Net Change In Cash	126.0M	760.0M	-337.0M
YoY Change	-73.64%	64.15%	-345.99%
FREE CASH FLOW
Cash From Operating Activities	$447.0M	$901.0M	$46.00M
Capital Expenditures	-$406.0M	-$300.0M	-$468.0M
Free Cash Flow	$853.0M	$1.201B	$514.0M
YoY Change	-15.79%	-11.3%	-68.17%

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2014	dei	Amendment Flag AmendmentFlag	false
CY2014	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2014	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2014	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2014
CY2014	dei	Document Period End Date DocumentPeriodEndDate	2014-12-31
CY2014	dei	Document Type DocumentType	10-K
CY2014	dei	Entity Central Index Key EntityCentralIndexKey	0001013871
CY2014Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	337695251	shares
CY2014	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2014	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2014Q2	dei	Entity Public Float EntityPublicFloat	9508294816	USD
CY2012	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	146000000	USD
CY2013	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	49000000	USD
CY2014Q4	nrg	Capital Expenditures CapitalExpenditures	984000000	USD
CY2014Q4	nrg	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Tax CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsTax	0	USD
CY2014	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	64000000	USD
CY2012	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	39000000	USD
CY2013	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	36000000	USD
CY2014	dei	Entity Registrant Name EntityRegistrantName	NRG ENERGY, INC.
CY2014	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2014	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2014Q4	nrg	Accidental Outage Maximum Recovery For Lost Revenues AccidentalOutageMaximumRecoveryForLostRevenues	215600000	USD
CY2014Q4	nrg	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	1199000000	USD
CY2012	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	231000000	USD
CY2013	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	-114000000	USD
CY2014	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	-26000000	USD
CY2012Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	87000000	USD
CY2013Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	7000000	USD
CY2014Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	0	USD
CY2012	nrg	Acquisition Related Transaction And Integration Costs AcquisitionRelatedTransactionAndIntegrationCosts	107000000	USD
CY2014Q4	nrg	Additional Mutual Lost Revenue Insurance Weekly Maximum AdditionalMutualLostRevenueInsuranceWeeklyMaximum	1980000	USD
CY2014	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	46000000	USD
CY2014Q4	nrg	Amount Of Credit Exposure To Significant Portion Of All Counterparties AmountOfCreditExposureToSignificantPortionOfAllCounterparties	963000000	USD
CY2014Q4	nrg	Amount Of Net Counterparty Credit Risk Exposure To Certain Counterparties AmountOfNetCounterpartyCreditRiskExposureToCertainCounterparties	312000000	USD
CY2014	nrg	Asset Retirement Obligation Accretion Nuclear Decommissioning AssetRetirementObligationAccretionNuclearDecommissioning	16000000	USD
CY2013Q4	nrg	Capital Expenditures CapitalExpenditures	1576000000	USD
CY2012	nrg	Changes In Derivatives ChangesInDerivatives	124000000	USD
CY2013	nrg	Changes In Derivatives ChangesInDerivatives	164000000	USD
CY2014	nrg	Changes In Derivatives ChangesInDerivatives	-61000000	USD
CY2012	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	37000000	USD
CY2013	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	15000000	USD
CY2014	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	19000000	USD
CY2014Q4	nrg	Collateral Held Cash And Letters Of Credit CollateralHeldCashAndLettersOfCredit	12000000	USD
CY2014Q4	nrg	Common Stock Capital Shares Reserved For Employee Stock Purchase Plan CommonStockCapitalSharesReservedForEmployeeStockPurchasePlan	1560052	shares
CY2013Q4	nrg	Common Stock Dividends Proposed Annual Percentage Increase CommonStockDividendsProposedAnnualPercentageIncrease	0.33	pure
CY2014Q4	nrg	Common Stock Dividends Proposed Annual Percentage Increase CommonStockDividendsProposedAnnualPercentageIncrease	0.17	pure
CY2012	nrg	Comprehensive Income Loss Net Of Tax Available For Common Stockholders ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders	62000000	USD
CY2013	nrg	Comprehensive Income Loss Net Of Tax Available For Common Stockholders ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders	-240000000	USD
CY2014	nrg	Comprehensive Income Loss Net Of Tax Available For Common Stockholders ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders	-121000000	USD
CY2012	nrg	Consent Fees Paid Preferred Stock ConsentFeesPaidPreferredStock	0	USD
CY2013	nrg	Consent Fees Paid Preferred Stock ConsentFeesPaidPreferredStock	0	USD
CY2014	nrg	Consent Fees Paid Preferred Stock ConsentFeesPaidPreferredStock	5000000	USD
CY2012	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	97000000	USD
CY2013	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	90000000	USD
CY2014	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	86000000	USD
CY2014	nrg	Costs Incurred Asset Retirement Obligation Incurred For Acquisition CostsIncurredAssetRetirementObligationIncurredForAcquisition	95000000	USD
CY2014	nrg	Counterparty Credit Risk Exposure Percentage Of Credit Risk Roll Off CounterpartyCreditRiskExposurePercentageOfCreditRiskRollOff	0.91	pure
CY2014	nrg	Counterparty Credit Risk Exposure Percentage Threshold CounterpartyCreditRiskExposurePercentageThreshold	0.10	pure
CY2014Q4	nrg	Credit Derivative Maximum Net Exposure Percentage CreditDerivativeMaximumNetExposurePercentage	1.00	pure
CY2012	nrg	Decrease In Fixed Assets Accrued Grants DecreaseInFixedAssetsAccruedGrants	-87000000	USD
CY2013	nrg	Decrease In Fixed Assets Accrued Grants DecreaseInFixedAssetsAccruedGrants	-681000000	USD
CY2014	nrg	Decrease In Fixed Assets Accrued Grants DecreaseInFixedAssetsAccruedGrants	-711000000	USD
CY2013Q4	nrg	Deferred Tax Assets Differences Between Book And Tax Basis Of Contracts DeferredTaxAssetsDifferencesBetweenBookAndTaxBasisOfContracts	285000000	USD
CY2014Q4	nrg	Deferred Tax Assets Differences Between Book And Tax Basis Of Contracts DeferredTaxAssetsDifferencesBetweenBookAndTaxBasisOfContracts	531000000	USD
CY2013Q4	nrg	Deferred Tax Assets Federal Benefit On State Unrecognized Tax Benefits DeferredTaxAssetsFederalBenefitOnStateUnrecognizedTaxBenefits	23000000	USD
CY2014Q4	nrg	Deferred Tax Assets Federal Benefit On State Unrecognized Tax Benefits DeferredTaxAssetsFederalBenefitOnStateUnrecognizedTaxBenefits	17000000	USD
CY2013Q4	nrg	Deferred Tax Assets Foreign Capital Loss Carryforwards DeferredTaxAssetsForeignCapitalLossCarryforwards	1000000	USD
CY2014Q4	nrg	Deferred Tax Assets Foreign Capital Loss Carryforwards DeferredTaxAssetsForeignCapitalLossCarryforwards	1000000	USD
CY2013Q4	nrg	Deferred Tax Assets Intangibles DeferredTaxAssetsIntangibles	20000000	USD
CY2014Q4	nrg	Deferred Tax Assets Intangibles DeferredTaxAssetsIntangibles	0	USD
CY2013Q4	nrg	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation Accrued Vacation And Other Reserves DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensationAccruedVacationAndOtherReserves	203000000	USD
CY2014Q4	nrg	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation Accrued Vacation And Other Reserves DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensationAccruedVacationAndOtherReserves	266000000	USD
CY2013Q4	nrg	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits	168000000	USD
CY2014Q4	nrg	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits	157000000	USD
CY2013Q4	nrg	Deferred Tax Assets Tax Deferred Expenses Deferred Financing Costs DeferredTaxAssetsTaxDeferredExpensesDeferredFinancingCosts	3000000	USD
CY2014Q4	nrg	Deferred Tax Assets Tax Deferred Expenses Deferred Financing Costs DeferredTaxAssetsTaxDeferredExpensesDeferredFinancingCosts	23000000	USD
CY2013Q4	nrg	Deferred Tax Liabilities Emissions Allowances DeferredTaxLiabilitiesEmissionsAllowances	15000000	USD
CY2014Q4	nrg	Deferred Tax Liabilities Emissions Allowances DeferredTaxLiabilitiesEmissionsAllowances	25000000	USD
CY2013Q4	nrg	Deferredtaxassetnetbeforevaluationallowance Deferredtaxassetnetbeforevaluationallowance	1400000000	USD
CY2014Q4	nrg	Deferredtaxassetnetbeforevaluationallowance Deferredtaxassetnetbeforevaluationallowance	1500000000	USD
CY2013Q4	nrg	Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral	345000000	USD
CY2014Q4	nrg	Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral	368000000	USD
CY2014Q4	nrg	Derivative Asset Fair Value Determined Using Valuation Techniques Percentage DerivativeAssetFairValueDeterminedUsingValuationTechniquesPercentage	0.11	pure
CY2013Q4	nrg	Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset	0	USD
CY2014Q4	nrg	Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset	0	USD
CY2013Q4	nrg	Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash	-44000000	USD
CY2014Q4	nrg	Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash	-45000000	USD
CY2014Q4	nrg	Derivative Liability Fair Value Determined Using Valuation Techniques Percentage DerivativeLiabilityFairValueDeterminedUsingValuationTechniquesPercentage	0.09	pure
CY2014Q4	nrg	Derivative Net Liability Position Collateral Required Adequate Assurance Clauses DerivativeNetLiabilityPositionCollateralRequiredAdequateAssuranceClauses	61000000	USD
CY2014Q4	nrg	Derivative Net Liability Position Collateral Required Contracts With Credit Rating Contingent Feature DerivativeNetLiabilityPositionCollateralRequiredContractsWithCreditRatingContingentFeature	42000000	USD
CY2014Q4	nrg	Derivative Net Liability Position No Counterparty Collateral Call DerivativeNetLiabilityPositionNoCounterpartyCollateralCall	30000000	USD
CY2012	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	46000000	USD
CY2013	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	7000000	USD
CY2014	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	45000000	USD
CY2012	nrg	Development Costs And Expenses DevelopmentCostsAndExpenses	68000000	USD
CY2013	nrg	Development Costs And Expenses DevelopmentCostsAndExpenses	84000000	USD
CY2014	nrg	Development Costs And Expenses DevelopmentCostsAndExpenses	91000000	USD
CY2012	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	13000000	USD
CY2013	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	11000000	USD
CY2014	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	30000000	USD
CY2012	nrg	Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships	0	USD
CY2013	nrg	Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships	8000000	USD
CY2014	nrg	Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships	4000000	USD
CY2014	nrg	Employee Stock Purchase Plan Exercise Price As Percentage Of Fair Value EmployeeStockPurchasePlanExercisePriceAsPercentageOfFairValue	0.85	pure
CY2014	nrg	Employee Stock Purchase Plan Maximum Percentage Of Compensation Eligible EmployeeStockPurchasePlanMaximumPercentageOfCompensationEligible	0.10	pure
CY2014Q4	nrg	Environmental Capital Expenditures Estimated EnvironmentalCapitalExpendituresEstimated	641000000	USD
CY2012	nrg	Equity In Earnings Of Consolidated Subsidiaries EquityInEarningsOfConsolidatedSubsidiaries	0	USD
CY2013	nrg	Equity In Earnings Of Consolidated Subsidiaries EquityInEarningsOfConsolidatedSubsidiaries	0	USD
CY2014	nrg	Equity In Earnings Of Consolidated Subsidiaries EquityInEarningsOfConsolidatedSubsidiaries	0	USD
CY2014	nrg	Estimated Counterparty Credit Risk Exposure To Certain Counterparties EstimatedCounterpartyCreditRiskExposureToCertainCounterparties	3400000000	USD
CY2014	nrg	Estimated Counterparty Credit Risk Exposure To Certain Counterparties Period EstimatedCounterpartyCreditRiskExposureToCertainCounterpartiesPeriod	P5Y
CY2013	nrg	Fair Value Assets Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInEarnings	1000000	USD
CY2014Q4	nrg	Fair Value Assets Measured On Recurring Basis Valuation Techniques Impact Of Credit Reserve To Fair Value FairValueAssetsMeasuredOnRecurringBasisValuationTechniquesImpactOfCreditReserveToFairValue	-2000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings	-12000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Nuclear Decommissioning Obligations FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInNuclearDecommissioningObligations	10000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInOtherComprehensiveIncome	4000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityPurchases	16000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySales	-3000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersIntoLevel3	6000000	USD
CY2013	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersOutOfLevel3	27000000	USD
CY2012Q4	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue	47000000	USD
CY2013Q4	nrg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue	95000000	USD
CY2013Q4	nrg	Fair Valueof Gross Derivative Assets Liabilities Net FairValueofGrossDerivativeAssetsLiabilitiesNet	389000000	USD
CY2014Q4	nrg	Fair Valueof Gross Derivative Assets Liabilities Net FairValueofGrossDerivativeAssetsLiabilitiesNet	413000000	USD
CY2013	nrg	Finite Lived Intangible Assets Acquired During Period FiniteLivedIntangibleAssetsAcquiredDuringPeriod	99000000	USD
CY2014	nrg	Finite Lived Intangible Assets Acquired During Period FiniteLivedIntangibleAssetsAcquiredDuringPeriod	1541000000	USD
CY2013	nrg	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	2000000	USD
CY2014	nrg	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	6000000	USD
CY2013	nrg	Finite Lived Intangible Assets Purchases FiniteLivedIntangibleAssetsPurchases	118000000	USD
CY2014	nrg	Finite Lived Intangible Assets Purchases FiniteLivedIntangibleAssetsPurchases	182000000	USD
CY2013	nrg	Finite Lived Intangible Assets Usage FiniteLivedIntangibleAssetsUsage	14000000	USD
CY2014	nrg	Finite Lived Intangible Assets Usage FiniteLivedIntangibleAssetsUsage	-34000000	USD
CY2014	nrg	Finite Lived Intangible Assets Write Off Of Fully Amortized Intangible Assets FiniteLivedIntangibleAssetsWriteOffOfFullyAmortizedIntangibleAssets	-843000000	USD
CY2014Q4	nrg	Forty Four Percent Maximum Assessment FortyFourPercentMaximumAssessment	0.44	pure
