$NRG
NRG Energy Inc Stock $nrg

$nrg Overview Financials Valuation SEC Filings Company Website

2018 Form 10-K Financial Statement

#000101387119000007 Filed on February 28, 2019

Income Statement

Concept	2018	2017 Q4	2017 Q3
Revenue	$9.478B	$2.154B	$2.618B
YoY Change	4.45%	-1.37%	-23.47%
Cost Of Revenue	$7.108B	$1.297B	$2.072B
YoY Change	3.22%	-18.43%	-15.08%
Gross Profit	$2.370B	$531.0M	$546.0M
YoY Change	8.32%	-10.61%	-44.34%
Gross Profit Margin	25.01%	24.65%	20.86%
Selling, General & Admin	$799.0M	$202.0M	$190.0M
YoY Change	-4.43%	-31.29%	-31.41%
% of Gross Profit	33.71%	38.04%	34.8%
Research & Development	$11.00M	$4.000M	$6.000M
YoY Change	-50.0%	-83.33%	-71.43%
% of Gross Profit	0.46%	0.75%	1.1%
Depreciation & Amortization	$421.0M	$95.00M	$163.0M
YoY Change	-29.36%	-75.77%	-45.3%
% of Gross Profit	17.76%	17.89%	29.85%
Operating Expenses	$810.0M	$312.0M	$196.0M
YoY Change	-5.59%	-49.27%	-34.23%
Operating Profit	$982.0M	-$1.200B	$275.0M
YoY Change	-232.52%	82.37%	-35.9%
Interest Expense	$483.0M	-$119.0M	$139.0M
YoY Change	-13.29%	-26.99%	-41.35%
% of Operating Profit	49.19%		50.55%
Other Income/Expense, Net	-$515.0M	$8.000M	-$111.0M
YoY Change	-20.52%	60.0%	-59.19%
Pretax Income	$467.0M	-$1.508B	$186.0M
YoY Change	-133.62%	56.92%	19.23%
Income Tax	$7.000M	-$47.00M	$1.000M
% Of Pretax Income	1.5%		0.54%
Net Earnings	$268.0M	-$1.535B	$171.0M
YoY Change	-112.45%	55.52%	-57.46%
Net Earnings / Revenue	2.83%	-71.26%	6.53%
Basic Earnings Per Share	$0.88	-$4.84	$0.54
Diluted Earnings Per Share	$0.87	-$4.84	$0.53
COMMON SHARES
Basic Shares Outstanding	304.0M shares	317.0M shares	317.0M shares
Diluted Shares Outstanding	308.0M shares	317.0M shares	322.0M shares

Balance Sheet

Concept	2018	2017 Q4	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$563.0M	$767.0M	$1.223B
YoY Change	-26.6%	-18.23%	-49.77%
Cash & Equivalents	$563.0M	$770.0M	$1.022B
Short-Term Investments
Other Short-Term Assets	$1.601B	$2.111B	$1.633B
YoY Change	-24.16%	-47.19%	-24.61%
Inventory	$412.0M	$453.0M	$630.0M
Prepaid Expenses
Receivables	$1.024B	$900.0M	$1.274B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.600B	$4.437B	$4.760B
YoY Change	-20.18%	-33.91%	-32.14%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.048B	$5.974B	$15.33B
YoY Change	-52.63%	-61.13%	-15.77%
Goodwill		$539.0M	$662.0M
YoY Change		-18.58%	-33.73%
Intangibles
YoY Change
Long-Term Investments	$412.0M	$182.0M	$1.138B
YoY Change	126.37%	-83.75%	26.44%
Other Assets	$2.404B	$310.0M	$644.0M
YoY Change	-78.87%	-63.14%	-46.24%
Total Long-Term Assets	$7.028B	$12.94B	$5.378B
YoY Change	-63.09%	50.53%	-14.28%
TOTAL ASSETS
Total Short-Term Assets	$3.600B	$4.437B	$4.760B
Total Long-Term Assets	$7.028B	$12.94B	$5.378B
Total Assets	$10.63B	$23.36B	$25.47B
YoY Change	-54.87%	-23.88%	-19.12%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$863.0M	$684.0M	$915.0M