CY2013Q4	nrg	Funds Deposited By Counterparties FundsDepositedByCounterparties	63000000	USD
CY2014Q4	nrg	Funds Deposited By Counterparties FundsDepositedByCounterparties	72000000	USD
CY2014	nrg	Future Taxable Income To Fully Realize Net Federal And State Unitary Deferred Tax Assets Before Expiration FutureTaxableIncomeToFullyRealizeNetFederalAndStateUnitaryDeferredTaxAssetsBeforeExpiration	4300000000	USD
CY2012	nrg	Gains Losses On Extinguishment Of Debt Non Cash Portion GainsLossesOnExtinguishmentOfDebtNonCashPortion	-9000000	USD
CY2013	nrg	Gains Losses On Extinguishment Of Debt Non Cash Portion GainsLossesOnExtinguishmentOfDebtNonCashPortion	15000000	USD
CY2014	nrg	Gains Losses On Extinguishment Of Debt Non Cash Portion GainsLossesOnExtinguishmentOfDebtNonCashPortion	-25000000	USD
CY2014Q4	nrg	Genon Ltip Shares Remaining GenonLtipSharesRemaining	2150019	shares
CY2012	nrg	Gross Receipts Tax GrossReceiptsTax	79000000	USD
CY2013	nrg	Gross Receipts Tax GrossReceiptsTax	88000000	USD
CY2014	nrg	Gross Receipts Tax GrossReceiptsTax	108000000	USD
CY2014Q4	nrg	Guarantee Maturity Between One To Three Years GuaranteeMaturityBetweenOneToThreeYears	466000000	USD
CY2014Q4	nrg	Guarantee Maturity Between Three To Five Years GuaranteeMaturityBetweenThreeToFiveYears	265000000	USD
CY2014Q4	nrg	Guarantee Maturity Greater Than Five Years GuaranteeMaturityGreaterThanFiveYears	2575000000	USD
CY2014Q4	nrg	Guarantee Maturity Less Than One Year GuaranteeMaturityLessThanOneYear	1854000000	USD
CY2013Q4	nrg	Guarantee Obligations Estimated Exposure GuaranteeObligationsEstimatedExposure	4081000000	USD
CY2014Q4	nrg	Guarantee Obligations Estimated Exposure GuaranteeObligationsEstimatedExposure	5160000000	USD
CY2012	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	0	USD
CY2013	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	-558000000	USD
CY2014	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	-97000000	USD
CY2012	nrg	Income Tax Reconciliation Bargain Purchase Gain IncomeTaxReconciliationBargainPurchaseGain	-104000000	USD
CY2013	nrg	Income Tax Reconciliation Bargain Purchase Gain IncomeTaxReconciliationBargainPurchaseGain	0	USD
CY2014	nrg	Income Tax Reconciliation Bargain Purchase Gain IncomeTaxReconciliationBargainPurchaseGain	0	USD
CY2012	nrg	Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance	0	USD
CY2013	nrg	Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance	10000000	USD
CY2014	nrg	Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance	0	USD
CY2012	nrg	Income Tax Reconciliation Expiration Capital Losses IncomeTaxReconciliationExpirationCapitalLosses	0	USD
CY2013	nrg	Income Tax Reconciliation Expiration Capital Losses IncomeTaxReconciliationExpirationCapitalLosses	10000000	USD
CY2014	nrg	Income Tax Reconciliation Expiration Capital Losses IncomeTaxReconciliationExpirationCapitalLosses	0	USD
CY2012	nrg	Income Tax Reconciliation Impact Of Non Taxible Equity Earning IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning	-7000000	USD
CY2013	nrg	Income Tax Reconciliation Impact Of Non Taxible Equity Earning IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning	-14000000	USD
CY2014	nrg	Income Tax Reconciliation Impact Of Non Taxible Equity Earning IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning	-11000000	USD
CY2014	nrg	Income Taxes Threshold Percentage IncomeTaxesThresholdPercentage	0.5	pure
CY2012	nrg	Increase Decrease In Notes Receivable IncreaseDecreaseInNotesReceivable	-24000000	USD
CY2013	nrg	Increase Decrease In Notes Receivable IncreaseDecreaseInNotesReceivable	-11000000	USD
CY2014	nrg	Increase Decrease In Notes Receivable IncreaseDecreaseInNotesReceivable	25000000	USD
CY2012	nrg	Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects	-164000000	USD
CY2013	nrg	Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects	26000000	USD
CY2014	nrg	Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects	206000000	USD
CY2012	nrg	Increase Decrease In Treasury Stock Shares Loaned Returned IncreaseDecreaseInTreasuryStockSharesLoanedReturned	0	USD
CY2013	nrg	Increase Decrease In Treasury Stock Shares Loaned Returned IncreaseDecreaseInTreasuryStockSharesLoanedReturned	0	USD
CY2014	nrg	Increase Decrease In Treasury Stock Shares Loaned Returned IncreaseDecreaseInTreasuryStockSharesLoanedReturned	-401000000	USD
CY2014Q4	nrg	Industry Mutual Insurance Company Multiplier IndustryMutualInsuranceCompanyMultiplier	10	pure
CY2012	nrg	Inter Segment Sales InterSegmentSales	1838000000	USD
CY2013	nrg	Inter Segment Sales InterSegmentSales	2307000000	USD
CY2014	nrg	Inter Segment Sales InterSegmentSales	1914000000	USD
CY2012	nrg	Intercompany Loans To Receipts From Subsidiaries IntercompanyLoansToReceiptsFromSubsidiaries	0	USD
CY2013	nrg	Intercompany Loans To Receipts From Subsidiaries IntercompanyLoansToReceiptsFromSubsidiaries	0	USD
CY2014	nrg	Intercompany Loans To Receipts From Subsidiaries IntercompanyLoansToReceiptsFromSubsidiaries	0	USD
CY2013Q4	nrg	Interest Payable Other Accrued Liabilities And Other Liabilities Current InterestPayableOtherAccruedLiabilitiesAndOtherLiabilitiesCurrent	998000000	USD
CY2012	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	-25000000	USD
CY2013	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	0	USD
CY2014	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	-103000000	USD
CY2014Q4	nrg	Longterm Debt Maturities Repaymentsof Principal LongtermDebtMaturitiesRepaymentsofPrincipal	20132000000	USD
CY2014	nrg	Losson Extinguishmentof Preferred Stock LossonExtinguishmentofPreferredStock	42000000	USD
CY2014	nrg	Maximum Remaining Termunder Individual Purchased Power Contract MaximumRemainingTermunderIndividualPurchasedPowerContract	P5Y
CY2008	nrg	Minimum Civil Penalties Which May Be Assumed MinimumCivilPenaltiesWhichMayBeAssumed	200000	USD
CY2014Q4	nrg	Mutual Lost Revenue Insurance Maximum Weekly Recovery MutualLostRevenueInsuranceMaximumWeeklyRecovery	0	USD
CY2014Q4	nrg	Mutual Property Insurance Additional Blanket Policy Property Coverage MutualPropertyInsuranceAdditionalBlanketPolicyPropertyCoverage	1000000000	USD
CY2014Q4	nrg	Mutual Property Insurance Individual Maximum Property Coverage Limit MutualPropertyInsuranceIndividualMaximumPropertyCoverageLimit	1750000000	USD
CY2014Q4	nrg	Net Credit Exposure NetCreditExposure	953000000	USD
CY2014	nrg	Noncashadjustmentforissuanceofconvertibledebt Noncashadjustmentforissuanceofconvertibledebt	23000000	USD
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Assessment NuclearInsuranceFinancialProtectionPoolMaximumAssessment	127000000	USD
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Assessment Adminstrative Fee Asa Percent NuclearInsuranceFinancialProtectionPoolMaximumAssessmentAdminstrativeFeeAsaPercent	0.05	pure
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Nuclear Operator Maximum Annual Assessment NuclearInsuranceFinancialProtectionPoolNuclearOperatorMaximumAnnualAssessment	8000000	USD
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Nuclear Operator Total Assessment NuclearInsuranceFinancialProtectionPoolNuclearOperatorTotalAssessment	112000000	USD
CY2013Q4	nrg	Nuclear Decommissioning Trust Fund Liability Noncurrent NuclearDecommissioningTrustFundLiabilityNoncurrent	324000000	USD
CY2014Q4	nrg	Nuclear Decommissioning Trust Fund Liability Noncurrent NuclearDecommissioningTrustFundLiabilityNoncurrent	333000000	USD
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Annual Assessment NuclearInsuranceFinancialProtectionPoolMaximumAnnualAssessment	19000000	USD
CY2014	nrg	Number Of Years Board Of Directors Of Industry Mutual Insurance Company Can Adjust Policy After Policy Expires NumberOfYearsBoardOfDirectorsOfIndustryMutualInsuranceCompanyCanAdjustPolicyAfterPolicyExpires	P6Y
CY2014Q4	nrg	Other Assets Noncurrent Emission Allowances OtherAssetsNoncurrentEmissionAllowances	53000000	USD
CY2013Q4	nrg	Out Of Market Contracts OutOfMarketContracts	1177000000	USD
CY2014Q4	nrg	Nuclear Insurance Financial Protection Pool Value NuclearInsuranceFinancialProtectionPoolValue	13200000000	USD
CY2014Q4	nrg	Nuclear Insurance Per Incident Coverage Limit NuclearInsurancePerIncidentCoverageLimit	13600000000	USD
CY2014Q4	nrg	Nuclear Insurance Requirement Per Site NuclearInsuranceRequirementPerSite	375000000	USD
CY2012Q3	nrg	Number Of Pjm Transmission Owners Who Filed Motion NumberOfPjmTransmissionOwnersWhoFiledMotion	3
CY2010Q2	nrg	Number Of Significant Orders Issued By Authority NumberOfSignificantOrdersIssuedByAuthority	2	orders
CY2012	nrg	Operating Cost And Expense Excluding Depreciation Depletion And Amortization OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization	6947000000	USD
CY2013	nrg	Operating Cost And Expense Excluding Depreciation Depletion And Amortization OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization	9025000000	USD
CY2014	nrg	Operating Cost And Expense Excluding Depreciation Depletion And Amortization OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization	12821000000	USD
CY2014Q4	nrg	Out Of Market Contracts OutOfMarketContracts	1244000000	USD
CY2012	nrg	Payment Of Intercompany Dividends PaymentOfIntercompanyDividends	0	USD
CY2012	nrg	Payments To Settle Acquired Derivatives That Include Financing Elements PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements	68000000	USD
CY2013	nrg	Payments To Settle Acquired Derivatives That Include Financing Elements PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements	-267000000	USD
CY2014	nrg	Payments To Settle Acquired Derivatives That Include Financing Elements PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements	-9000000	USD
CY2014	nrg	Period Beyondwhich Comapny Can Not Predict Holdingof Collateral PeriodBeyondwhichComapnyCanNotPredictHoldingofCollateral	P12M
CY2014Q4	nrg	Power Generation Capacity Megawatts PowerGenerationCapacityMegawatts	52000
CY2012Q3	nrg	Power Generation Participation Megawatts PowerGenerationParticipationMegawatts	400
CY2013Q4	nrg	Prepaid Expense And Other Assets Current Less Accounts Receivable Affiliate PrepaidExpenseAndOtherAssetsCurrentLessAccountsReceivableAffiliate	471000000	USD
CY2014Q4	nrg	Prepaid Expense And Other Assets Current Less Accounts Receivable Affiliate PrepaidExpenseAndOtherAssetsCurrentLessAccountsReceivableAffiliate	438000000	USD
CY2012	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2013	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2014	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2012	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	62000000	USD
CY2013	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	55000000	USD
CY2014	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	916000000	USD
CY2013Q4	nrg	Property Plant And Equipment In Service PropertyPlantAndEquipmentInService	23649000000	USD
CY2014Q4	nrg	Property Plant And Equipment In Service PropertyPlantAndEquipmentInService	29487000000	USD
CY2014	nrg	Redeemable Noncontrolling Increasefrom Saleof Parent Equity Interest RedeemableNoncontrollingIncreasefromSaleofParentEquityInterest	36000000	USD
CY2014Q4	nrg	Redeemable Preferred Stock Fair Value RedeemablePreferredStockFairValue	291000000	USD
CY2011Q4	nrg	Regulatory Charges Owed By Third Party RegulatoryChargesOwedByThirdParty	22000000	USD
CY2012Q3	nrg	Regulatory Charges Settled By Third Party RegulatoryChargesSettledByThirdParty	24000000	USD
CY2012Q3	nrg	Regulatory Charges Settled By Third Party Additional RegulatoryChargesSettledByThirdPartyAdditional	1000000	USD
CY2012	nrg	Revenues From Resale Of Purchased Power RevenuesFromResaleOfPurchasedPower	151000000	USD
CY2013	nrg	Revenues From Resale Of Purchased Power RevenuesFromResaleOfPurchasedPower	166000000	USD
CY2014	nrg	Revenues From Resale Of Purchased Power RevenuesFromResaleOfPurchasedPower	387000000	USD
CY2012	nrg	Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity	0	USD
CY2013	nrg	Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity	0	USD
CY2014	nrg	Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity	-32000000	USD
CY2012	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges	-20000000	USD
CY2013	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges	357000000	USD
CY2014	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges	333000000	USD
CY2012	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	247000000	USD
CY2013	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	105000000	USD
CY2014	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	15000000	USD
CY2012	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	60000000	USD
CY2013	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	50000000	USD
CY2014	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	-1000000	USD
CY2014	nrg	Share Based Compensation Arrangement By Share Based Payment Award Number Of Types Of Awards ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfAwards	5	TypesOfAwards
CY2014Q4	nrg	Shares Authorized For Issuance Under Genon Ltip SharesAuthorizedForIssuanceUnderGenonLtip	5558390	shares
CY2014Q4	nrg	Steam And Chilled Water Capacity Megawatts Thermal Equivalent SteamAndChilledWaterCapacityMegawattsThermalEquivalent	1444
CY2013Q4	nrg	Temporary Equity Liquidation Value TemporaryEquityLiquidationValue	250	USD
CY2014Q4	nrg	Temporary Equity Liquidation Value TemporaryEquityLiquidationValue	250	USD
CY2013Q4	nrg	Total Other Assets TotalOtherAssets	6455000000	USD
CY2014Q4	nrg	Total Other Assets TotalOtherAssets	9716000000	USD
CY2014	nrg	Twenty Four Months TwentyFourMonths	P24M
CY2012	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	-268000000	USD
CY2013	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	-285000000	USD
CY2014	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	13000000	USD
CY2012	nrg	Unrealized Gain Loss On Derivatives Mark To Market Trading Activites UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites	-14000000	USD
CY2013	nrg	Unrealized Gain Loss On Derivatives Mark To Market Trading Activites UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites	-43000000	USD
CY2014	nrg	Unrealized Gain Loss On Derivatives Mark To Market Trading Activites UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites	14000000	USD
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1038000000	USD
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1060000000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1214000000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1322000000	USD
CY2014Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	16000000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6573000000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7890000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	132000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-31000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-23000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-68000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	53000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	15000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	1000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	5000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-174000000	USD
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	7840000000	USD
CY2014Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	8327000000	USD
CY2014Q1	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	23000000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	34000000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	36000000	USD
CY2014	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	45000000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	42000000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	40000000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23000000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	31000000	USD
CY2013	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	-33000000	USD
CY2014	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	-12000000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	310000000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	279000000	USD
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	17000000	shares
CY2014	us-gaap	Asset Impairment Charges AssetImpairmentCharges	97000000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	629000000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	268000000	USD
CY2014Q4	us-gaap	Amount Of Restricted Net Assets For Consolidated And Unconsolidated Subsidiaries AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	5200000000	USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2013	us-gaap	Asset Impairment Charges AssetImpairmentCharges	459000000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	24000000	shares
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	25000000	shares
CY2014Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	763000000	USD
CY2014	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	23000000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-7000000	USD
CY2014	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-8000000	USD
CY2013Q4	us-gaap	Assets Assets	33902000000	USD
CY2014Q4	us-gaap	Assets Assets	40665000000	USD
CY2013Q4	us-gaap	Assets Current AssetsCurrent	7596000000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	8582000000	USD
CY2013Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	6455000000	USD
CY2014Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	9716000000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	12000000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	25000000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	29000000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	7000000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	8000000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	8000000	USD
CY2013	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	207000000	USD
CY2014	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	218000000	USD
CY2013	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	3000000	USD
CY2014	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	2000000	USD
CY2013Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	573000000	USD
CY2014Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	831000000	USD
CY2012	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	107000000	USD
CY2013	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	128000000	USD
CY2014	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	84000000	USD
CY2012	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	296000000	USD
CY2013	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2014	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2012Q4	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	28000000	USD
CY2013	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	128000000	USD
CY2014	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	84000000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	563000000	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	405000000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	87000000	USD
CY2012	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	983000000	USD
CY2013	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2014	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1105000000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2087000000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2254000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2116000000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	982000000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	167000000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-138000000	USD
CY2014	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-15000000	USD
CY2014Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	35413743	shares
CY2012Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2012Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.00
CY2012Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.00
CY2012Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2012Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2013Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2013Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2013Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2013Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2014Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2014Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.14
CY2014Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.14
CY2014Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.14
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2014	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
CY2013Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2013Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	401126780	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	415506176	shares
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	323779252	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	336662624	shares
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	4000000	USD
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	4000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	71000000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-231000000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-65000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	20000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	20000000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	34000000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	8000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	91000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	91000000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-197000000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-57000000	USD
CY2013Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	2775000000	USD
CY2014Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	770000000	USD
CY2014Q1	us-gaap	Convertible Debt ConvertibleDebt	345000000	USD
CY2013Q4	us-gaap	Convertible Debt Fair Value Disclosures ConvertibleDebtFairValueDisclosures	0	USD
CY2014Q4	us-gaap	Convertible Debt Fair Value Disclosures ConvertibleDebtFairValueDisclosures	326000000	USD
CY2012	us-gaap	Cost Of Revenue CostOfRevenue	6140000000	USD
CY2013	us-gaap	Cost Of Revenue CostOfRevenue	8121000000	USD
CY2014	us-gaap	Cost Of Revenue CostOfRevenue	11779000000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	8072000000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	10952000000	USD
CY2014	us-gaap	Costs And Expenses CostsAndExpenses	14616000000	USD
CY2014	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	15000000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	13000000	USD
CY2013	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	0	USD
CY2014	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	0	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	33000000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11000000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8000000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	20000000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	11000000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8000000	USD
CY2013Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	16817000000	USD
CY2014Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	20374000000	USD
CY2014	us-gaap	Debt Instrument Description Of Variable Rate Basis DebtInstrumentDescriptionOfVariableRateBasis	3 month LIBOR
CY2013Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	300000000	USD
CY2014Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	234000000	USD
CY2013Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	294000000	USD
CY2014Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	310000000	USD
CY2013Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	551000000	USD
CY2014Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	585000000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-326000000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-207000000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-50000000	USD
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-10000000	USD
CY2013	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-29000000	USD
CY2014	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	4000000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-360000000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-293000000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5000000	USD
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1111000000	USD
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1632000000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-24000000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-57000000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	41000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	1000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	0	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2840000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3456000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1438000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	29000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1559000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	258000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	174000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	1202000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	1406000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2549000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3191000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	1381000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	1523000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	77000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	65000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	161000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	302000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	15000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	308000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	357000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	57000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	77000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	18000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	9000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	111000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	99000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	291000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	265000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	334000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	320000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	191000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	202000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	0	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	99000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	540000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	849000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	22000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	21000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	22000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	127000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	9000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	8000000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	-19000000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	-1000000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	24000000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	2000000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	24000000	USD
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	34000000	USD
CY2014	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	47000000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	950000000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1256000000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1523000000	USD
CY2013Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	63000000	USD
CY2014Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	72000000	USD
CY2013Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	276000000	USD
CY2014Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	187000000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1639000000	USD
CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2905000000	USD