YoY Change	12.37%	-12.53%	-3.17%
Accrued Expenses	$680.0M	$930.0M	$994.0M
YoY Change	-26.88%	-6.06%	-13.57%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$72.00M	$204.0M	$1.247B
YoY Change	-64.71%	-60.47%	2.13%
Total Short-Term Liabilities	$2.398B	$3.354B	$3.705B
YoY Change	-29.72%	-28.67%	-13.86%
LONG-TERM LIABILITIES
Long-Term Debt	$6.449B	$9.180B	$15.66B
YoY Change	-29.75%	-42.47%	-13.1%
Other Long-Term Liabilities	$2.931B	$534.0M	$1.116B
YoY Change	-67.03%	-19.82%	-24.59%
Total Long-Term Liabilities	$9.380B	$17.96B	$17.99B
YoY Change	-48.09%	-16.44%	-17.01%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.398B	$3.354B	$3.705B
Total Long-Term Liabilities	$9.380B	$17.96B	$17.99B
Total Liabilities	$11.86B	$21.31B	$21.70B
YoY Change	-50.36%	-18.64%	-16.49%
SHAREHOLDERS EQUITY
Retained Earnings		-$6.268B	-$4.713B
YoY Change		65.51%	68.86%
Common Stock		$8.380B	$8.373B
YoY Change		0.22%	-0.01%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$2.386B	$2.386B
YoY Change		-0.54%	-0.54%
Treasury Stock Shares		101.6M shares	101.6M shares
Shareholders Equity	-$1.234B	-$346.0M	$1.183B
YoY Change
Total Liabilities & Shareholders Equity	$10.63B	$23.36B	$25.47B
YoY Change	-54.87%	-23.88%	-19.12%

Cashflow Statement

Concept	2018	2017 Q4	2017 Q3
OPERATING ACTIVITIES
Net Income	$268.0M	-$1.535B	$171.0M
YoY Change	-112.45%	55.52%	-57.46%
Depreciation, Depletion And Amortization	$421.0M	$95.00M	$163.0M
YoY Change	-29.36%	-75.77%	-45.3%
Cash From Operating Activities	$1.377B	$847.0M	$768.0M
YoY Change	-14.47%	56.56%	98.96%
INVESTING ACTIVITIES
Capital Expenditures	$388.0M	-$82.00M	$370.0M
YoY Change	52.76%	-74.13%	-270.51%
Acquisitions	$243.0M
YoY Change	1635.71%
Other Investing Activities	$6.000M	-$135.0M	-$247.0M
YoY Change	-120.0%	-38.64%	-157.18%
Cash From Investing Activities	-$205.0M	-$217.0M	$123.0M
YoY Change	-67.92%	-59.59%	-42.79%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$1.229B
YoY Change	61350.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$1.526B	-924.0M	-232.0M
YoY Change	34.09%	181.71%	307.02%
NET CHANGE
Cash From Operating Activities	$1.377B	847.0M	768.0M
Cash From Investing Activities	-$205.0M	-217.0M	123.0M
Cash From Financing Activities	-$1.526B	-924.0M	-232.0M
Net Change In Cash	-$473.0M	-294.0M	659.0M
YoY Change	-309.29%	-9.26%	21.14%
FREE CASH FLOW
Cash From Operating Activities	$1.377B	$847.0M	$768.0M
Capital Expenditures	$388.0M	-$82.00M	$370.0M
Free Cash Flow	$989.0M	$929.0M	$398.0M
YoY Change	-27.06%	8.28%	-34.0%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001013871
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	280997550	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	7964294696	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	NRG ENERGY, INC.