CY2014

dei

Amendment Flag

AmendmentFlag

false

CY2014

dei

Current Fiscal Year End Date

CurrentFiscalYearEndDate

--12-31

CY2014

dei

Document Fiscal Period Focus

DocumentFiscalPeriodFocus

FY

CY2014

dei

Document Fiscal Year Focus

DocumentFiscalYearFocus

2014

CY2014

dei

Document Period End Date

DocumentPeriodEndDate

2014-12-31

CY2014

dei

Document Type

DocumentType

10-K

CY2014

dei

Entity Central Index Key

EntityCentralIndexKey

0001013871

CY2014Q4

dei

Entity Common Stock Shares Outstanding

EntityCommonStockSharesOutstanding

337695251

shares

CY2014

dei

Entity Current Reporting Status

EntityCurrentReportingStatus

Yes

CY2014

dei

Entity Filer Category

EntityFilerCategory

Large Accelerated Filer

CY2014Q2

dei

Entity Public Float

EntityPublicFloat

9508294816

USD

CY2012

nrg

Amortization Of Intangibles And Out Of Market Contracts

AmortizationOfIntangiblesAndOutOfMarketContracts

146000000

USD

CY2013

nrg

Amortization Of Intangibles And Out Of Market Contracts

AmortizationOfIntangiblesAndOutOfMarketContracts

49000000

USD

CY2014Q4

nrg

Capital Expenditures

CapitalExpenditures

984000000

USD

CY2014Q4

nrg

Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Tax

CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsTax

0

USD

CY2014

nrg

Amortization Of Intangibles And Out Of Market Contracts

AmortizationOfIntangiblesAndOutOfMarketContracts

64000000

USD

CY2012

nrg

Amortization Of Nuclear Fuel

AmortizationOfNuclearFuel

39000000

USD

CY2013

nrg

Amortization Of Nuclear Fuel

AmortizationOfNuclearFuel

36000000

USD

CY2014

dei

Entity Registrant Name

EntityRegistrantName

NRG ENERGY, INC.