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2017	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	-88000000	USD
CY2017Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	-8000000	USD
CY2018	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	-166000000	USD
CY2016	nrg	Accrued Expenses And Other Current Liabilities Operating AccruedExpensesAndOtherCurrentLiabilitiesOperating	-61000000	USD
CY2018Q4	nrg	Accumulated Amortizationof Outof Market Contracts AccumulatedAmortizationofOutofMarketContracts	37000000	USD
CY2016Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	-16000000	USD
CY2018Q4	nrg	Accumulated Other Comprehensive Income Loss Cumulative Change In Gain Loss From Cash Flow Hedges Tax Amount AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount	0	USD
CY2018Q4	nrg	Additional Mutual Lost Revenue Insurance Weekly Maximum AdditionalMutualLostRevenueInsuranceWeeklyMaximum	1980000	USD
CY2016	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	68000000	USD
CY2017	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	54000000	USD
CY2018	nrg	Amortization Of Intangibles And Out Of Market Contracts AmortizationOfIntangiblesAndOutOfMarketContracts	45000000	USD
CY2016	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	49000000	USD
CY2017	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	51000000	USD
CY2018	nrg	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	48000000	USD
CY2018Q4	nrg	Amount Of Credit Exposure To Significant Portion Of All Counterparties AmountOfCreditExposureToSignificantPortionOfAllCounterparties	301000000	USD
CY2018	nrg	Asset Retirement Obligation Accretion Nuclear Decommissioning AssetRetirementObligationAccretionNuclearDecommissioning	15000000	USD
CY2017Q4	nrg	Capital Expenditures CapitalExpenditures	250000000	USD
CY2018Q4	nrg	Capital Expenditures CapitalExpenditures	388000000	USD
CY2016	nrg	Changes In Collateral Deposits Supporting Energy Risk Management Activities ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities	396000000	USD
CY2017	nrg	Changes In Collateral Deposits Supporting Energy Risk Management Activities ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities	-80000000	USD
CY2018	nrg	Changes In Collateral Deposits Supporting Energy Risk Management Activities ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities	-105000000	USD
CY2016	nrg	Changes In Derivatives ChangesInDerivatives	16000000	USD
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CY2018	nrg	Changes In Derivatives ChangesInDerivatives	37000000	USD
CY2016	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	41000000	USD
CY2017	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	11000000	USD
CY2018	nrg	Changes In Nuclear Decommissioning Trust Liability ChangesInNuclearDecommissioningTrustLiability	60000000	USD
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CY2016Q4	nrg	Collateralreceivedfrom Gen On CollateralreceivedfromGenOn	79000000	USD
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CY2016Q4	nrg	Common Stock Dividends Proposed Annual Percentage Decrease CommonStockDividendsProposedAnnualPercentageDecrease	0.79	pure
CY2016	nrg	Comprehensive Income Loss Net Of Tax Available For Common Stockholders ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders	-663000000	USD
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CY2018	nrg	Comprehensive Income Loss Net Of Tax Available For Common Stockholders ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders	232000000	USD
CY2016	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	90000000	USD
CY2017	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	107000000	USD
CY2018	nrg	Cost Of Services Energy Services Unbilled CostOfServicesEnergyServicesUnbilled	105000000	USD
CY2016	nrg	Costofrevenueincludingsellingmarketingandgeneraladministrative Costofrevenueincludingsellingmarketingandgeneraladministrative	7708000000	USD
CY2017	nrg	Costofrevenueincludingsellingmarketingandgeneraladministrative Costofrevenueincludingsellingmarketingandgeneraladministrative	7766000000	USD
CY2018	nrg	Costofrevenueincludingsellingmarketingandgeneraladministrative Costofrevenueincludingsellingmarketingandgeneraladministrative	7997000000	USD