CY2014

dei

Entity Voluntary Filers

EntityVoluntaryFilers

No

CY2014

dei

Entity Well Known Seasoned Issuer

EntityWellKnownSeasonedIssuer

Yes

CY2014Q4

nrg

Accidental Outage Maximum Recovery For Lost Revenues

AccidentalOutageMaximumRecoveryForLostRevenues

215600000

USD

CY2014Q4

nrg

Accrued Expenses And Other Current Liabilities

AccruedExpensesAndOtherCurrentLiabilities

1199000000

USD

CY2012

nrg

Accrued Expenses And Other Current Liabilities Operating

AccruedExpensesAndOtherCurrentLiabilitiesOperating

231000000

USD

CY2013

nrg

Accrued Expenses And Other Current Liabilities Operating

AccruedExpensesAndOtherCurrentLiabilitiesOperating

-114000000

USD

CY2014

nrg

Accrued Expenses And Other Current Liabilities Operating

AccruedExpensesAndOtherCurrentLiabilitiesOperating

-26000000

USD

CY2012Q4

nrg

Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount

AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount

87000000

USD

CY2013Q4

nrg

Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount

AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount

7000000

USD

CY2014Q4

nrg

Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount

AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount

0

USD

CY2012

nrg

Acquisition Related Transaction And Integration Costs

AcquisitionRelatedTransactionAndIntegrationCosts

107000000

USD

CY2014Q4

nrg

Additional Mutual Lost Revenue Insurance Weekly Maximum

AdditionalMutualLostRevenueInsuranceWeeklyMaximum

1980000

USD

CY2014

nrg

Amortization Of Nuclear Fuel

AmortizationOfNuclearFuel

46000000

USD

CY2014Q4

nrg

Amount Of Credit Exposure To Significant Portion Of All Counterparties

AmountOfCreditExposureToSignificantPortionOfAllCounterparties

963000000

USD

CY2014Q4

nrg

Amount Of Net Counterparty Credit Risk Exposure To Certain Counterparties

AmountOfNetCounterpartyCreditRiskExposureToCertainCounterparties

312000000

USD

CY2014

nrg

Asset Retirement Obligation Accretion Nuclear Decommissioning

AssetRetirementObligationAccretionNuclearDecommissioning

16000000

USD

CY2013Q4

nrg

Capital Expenditures

CapitalExpenditures

1576000000

USD

CY2012

nrg

Changes In Derivatives

ChangesInDerivatives

124000000

USD

CY2013

nrg

Changes In Derivatives

ChangesInDerivatives

164000000

USD

CY2014

nrg

Changes In Derivatives

ChangesInDerivatives

-61000000

USD

CY2012

nrg

Changes In Nuclear Decommissioning Trust Liability

ChangesInNuclearDecommissioningTrustLiability

37000000

USD

CY2013

nrg

Changes In Nuclear Decommissioning Trust Liability

ChangesInNuclearDecommissioningTrustLiability

15000000

USD

CY2014

nrg

Changes In Nuclear Decommissioning Trust Liability

ChangesInNuclearDecommissioningTrustLiability

19000000

USD

CY2014Q4

nrg

Collateral Held Cash And Letters Of Credit

CollateralHeldCashAndLettersOfCredit

12000000

USD

CY2014Q4

nrg

Common Stock Capital Shares Reserved For Employee Stock Purchase Plan

CommonStockCapitalSharesReservedForEmployeeStockPurchasePlan

1560052

shares

CY2013Q4

nrg

Common Stock Dividends Proposed Annual Percentage Increase

CommonStockDividendsProposedAnnualPercentageIncrease

0.33

pure

CY2014Q4

nrg

Common Stock Dividends Proposed Annual Percentage Increase

CommonStockDividendsProposedAnnualPercentageIncrease

0.17

pure

CY2012

nrg

Comprehensive Income Loss Net Of Tax Available For Common Stockholders

ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders

62000000

USD

CY2013

nrg

Comprehensive Income Loss Net Of Tax Available For Common Stockholders

ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders

-240000000

USD

CY2014

nrg

Comprehensive Income Loss Net Of Tax Available For Common Stockholders

ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders

-121000000

USD

CY2012

nrg

Consent Fees Paid Preferred Stock

ConsentFeesPaidPreferredStock

0

USD

CY2013

nrg

Consent Fees Paid Preferred Stock

ConsentFeesPaidPreferredStock

0

USD

CY2014

nrg

Consent Fees Paid Preferred Stock

ConsentFeesPaidPreferredStock

5000000

USD

CY2012

nrg

Cost Of Services Energy Services Unbilled

CostOfServicesEnergyServicesUnbilled

97000000

USD

CY2013

nrg

Cost Of Services Energy Services Unbilled

CostOfServicesEnergyServicesUnbilled

90000000

USD

CY2014

nrg

Cost Of Services Energy Services Unbilled

CostOfServicesEnergyServicesUnbilled

86000000

USD

CY2014

nrg

Costs Incurred Asset Retirement Obligation Incurred For Acquisition

CostsIncurredAssetRetirementObligationIncurredForAcquisition

95000000

USD

CY2014

nrg

Counterparty Credit Risk Exposure Percentage Of Credit Risk Roll Off

CounterpartyCreditRiskExposurePercentageOfCreditRiskRollOff

0.91

pure

CY2014

nrg

Counterparty Credit Risk Exposure Percentage Threshold

CounterpartyCreditRiskExposurePercentageThreshold

0.10

pure

CY2014Q4

nrg

Credit Derivative Maximum Net Exposure Percentage

CreditDerivativeMaximumNetExposurePercentage

1.00

pure

CY2012

nrg

Decrease In Fixed Assets Accrued Grants

DecreaseInFixedAssetsAccruedGrants

-87000000

USD

CY2013

nrg

Decrease In Fixed Assets Accrued Grants

DecreaseInFixedAssetsAccruedGrants

-681000000

USD

CY2014

nrg

Decrease In Fixed Assets Accrued Grants

DecreaseInFixedAssetsAccruedGrants

-711000000

USD

CY2013Q4

nrg

Deferred Tax Assets Differences Between Book And Tax Basis Of Contracts

DeferredTaxAssetsDifferencesBetweenBookAndTaxBasisOfContracts

285000000

USD

CY2014Q4

nrg

Deferred Tax Assets Differences Between Book And Tax Basis Of Contracts

DeferredTaxAssetsDifferencesBetweenBookAndTaxBasisOfContracts

531000000

USD

CY2013Q4

nrg

Deferred Tax Assets Federal Benefit On State Unrecognized Tax Benefits

DeferredTaxAssetsFederalBenefitOnStateUnrecognizedTaxBenefits

23000000

USD

CY2014Q4

nrg

Deferred Tax Assets Federal Benefit On State Unrecognized Tax Benefits

DeferredTaxAssetsFederalBenefitOnStateUnrecognizedTaxBenefits

17000000

USD

CY2013Q4

nrg

Deferred Tax Assets Foreign Capital Loss Carryforwards

DeferredTaxAssetsForeignCapitalLossCarryforwards

1000000

USD

CY2014Q4

nrg

Deferred Tax Assets Foreign Capital Loss Carryforwards

DeferredTaxAssetsForeignCapitalLossCarryforwards

1000000

USD

CY2013Q4

nrg

Deferred Tax Assets Intangibles

DeferredTaxAssetsIntangibles

20000000

USD

CY2014Q4

nrg

Deferred Tax Assets Intangibles

DeferredTaxAssetsIntangibles

0

USD

CY2013Q4

nrg

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation Accrued Vacation And Other Reserves

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensationAccruedVacationAndOtherReserves

203000000

USD

CY2014Q4

nrg

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Deferred Compensation Accrued Vacation And Other Reserves

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensationAccruedVacationAndOtherReserves

266000000

USD

CY2013Q4

nrg

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits

168000000

USD

CY2014Q4

nrg

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits

157000000

USD

CY2013Q4

nrg

Deferred Tax Assets Tax Deferred Expenses Deferred Financing Costs

DeferredTaxAssetsTaxDeferredExpensesDeferredFinancingCosts

3000000

USD

CY2014Q4

nrg

Deferred Tax Assets Tax Deferred Expenses Deferred Financing Costs

DeferredTaxAssetsTaxDeferredExpensesDeferredFinancingCosts

23000000

USD

CY2013Q4

nrg

Deferred Tax Liabilities Emissions Allowances

DeferredTaxLiabilitiesEmissionsAllowances

15000000

USD

CY2014Q4

nrg

Deferred Tax Liabilities Emissions Allowances

DeferredTaxLiabilitiesEmissionsAllowances

25000000

USD

CY2013Q4

nrg

Deferredtaxassetnetbeforevaluationallowance

1400000000

USD

CY2014Q4

nrg

Deferredtaxassetnetbeforevaluationallowance

1500000000

USD

CY2013Q4

nrg

Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral

DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral

345000000

USD

CY2014Q4

nrg

Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral

DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral

368000000

USD

CY2014Q4

nrg

Derivative Asset Fair Value Determined Using Valuation Techniques Percentage

DerivativeAssetFairValueDeterminedUsingValuationTechniquesPercentage

0.11

pure

CY2013Q4

nrg

Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset

DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset

0

USD

CY2014Q4

nrg

Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset

DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset

0

USD

CY2013Q4

nrg

Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash

DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash

-44000000

USD

CY2014Q4

nrg

Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash

DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash

-45000000

USD

CY2014Q4

nrg

Derivative Liability Fair Value Determined Using Valuation Techniques Percentage

DerivativeLiabilityFairValueDeterminedUsingValuationTechniquesPercentage

0.09

pure

CY2014Q4

nrg

Derivative Net Liability Position Collateral Required Adequate Assurance Clauses

DerivativeNetLiabilityPositionCollateralRequiredAdequateAssuranceClauses

61000000

USD

CY2014Q4

nrg

Derivative Net Liability Position Collateral Required Contracts With Credit Rating Contingent Feature

DerivativeNetLiabilityPositionCollateralRequiredContractsWithCreditRatingContingentFeature

42000000

USD

CY2014Q4

nrg

Derivative Net Liability Position No Counterparty Collateral Call

DerivativeNetLiabilityPositionNoCounterpartyCollateralCall

30000000

USD

CY2012

nrg

Derivative Unrealized Gains On Open Positions Related To Trading Activity Net

DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet

46000000

USD

CY2013

nrg

Derivative Unrealized Gains On Open Positions Related To Trading Activity Net

DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet

7000000

USD

CY2014

nrg

Derivative Unrealized Gains On Open Positions Related To Trading Activity Net

DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet

45000000

USD

CY2012

nrg

Development Costs And Expenses

DevelopmentCostsAndExpenses

68000000

USD

CY2013

nrg

Development Costs And Expenses

DevelopmentCostsAndExpenses

84000000

USD

CY2014

nrg

Development Costs And Expenses

DevelopmentCostsAndExpenses

91000000

USD

CY2012

nrg

Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves

EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves

13000000

USD

CY2013

nrg

Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves

EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves

11000000

USD

CY2014

nrg

Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves

EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves

30000000

USD

CY2012

nrg

Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships

EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships

0

USD

CY2013

nrg

Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships

EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships

8000000

USD

CY2014

nrg

Effective Income Tax Rate Reconciliation Tax Expense Attributableto Partnerships

EffectiveIncomeTaxRateReconciliationTaxExpenseAttributabletoPartnerships

4000000

USD

CY2014

nrg

Employee Stock Purchase Plan Exercise Price As Percentage Of Fair Value

EmployeeStockPurchasePlanExercisePriceAsPercentageOfFairValue

0.85

pure

CY2014

nrg

Employee Stock Purchase Plan Maximum Percentage Of Compensation Eligible

EmployeeStockPurchasePlanMaximumPercentageOfCompensationEligible

0.10

pure

CY2014Q4

nrg

Environmental Capital Expenditures Estimated

EnvironmentalCapitalExpendituresEstimated

641000000

USD

CY2012

nrg

Equity In Earnings Of Consolidated Subsidiaries

EquityInEarningsOfConsolidatedSubsidiaries

0

USD

CY2013

nrg

Equity In Earnings Of Consolidated Subsidiaries

EquityInEarningsOfConsolidatedSubsidiaries

0

USD

CY2014

nrg

Equity In Earnings Of Consolidated Subsidiaries

EquityInEarningsOfConsolidatedSubsidiaries

0

USD

CY2014

nrg

Estimated Counterparty Credit Risk Exposure To Certain Counterparties

EstimatedCounterpartyCreditRiskExposureToCertainCounterparties

3400000000

USD

CY2014

nrg

Estimated Counterparty Credit Risk Exposure To Certain Counterparties Period

EstimatedCounterpartyCreditRiskExposureToCertainCounterpartiesPeriod

P5Y

CY2013

nrg

Fair Value Assets Measured On Recurring Basis Gain Loss Included In Earnings

FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInEarnings

1000000

USD

CY2014Q4

nrg

Fair Value Assets Measured On Recurring Basis Valuation Techniques Impact Of Credit Reserve To Fair Value