CY2018	nrg	Counterparty Credit Risk Exposure Percentage Of Credit Risk Roll Off CounterpartyCreditRiskExposurePercentageOfCreditRiskRollOff	0.66	pure
CY2018	nrg	Counterparty Credit Risk Exposure Percentage Threshold CounterpartyCreditRiskExposurePercentageThreshold	0.10	pure
CY2018Q4	nrg	Credit Derivative Maximum Net Exposure Percentage CreditDerivativeMaximumNetExposurePercentage	1.00	pure
CY2018Q4	nrg	Credit Derivative Maximum Net Exposure Percentage CreditDerivativeMaximumNetExposurePercentage	1	pure
CY2017	nrg	Decommissioning Fund Investments Unrealized Gains DecommissioningFundInvestmentsUnrealizedGains	276000000	USD
CY2018	nrg	Decommissioning Fund Investments Unrealized Gains DecommissioningFundInvestmentsUnrealizedGains	234000000	USD
CY2017	nrg	Decommissioning Fund Investments Unrealized Loss DecommissioningFundInvestmentsUnrealizedLoss	2000000	USD
CY2018	nrg	Decommissioning Fund Investments Unrealized Loss DecommissioningFundInvestmentsUnrealizedLoss	6000000	USD
CY2017Q4	nrg	Deferred Tax Assets Differences Between Book And Tax Basis Of Contracts DeferredTaxAssetsDifferencesBetweenBookAndTaxBasisOfContracts	52000000	USD
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CY2017Q4	nrg	Deferred Tax Assets Federal Benefit On State Unrecognized Tax Benefits DeferredTaxAssetsFederalBenefitOnStateUnrecognizedTaxBenefits	7000000	USD
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CY2017Q4	nrg	Deferred Tax Assets Foreign Capital Loss Carryforwards DeferredTaxAssetsForeignCapitalLossCarryforwards	1000000	USD
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CY2018	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	-1000000	USD
CY2018Q4	nrg	Deferred Tax Assets Tax Deferred Expenses Deferred Financing Costs DeferredTaxAssetsTaxDeferredExpensesDeferredFinancingCosts	-21000000	USD
CY2017Q4	nrg	Deferred Tax Liabilities Emissions Allowances DeferredTaxLiabilitiesEmissionsAllowances	15000000	USD
CY2018Q4	nrg	Deferred Tax Liabilities Emissions Allowances DeferredTaxLiabilitiesEmissionsAllowances	15000000	USD
CY2017Q4	nrg	Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral	164000000	USD
CY2018Q4	nrg	Derivative Asset Fair Value Amount Offset Against Collateral Net Of Derivative Liability Fair Value Amount Offset Against Collateral DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral	187000000	USD
CY2018Q4	nrg	Derivative Asset Fair Value Determined Using Valuation Techniques Percentage DerivativeAssetFairValueDeterminedUsingValuationTechniquesPercentage	0.10	pure
CY2017Q4	nrg	Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset	0	USD
CY2018Q4	nrg	Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset	0	USD
CY2017Q4	nrg	Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash	61000000	USD
CY2018Q4	nrg	Derivative Collateral Obligation To Return Cash Net Of Derivative Collateral Right To Reclaim Cash DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash	83000000	USD
CY2018Q4	nrg	Derivative Liability Fair Value Determined Using Valuation Techniques Percentage DerivativeLiabilityFairValueDeterminedUsingValuationTechniquesPercentage	0.09	pure
CY2016	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	18000000	USD
CY2017	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	14000000	USD
CY2018	nrg	Derivative Unrealized Gains On Open Positions Related To Trading Activity Net DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet	29000000	USD
CY2017Q4	nrg	Disposal Groups Including Discontinue Operations Deferred Tax Assets Valuation Allowance DisposalGroupsIncludingDiscontinueOperationsDeferredTaxAssetsValuationAllowance	8000000	USD
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CY2016	nrg	Effective Income Tax Rate Reconciliation Amt Refundable Credit EffectiveIncomeTaxRateReconciliationAMTRefundableCredit	0	USD
CY2017	nrg	Effective Income Tax Rate Reconciliation Amt Refundable Credit EffectiveIncomeTaxRateReconciliationAMTRefundableCredit	64000000	USD
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CY2016	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	-2000000	USD