FairValueAssetsMeasuredOnRecurringBasisValuationTechniquesImpactOfCreditReserveToFairValue

-2000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Earnings

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings

-12000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Nuclear Decommissioning Obligations

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInNuclearDecommissioningObligations

10000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Other Comprehensive Income

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInOtherComprehensiveIncome

4000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Purchases

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityPurchases

16000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Sales

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySales

-3000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Into Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersIntoLevel3

6000000

USD

CY2013

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Out Of Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersOutOfLevel3

27000000

USD

CY2012Q4

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue

47000000

USD

CY2013Q4

nrg

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue

95000000

USD

CY2013Q4

nrg

Fair Valueof Gross Derivative Assets Liabilities Net

FairValueofGrossDerivativeAssetsLiabilitiesNet

389000000

USD

CY2014Q4

nrg

Fair Valueof Gross Derivative Assets Liabilities Net

FairValueofGrossDerivativeAssetsLiabilitiesNet

413000000

USD

CY2013

nrg

Finite Lived Intangible Assets Acquired During Period

FiniteLivedIntangibleAssetsAcquiredDuringPeriod

99000000

USD

CY2014

nrg

Finite Lived Intangible Assets Acquired During Period

FiniteLivedIntangibleAssetsAcquiredDuringPeriod

1541000000

USD

CY2013

nrg

Finite Lived Intangible Assets Other Changes

FiniteLivedIntangibleAssetsOtherChanges

2000000

USD

CY2014

nrg

Finite Lived Intangible Assets Other Changes

FiniteLivedIntangibleAssetsOtherChanges

6000000

USD

CY2013

nrg

Finite Lived Intangible Assets Purchases

FiniteLivedIntangibleAssetsPurchases

118000000

USD

CY2014

nrg

Finite Lived Intangible Assets Purchases

FiniteLivedIntangibleAssetsPurchases

182000000

USD

CY2013

nrg

Finite Lived Intangible Assets Usage

FiniteLivedIntangibleAssetsUsage

14000000

USD

CY2014

nrg

Finite Lived Intangible Assets Usage

FiniteLivedIntangibleAssetsUsage

-34000000

USD

CY2014

nrg

Finite Lived Intangible Assets Write Off Of Fully Amortized Intangible Assets

FiniteLivedIntangibleAssetsWriteOffOfFullyAmortizedIntangibleAssets

-843000000

USD

CY2014Q4

nrg

Forty Four Percent Maximum Assessment

FortyFourPercentMaximumAssessment

0.44

pure

CY2013Q4

nrg

Funds Deposited By Counterparties

FundsDepositedByCounterparties

63000000

USD

CY2014Q4

nrg

Funds Deposited By Counterparties

FundsDepositedByCounterparties

72000000

USD

CY2014

nrg

Future Taxable Income To Fully Realize Net Federal And State Unitary Deferred Tax Assets Before Expiration

FutureTaxableIncomeToFullyRealizeNetFederalAndStateUnitaryDeferredTaxAssetsBeforeExpiration

4300000000

USD

CY2012

nrg

Gains Losses On Extinguishment Of Debt Non Cash Portion

GainsLossesOnExtinguishmentOfDebtNonCashPortion

-9000000

USD

CY2013

nrg

Gains Losses On Extinguishment Of Debt Non Cash Portion

GainsLossesOnExtinguishmentOfDebtNonCashPortion

15000000

USD

CY2014

nrg

Gains Losses On Extinguishment Of Debt Non Cash Portion

GainsLossesOnExtinguishmentOfDebtNonCashPortion

-25000000

USD

CY2014Q4

nrg

Genon Ltip Shares Remaining

GenonLtipSharesRemaining

2150019

shares

CY2012

nrg

Gross Receipts Tax

GrossReceiptsTax

79000000

USD

CY2013

nrg

Gross Receipts Tax

GrossReceiptsTax

88000000

USD

CY2014

nrg

Gross Receipts Tax

GrossReceiptsTax

108000000

USD

CY2014Q4

nrg

Guarantee Maturity Between One To Three Years

GuaranteeMaturityBetweenOneToThreeYears

466000000

USD

CY2014Q4

nrg

Guarantee Maturity Between Three To Five Years

GuaranteeMaturityBetweenThreeToFiveYears

265000000

USD

CY2014Q4

nrg

Guarantee Maturity Greater Than Five Years

GuaranteeMaturityGreaterThanFiveYears

2575000000

USD

CY2014Q4

nrg

Guarantee Maturity Less Than One Year

GuaranteeMaturityLessThanOneYear

1854000000

USD

CY2013Q4

nrg

Guarantee Obligations Estimated Exposure

GuaranteeObligationsEstimatedExposure

4081000000

USD

CY2014Q4

nrg

Guarantee Obligations Estimated Exposure

GuaranteeObligationsEstimatedExposure

5160000000

USD

CY2012

nrg

Impairment Charges And Asset Write Downs

ImpairmentChargesAndAssetWriteDowns

0

USD

CY2013

nrg

Impairment Charges And Asset Write Downs

ImpairmentChargesAndAssetWriteDowns

-558000000

USD

CY2014

nrg

Impairment Charges And Asset Write Downs

ImpairmentChargesAndAssetWriteDowns

-97000000

USD

CY2012

nrg

Income Tax Reconciliation Bargain Purchase Gain

IncomeTaxReconciliationBargainPurchaseGain

-104000000

USD

CY2013

nrg

Income Tax Reconciliation Bargain Purchase Gain

IncomeTaxReconciliationBargainPurchaseGain

0

USD

CY2014

nrg

Income Tax Reconciliation Bargain Purchase Gain

IncomeTaxReconciliationBargainPurchaseGain

0

USD

CY2012

nrg

Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance

IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance

0

USD

CY2013

nrg

Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance

IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance

10000000

USD

CY2014

nrg

Income Tax Reconciliation Change In Capital Loss Carryforwards Valuation Allowance

IncomeTaxReconciliationChangeInCapitalLossCarryforwardsValuationAllowance

0

USD

CY2012

nrg

Income Tax Reconciliation Expiration Capital Losses

IncomeTaxReconciliationExpirationCapitalLosses

0

USD

CY2013

nrg

Income Tax Reconciliation Expiration Capital Losses

IncomeTaxReconciliationExpirationCapitalLosses

10000000

USD

CY2014

nrg

Income Tax Reconciliation Expiration Capital Losses

IncomeTaxReconciliationExpirationCapitalLosses

0

USD

CY2012

nrg

Income Tax Reconciliation Impact Of Non Taxible Equity Earning

IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning

-7000000

USD

CY2013

nrg

Income Tax Reconciliation Impact Of Non Taxible Equity Earning

IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning

-14000000

USD

CY2014

nrg

Income Tax Reconciliation Impact Of Non Taxible Equity Earning

IncomeTaxReconciliationImpactOfNonTaxibleEquityEarning

-11000000

USD

CY2014

nrg

Income Taxes Threshold Percentage

IncomeTaxesThresholdPercentage

0.5

pure

CY2012

nrg

Increase Decrease In Notes Receivable

IncreaseDecreaseInNotesReceivable

-24000000

USD

CY2013

nrg

Increase Decrease In Notes Receivable

IncreaseDecreaseInNotesReceivable

-11000000

USD

CY2014

nrg

Increase Decrease In Notes Receivable

IncreaseDecreaseInNotesReceivable

25000000

USD

CY2012

nrg

Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects

IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects

-164000000

USD

CY2013

nrg

Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects

IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects

26000000

USD

CY2014

nrg

Increase Decrease In Restricted Cash To Support Equity Requirements For Us Doe Funded Projects

IncreaseDecreaseInRestrictedCashToSupportEquityRequirementsForUSDoeFundedProjects