CY2017	nrg	Effective Income Tax Rate Reconciliation Reversal Of Uncertain Tax Positions Reserves EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionsReserves	5000000	USD
CY2018	nrg	Employee Stock Purchase Plan Exercise Price As Percentage Of Fair Value EmployeeStockPurchasePlanExercisePriceAsPercentageOfFairValue	0.85	pure
CY2018	nrg	Employee Stock Purchase Plan Maximum Percentage Of Compensation Eligible EmployeeStockPurchasePlanMaximumPercentageOfCompensationEligible	0.10	pure
CY2016	nrg	Equity In Earnings Of Consolidated Subsidiaries EquityInEarningsOfConsolidatedSubsidiaries	0	USD
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CY2018	nrg	Estimated Counterparty Credit Risk Exposure To Certain Counterparties EstimatedCounterpartyCreditRiskExposureToCertainCounterparties	434000000	USD
CY2018	nrg	Estimated Counterparty Credit Risk Exposure To Certain Counterparties Period EstimatedCounterpartyCreditRiskExposureToCertainCounterpartiesPeriod	P5Y
CY2017Q4	nrg	Fair Valueof Gross Derivative Assets Liabilities Net FairValueofGrossDerivativeAssetsLiabilitiesNet	103000000	USD
CY2018Q4	nrg	Fair Valueof Gross Derivative Assets Liabilities Net FairValueofGrossDerivativeAssetsLiabilitiesNet	104000000	USD
CY2017	nrg	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	-24000000	USD
CY2018	nrg	Finite Lived Intangible Assets Other Changes FiniteLivedIntangibleAssetsOtherChanges	-16000000	USD
CY2017	nrg	Finite Lived Intangible Assets Purchases FiniteLivedIntangibleAssetsPurchases	59000000	USD
CY2018	nrg	Finite Lived Intangible Assets Purchases FiniteLivedIntangibleAssetsPurchases	61000000	USD
CY2017	nrg	Finite Lived Intangible Assets Usage FiniteLivedIntangibleAssetsUsage	38000000	USD
CY2018	nrg	Finite Lived Intangible Assets Usage FiniteLivedIntangibleAssetsUsage	27000000	USD
CY2017	nrg	Finite Lived Intangible Assets Write Off Of Fully Amortized Intangible Assets FiniteLivedIntangibleAssetsWriteOffOfFullyAmortizedIntangibleAssets	77000000	USD
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CY2018Q4	nrg	Forty Four Percent Maximum Assessment FortyFourPercentMaximumAssessment	0.44	pure
CY2016Q4	nrg	Funds Deposited By Counterparties FundsDepositedByCounterparties	2000000	USD
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CY2016	nrg	Gainon Redemptionof Redeemable Preferred Stock GainonRedemptionofRedeemablePreferredStock	78000000	USD
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CY2016	nrg	Gains Losses On Extinguishment Of Debt Non Cash Portion GainsLossesOnExtinguishmentOfDebtNonCashPortion	-142000000	USD
CY2017	nrg	Gains Losses On Extinguishment Of Debt Non Cash Portion GainsLossesOnExtinguishmentOfDebtNonCashPortion	-49000000	USD
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CY2016	nrg	Gross Receipts Tax GrossReceiptsTax	101000000	USD
CY2017	nrg	Gross Receipts Tax GrossReceiptsTax	92000000	USD
CY2018	nrg	Gross Receipts Tax GrossReceiptsTax	99000000	USD
CY2018Q4	nrg	Guarantee Maturity Between One To Three Years GuaranteeMaturityBetweenOneToThreeYears	188000000	USD
CY2018Q4	nrg	Guarantee Maturity Between Three To Five Years GuaranteeMaturityBetweenThreeToFiveYears	257000000	USD
CY2018Q4	nrg	Guarantee Maturity Greater Than Five Years GuaranteeMaturityGreaterThanFiveYears	1184000000	USD
CY2018Q4	nrg	Guarantee Maturity Less Than One Year GuaranteeMaturityLessThanOneYear	1138000000	USD
CY2017Q4	nrg	Guarantee Obligations Estimated Exposure GuaranteeObligationsEstimatedExposure	1960000000	USD
CY2018Q4	nrg	Guarantee Obligations Estimated Exposure GuaranteeObligationsEstimatedExposure	2767000000	USD
CY2016	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	-751000000	USD
CY2017	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	-1614000000	USD
CY2018	nrg	Impairment Charges And Asset Write Downs ImpairmentChargesAndAssetWriteDowns	-114000000	USD
CY2016	nrg	Impairment Losses ImpairmentLosses	751000000	USD
CY2017	nrg	Impairment Losses ImpairmentLosses	1614000000	USD
CY2018	nrg	Impairment Losses ImpairmentLosses	114000000	USD
CY2016	nrg	Income Loss From Discontinued Operations Including Adjustment For Discontinued Operations Noncontrolling Interest Net Of Tax Attributable To Parent IncomeLossFromDiscontinuedOperationsIncludingAdjustmentForDiscontinuedOperationsNoncontrollingInterestNetOfTaxAttributableToParent	-41000000	USD