206000000

USD

CY2012

nrg

Increase Decrease In Treasury Stock Shares Loaned Returned

IncreaseDecreaseInTreasuryStockSharesLoanedReturned

0

USD

CY2013

nrg

Increase Decrease In Treasury Stock Shares Loaned Returned

IncreaseDecreaseInTreasuryStockSharesLoanedReturned

0

USD

CY2014

nrg

Increase Decrease In Treasury Stock Shares Loaned Returned

IncreaseDecreaseInTreasuryStockSharesLoanedReturned

-401000000

USD

CY2014Q4

nrg

Industry Mutual Insurance Company Multiplier

IndustryMutualInsuranceCompanyMultiplier

10

pure

CY2012

nrg

Inter Segment Sales

InterSegmentSales

1838000000

USD

CY2013

nrg

Inter Segment Sales

InterSegmentSales

2307000000

USD

CY2014

nrg

Inter Segment Sales

InterSegmentSales

1914000000

USD

CY2012

nrg

Intercompany Loans To Receipts From Subsidiaries

IntercompanyLoansToReceiptsFromSubsidiaries

0

USD

CY2013

nrg

Intercompany Loans To Receipts From Subsidiaries

IntercompanyLoansToReceiptsFromSubsidiaries

0

USD

CY2014

nrg

Intercompany Loans To Receipts From Subsidiaries

IntercompanyLoansToReceiptsFromSubsidiaries

0

USD

CY2013Q4

nrg

Interest Payable Other Accrued Liabilities And Other Liabilities Current

InterestPayableOtherAccruedLiabilitiesAndOtherLiabilitiesCurrent

998000000

USD

CY2012

nrg

Investments In Proceeds From Sales Of Unconsolidated Affiliates

InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates

-25000000

USD

CY2013

nrg

Investments In Proceeds From Sales Of Unconsolidated Affiliates

InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates

0

USD

CY2014

nrg

Investments In Proceeds From Sales Of Unconsolidated Affiliates

InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates

-103000000

USD

CY2014Q4

nrg

Longterm Debt Maturities Repaymentsof Principal

LongtermDebtMaturitiesRepaymentsofPrincipal

20132000000

USD

CY2014

nrg

Losson Extinguishmentof Preferred Stock

LossonExtinguishmentofPreferredStock

42000000

USD

CY2014

nrg

Maximum Remaining Termunder Individual Purchased Power Contract

MaximumRemainingTermunderIndividualPurchasedPowerContract

P5Y

CY2008

nrg

Minimum Civil Penalties Which May Be Assumed

MinimumCivilPenaltiesWhichMayBeAssumed

200000

USD

CY2014Q4

nrg

Mutual Lost Revenue Insurance Maximum Weekly Recovery

MutualLostRevenueInsuranceMaximumWeeklyRecovery

0

USD

CY2014Q4

nrg

Mutual Property Insurance Additional Blanket Policy Property Coverage

MutualPropertyInsuranceAdditionalBlanketPolicyPropertyCoverage

1000000000

USD

CY2014Q4

nrg

Mutual Property Insurance Individual Maximum Property Coverage Limit

MutualPropertyInsuranceIndividualMaximumPropertyCoverageLimit

1750000000

USD

CY2014Q4

nrg

Net Credit Exposure

NetCreditExposure

953000000

USD

CY2014

nrg

Noncashadjustmentforissuanceofconvertibledebt

23000000

USD

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Maximum Assessment

NuclearInsuranceFinancialProtectionPoolMaximumAssessment

127000000

USD

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Maximum Assessment Adminstrative Fee Asa Percent

NuclearInsuranceFinancialProtectionPoolMaximumAssessmentAdminstrativeFeeAsaPercent

0.05

pure

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Nuclear Operator Maximum Annual Assessment

NuclearInsuranceFinancialProtectionPoolNuclearOperatorMaximumAnnualAssessment

8000000

USD

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Nuclear Operator Total Assessment

NuclearInsuranceFinancialProtectionPoolNuclearOperatorTotalAssessment

112000000

USD

CY2013Q4

nrg

Nuclear Decommissioning Trust Fund Liability Noncurrent

NuclearDecommissioningTrustFundLiabilityNoncurrent

324000000

USD

CY2014Q4

nrg

Nuclear Decommissioning Trust Fund Liability Noncurrent

NuclearDecommissioningTrustFundLiabilityNoncurrent

333000000

USD

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Maximum Annual Assessment

NuclearInsuranceFinancialProtectionPoolMaximumAnnualAssessment

19000000

USD

CY2014

nrg

Number Of Years Board Of Directors Of Industry Mutual Insurance Company Can Adjust Policy After Policy Expires

NumberOfYearsBoardOfDirectorsOfIndustryMutualInsuranceCompanyCanAdjustPolicyAfterPolicyExpires

P6Y

CY2014Q4

nrg

Other Assets Noncurrent Emission Allowances

OtherAssetsNoncurrentEmissionAllowances

53000000

USD

CY2013Q4

nrg

Out Of Market Contracts

OutOfMarketContracts

1177000000

USD

CY2014Q4

nrg

Nuclear Insurance Financial Protection Pool Value

NuclearInsuranceFinancialProtectionPoolValue

13200000000

USD

CY2014Q4

nrg

Nuclear Insurance Per Incident Coverage Limit

NuclearInsurancePerIncidentCoverageLimit

13600000000

USD

CY2014Q4

nrg

Nuclear Insurance Requirement Per Site

NuclearInsuranceRequirementPerSite

375000000

USD

CY2012Q3

nrg

Number Of Pjm Transmission Owners Who Filed Motion

NumberOfPjmTransmissionOwnersWhoFiledMotion

3

CY2010Q2

nrg

Number Of Significant Orders Issued By Authority

NumberOfSignificantOrdersIssuedByAuthority

2

orders

CY2012

nrg

Operating Cost And Expense Excluding Depreciation Depletion And Amortization

OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization

6947000000

USD

CY2013

nrg

Operating Cost And Expense Excluding Depreciation Depletion And Amortization

OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization

9025000000

USD

CY2014

nrg

Operating Cost And Expense Excluding Depreciation Depletion And Amortization

OperatingCostAndExpenseExcludingDepreciationDepletionAndAmortization

12821000000

USD

CY2014Q4

nrg

Out Of Market Contracts

OutOfMarketContracts

1244000000

USD

CY2012

nrg

Payment Of Intercompany Dividends

PaymentOfIntercompanyDividends

0

USD

CY2012

nrg

Payments To Settle Acquired Derivatives That Include Financing Elements

PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements

68000000

USD

CY2013

nrg

Payments To Settle Acquired Derivatives That Include Financing Elements

PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements

-267000000

USD

CY2014

nrg

Payments To Settle Acquired Derivatives That Include Financing Elements

PaymentsToSettleAcquiredDerivativesThatIncludeFinancingElements

-9000000

USD

CY2014

nrg

Period Beyondwhich Comapny Can Not Predict Holdingof Collateral

PeriodBeyondwhichComapnyCanNotPredictHoldingofCollateral

P12M

CY2014Q4

nrg

Power Generation Capacity Megawatts

PowerGenerationCapacityMegawatts

52000

CY2012Q3

nrg

Power Generation Participation Megawatts

PowerGenerationParticipationMegawatts

400

CY2013Q4

nrg

Prepaid Expense And Other Assets Current Less Accounts Receivable Affiliate

PrepaidExpenseAndOtherAssetsCurrentLessAccountsReceivableAffiliate

471000000

USD

CY2014Q4

nrg

Prepaid Expense And Other Assets Current Less Accounts Receivable Affiliate

PrepaidExpenseAndOtherAssetsCurrentLessAccountsReceivableAffiliate

438000000

USD

CY2012

nrg

Proceeds From Payments To Intercompany Loans

ProceedsFromPaymentsToIntercompanyLoans

0

USD

CY2013

nrg

Proceeds From Payments To Intercompany Loans

ProceedsFromPaymentsToIntercompanyLoans

0

USD

CY2014

nrg

Proceeds From Payments To Intercompany Loans

ProceedsFromPaymentsToIntercompanyLoans

0

USD

CY2012

nrg

Proceeds From Renewable Energy Grants

ProceedsFromRenewableEnergyGrants

62000000

USD

CY2013

nrg

Proceeds From Renewable Energy Grants

ProceedsFromRenewableEnergyGrants

55000000

USD

CY2014

nrg

Proceeds From Renewable Energy Grants

ProceedsFromRenewableEnergyGrants

916000000

USD

CY2013Q4

nrg

Property Plant And Equipment In Service

PropertyPlantAndEquipmentInService

23649000000

USD

CY2014Q4

nrg

Property Plant And Equipment In Service

PropertyPlantAndEquipmentInService

29487000000

USD

CY2014

nrg

Redeemable Noncontrolling Increasefrom Saleof Parent Equity Interest

RedeemableNoncontrollingIncreasefromSaleofParentEquityInterest

36000000

USD

CY2014Q4

nrg

Redeemable Preferred Stock Fair Value

RedeemablePreferredStockFairValue

291000000

USD

CY2011Q4

nrg

Regulatory Charges Owed By Third Party

RegulatoryChargesOwedByThirdParty

22000000

USD

CY2012Q3

nrg

Regulatory Charges Settled By Third Party

RegulatoryChargesSettledByThirdParty

24000000

USD

CY2012Q3

nrg

Regulatory Charges Settled By Third Party Additional

RegulatoryChargesSettledByThirdPartyAdditional

1000000

USD

CY2012

nrg

Revenues From Resale Of Purchased Power

RevenuesFromResaleOfPurchasedPower

151000000

USD

CY2013

nrg

Revenues From Resale Of Purchased Power

RevenuesFromResaleOfPurchasedPower

166000000

USD

CY2014

nrg

Revenues From Resale Of Purchased Power

RevenuesFromResaleOfPurchasedPower

387000000

USD

CY2012

nrg

Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity

ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity

0

USD

CY2013

nrg

Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity

ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity

0

USD

CY2014

nrg

Reversal Of Previously Unrecognized Unrealized Gain Loss Acquired As Part Of Acquisition Trading Activity

ReversalOfPreviouslyUnrecognizedUnrealizedGainLossAcquiredAsPartOfAcquisitionTradingActivity

-32000000

USD

CY2012

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges

-20000000

USD

CY2013

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges

357000000

USD

CY2014

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Acquired As Part Of Acquisition Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesAcquiredAsPartOfAcquisitionEconomicHedges

333000000

USD

CY2012

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges

247000000

USD

CY2013

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges

105000000

USD

CY2014

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Economic Hedges

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges

15000000

USD

CY2012

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity

60000000

USD

CY2013

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity

50000000

USD

CY2014

nrg

Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity

ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity

-1000000

USD

CY2014

nrg

Share Based Compensation Arrangement By Share Based Payment Award Number Of Types Of Awards

ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfAwards

5

TypesOfAwards

CY2014Q4

nrg

Shares Authorized For Issuance Under Genon Ltip

SharesAuthorizedForIssuanceUnderGenonLtip

5558390

shares

CY2014Q4

nrg

Steam And Chilled Water Capacity Megawatts Thermal Equivalent

SteamAndChilledWaterCapacityMegawattsThermalEquivalent

1444

CY2013Q4

nrg

Temporary Equity Liquidation Value

TemporaryEquityLiquidationValue

250

USD

CY2014Q4

nrg

Temporary Equity Liquidation Value

TemporaryEquityLiquidationValue

250

USD

CY2013Q4

nrg

Total Other Assets

TotalOtherAssets

6455000000

USD

CY2014Q4

nrg

Total Other Assets

TotalOtherAssets

9716000000

USD

CY2014

nrg

Twenty Four Months

TwentyFourMonths

P24M

CY2012

nrg

Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities

UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities

-268000000

USD

CY2013

nrg

Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities

UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities

-285000000

USD

CY2014

nrg

Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities

UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities

13000000

USD

CY2012

nrg

Unrealized Gain Loss On Derivatives Mark To Market Trading Activites

UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites

-14000000

USD

CY2013

nrg

Unrealized Gain Loss On Derivatives Mark To Market Trading Activites

UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites

-43000000

USD

CY2014

nrg

Unrealized Gain Loss On Derivatives Mark To Market Trading Activites

UnrealizedGainLossOnDerivativesMarkToMarketTradingActivites

14000000

USD

CY2013Q4

us-gaap

Accounts Payable Current

AccountsPayableCurrent

1038000000

USD

CY2014Q4

us-gaap

Accounts Payable Current

AccountsPayableCurrent

1060000000

USD

CY2013Q4

us-gaap

Accounts Receivable Net Current

AccountsReceivableNetCurrent

1214000000

USD

CY2014Q4

us-gaap

Accounts Receivable Net Current

AccountsReceivableNetCurrent

1322000000

USD

CY2014Q4

us-gaap

Accrued Income Taxes Current

AccruedIncomeTaxesCurrent

16000000

USD

CY2013Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

6573000000

USD

CY2014Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

7890000000

USD

CY2011Q4

us-gaap

Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax

AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

132000000

USD

CY2012Q4

us-gaap

Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax

AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

-31000000

USD

CY2013Q4

us-gaap

Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax

AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

-23000000

USD

CY2014Q4

us-gaap

Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax

AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

-68000000

USD

CY2012Q4

us-gaap

Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax

AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

53000000

USD

CY2013Q4

us-gaap

Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax

AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

15000000

USD

CY2014Q4

us-gaap

Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax

AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

1000000

USD

CY2013Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

5000000

USD

CY2014Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-174000000

USD

CY2013Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

7840000000

USD

CY2014Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

8327000000

USD

CY2014Q1

us-gaap

Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt

AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt

23000000

USD

CY2012

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

34000000

USD

CY2013

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

36000000

USD

CY2014

us-gaap

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

45000000

USD

CY2012

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

40000000

USD

CY2013

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

40000000

USD

CY2014

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

42000000

USD

CY2013Q4

us-gaap

Allowance For Doubtful Accounts Receivable Current

AllowanceForDoubtfulAccountsReceivableCurrent

40000000

USD

CY2014Q4

us-gaap

Allowance For Doubtful Accounts Receivable Current

AllowanceForDoubtfulAccountsReceivableCurrent

23000000

USD

CY2012

us-gaap

Amortization Of Financing Costs And Discounts

AmortizationOfFinancingCostsAndDiscounts

31000000

USD

CY2013

us-gaap

Amortization Of Financing Costs And Discounts

AmortizationOfFinancingCostsAndDiscounts

-33000000

USD

CY2014

us-gaap

Amortization Of Financing Costs And Discounts

AmortizationOfFinancingCostsAndDiscounts

-12000000

USD

CY2012

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

310000000

USD

CY2013

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

279000000

USD

CY2014

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

17000000

shares

CY2014

us-gaap

Asset Impairment Charges

AssetImpairmentCharges

97000000

USD

CY2013Q4

us-gaap

Asset Retirement Obligation

AssetRetirementObligation

629000000

USD

CY2014

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

268000000

USD

CY2014Q4

us-gaap

Amount Of Restricted Net Assets For Consolidated And Unconsolidated Subsidiaries

AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries

5200000000

USD

CY2012

us-gaap

Asset Impairment Charges

AssetImpairmentCharges

0

USD

CY2013

us-gaap

Asset Impairment Charges

AssetImpairmentCharges

459000000

USD

CY2012

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

24000000

shares

CY2013

us-gaap

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

25000000

shares

CY2014Q4

us-gaap

Asset Retirement Obligation

AssetRetirementObligation

763000000

USD

CY2014

us-gaap

Asset Retirement Obligation Accretion Expense

AssetRetirementObligationAccretionExpense

23000000

USD

CY2014

us-gaap

Asset Retirement Obligation Liabilities Settled

AssetRetirementObligationLiabilitiesSettled

-7000000

USD

CY2014

us-gaap

Asset Retirement Obligation Revision Of Estimate

AssetRetirementObligationRevisionOfEstimate

-8000000

USD

CY2013Q4

us-gaap

Assets

33902000000

USD

CY2014Q4

us-gaap

Assets

40665000000

USD

CY2013Q4

us-gaap

Assets Current

AssetsCurrent

7596000000

USD

CY2014Q4

us-gaap

Assets Current

AssetsCurrent

8582000000

USD

CY2013Q4

us-gaap

Assets Noncurrent

AssetsNoncurrent

6455000000

USD

CY2014Q4

us-gaap

Assets Noncurrent

AssetsNoncurrent

9716000000

USD

CY2012

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

12000000

USD

CY2013

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

25000000

USD

CY2014

us-gaap

Available For Sale Securities Gross Realized Gains

AvailableForSaleSecuritiesGrossRealizedGains

29000000

USD

CY2012

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

7000000

USD

CY2013

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

8000000

USD

CY2014

us-gaap

Available For Sale Securities Gross Realized Losses

AvailableForSaleSecuritiesGrossRealizedLosses

8000000

USD

CY2013

us-gaap

Available For Sale Securities Gross Unrealized Gains

AvailableForSaleSecuritiesGrossUnrealizedGains

207000000

USD

CY2014

us-gaap

Available For Sale Securities Gross Unrealized Gains

AvailableForSaleSecuritiesGrossUnrealizedGains

218000000

USD

CY2013

us-gaap

Available For Sale Securities Gross Unrealized Loss

AvailableForSaleSecuritiesGrossUnrealizedLoss

3000000

USD

CY2014

us-gaap

Available For Sale Securities Gross Unrealized Loss

AvailableForSaleSecuritiesGrossUnrealizedLoss

2000000

USD

CY2013Q4

us-gaap

Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount

BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount

573000000

USD

CY2014Q4

us-gaap

Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount

BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount

831000000

USD

CY2012

us-gaap

Business Combination Acquisition Related Costs

BusinessCombinationAcquisitionRelatedCosts

107000000

USD

CY2013

us-gaap

Business Combination Acquisition Related Costs

BusinessCombinationAcquisitionRelatedCosts

128000000

USD

CY2014

us-gaap

Business Combination Acquisition Related Costs

BusinessCombinationAcquisitionRelatedCosts

84000000

USD

CY2012

us-gaap

Business Combination Bargain Purchase Gain Recognized Amount

BusinessCombinationBargainPurchaseGainRecognizedAmount

296000000

USD

CY2013

us-gaap

Business Combination Bargain Purchase Gain Recognized Amount

BusinessCombinationBargainPurchaseGainRecognizedAmount

0

USD

CY2014

us-gaap

Business Combination Bargain Purchase Gain Recognized Amount

BusinessCombinationBargainPurchaseGainRecognizedAmount

0

USD

CY2012Q4

us-gaap

Business Combination Consideration Transferred Equity Interests Issued And Issuable

BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

28000000

USD

CY2013

us-gaap

Business Combination Integration Related Costs

BusinessCombinationIntegrationRelatedCosts

128000000

USD

CY2014

us-gaap

Business Combination Integration Related Costs

BusinessCombinationIntegrationRelatedCosts

84000000

USD

CY2012

us-gaap

Capital Expenditures Incurred But Not Yet Paid

CapitalExpendituresIncurredButNotYetPaid

563000000

USD

CY2013

us-gaap

Capital Expenditures Incurred But Not Yet Paid

CapitalExpendituresIncurredButNotYetPaid

405000000

USD

CY2014

us-gaap

Capital Expenditures Incurred But Not Yet Paid

CapitalExpendituresIncurredButNotYetPaid

87000000

USD

CY2012

us-gaap

Cash Acquired From Acquisition

CashAcquiredFromAcquisition

983000000

USD

CY2013

us-gaap

Cash Acquired From Acquisition

CashAcquiredFromAcquisition

0

USD

CY2014

us-gaap

Cash Acquired From Acquisition

CashAcquiredFromAcquisition

0

USD

CY2011Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

1105000000

USD

CY2012Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2087000000

USD

CY2013Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2254000000

USD

CY2014Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

2116000000

USD

CY2012

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

982000000

USD

CY2013

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

167000000

USD

CY2014

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-138000000

USD

CY2014

us-gaap

Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months

CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

-15000000

USD

CY2014Q4

us-gaap

Common Stock Capital Shares Reserved For Future Issuance

CommonStockCapitalSharesReservedForFutureIssuance

35413743

shares

CY2012Q3

us-gaap

Common Stock Dividends Per Share Cash Paid