CY2017	nrg	Income Loss From Discontinued Operations Including Adjustment For Discontinued Operations Noncontrolling Interest Net Of Tax Attributable To Parent IncomeLossFromDiscontinuedOperationsIncludingAdjustmentForDiscontinuedOperationsNoncontrollingInterestNetOfTaxAttributableToParent	-1176000000	USD
CY2018	nrg	Income Loss From Discontinued Operations Including Adjustment For Discontinued Operations Noncontrolling Interest Net Of Tax Attributable To Parent IncomeLossFromDiscontinuedOperationsIncludingAdjustmentForDiscontinuedOperationsNoncontrollingInterestNetOfTaxAttributableToParent	-197000000	USD
CY2016	nrg	Income Lossfrom Equity Method Investmentof Unconsolidated Affiliates IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates	-67000000	USD
CY2017	nrg	Income Lossfrom Equity Method Investmentof Unconsolidated Affiliates IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates	-102000000	USD
CY2018	nrg	Income Lossfrom Equity Method Investmentof Unconsolidated Affiliates IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates	-46000000	USD
CY2016	nrg	Income Tax Reconciliation Impact Of Non Taxable Equity Earning IncomeTaxReconciliationImpactOfNonTaxableEquityEarning	22000000	USD
CY2017	nrg	Income Tax Reconciliation Impact Of Non Taxable Equity Earning IncomeTaxReconciliationImpactOfNonTaxableEquityEarning	-5000000	USD
CY2018	nrg	Income Tax Reconciliation Impact Of Non Taxable Equity Earning IncomeTaxReconciliationImpactOfNonTaxableEquityEarning	0	USD
CY2018	nrg	Income Taxes Threshold Percentage IncomeTaxesThresholdPercentage	0.50	pure
CY2018Q4	nrg	Industry Mutual Insurance Company Multiplier IndustryMutualInsuranceCompanyMultiplier	10	pure
CY2016	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	-33000000	USD
CY2017	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	-57000000	USD
CY2018	nrg	Investments In Proceeds From Sales Of Unconsolidated Affiliates InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates	-39000000	USD
CY2018Q4	nrg	Longterm Debtexcluding Unamortized Discount Premiumnet LongtermDebtexcludingUnamortizedDiscountPremiumnet	6692000000	USD
CY2018	nrg	Maximum Remaining Termunder Individual Purchased Power Contract MaximumRemainingTermunderIndividualPurchasedPowerContract	P10Y
CY2018Q4	nrg	Mutual Lost Revenue Insurance Maximum Weekly Recovery MutualLostRevenueInsuranceMaximumWeeklyRecovery	3000000	USD
CY2018Q4	nrg	Mutual Property Insurance Additional Blanket Policy Property Coverage MutualPropertyInsuranceAdditionalBlanketPolicyPropertyCoverage	1250000000	USD
CY2018Q4	nrg	Mutual Property Insurance Individual Maximum Property Coverage Limit MutualPropertyInsuranceIndividualMaximumPropertyCoverageLimit	1500000000	USD
CY2016	nrg	Net Contributions To Distributions From Discontinued Operations NetContributionsToDistributionsFromDiscontinuedOperations	-58000000	USD
CY2017	nrg	Net Contributions To Distributions From Discontinued Operations NetContributionsToDistributionsFromDiscontinuedOperations	150000000	USD
CY2018	nrg	Net Contributions To Distributions From Discontinued Operations NetContributionsToDistributionsFromDiscontinuedOperations	-60000000	USD
CY2018Q4	nrg	Net Credit Exposure NetCreditExposure	180000000	USD
CY2016	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2017	nrg	Other Comprehensive Income Loss Net Of Tax And Adjustment For New Accounting Standard OtherComprehensiveIncomeLossNetOfTaxAndAdjustmentForNewAccountingStandard	51000000	USD
CY2017Q4	nrg	Net Deferred Tax Asset Before Valuation Allowance NetDeferredTaxAssetBeforeValuationAllowance	2000000000	USD
CY2018Q4	nrg	Net Deferred Tax Asset Before Valuation Allowance NetDeferredTaxAssetBeforeValuationAllowance	3800000000	USD
CY2016	nrg	Noncontrolling Interest Contributionsfrom Noncontrolling Interest Holders NoncontrollingInterestContributionsfromNoncontrollingInterestHolders	30000000	USD
CY2017	nrg	Noncontrolling Interest Contributionsfrom Noncontrolling Interest Holders NoncontrollingInterestContributionsfromNoncontrollingInterestHolders	160000000	USD
CY2018	nrg	Noncontrolling Interest Contributionsfrom Noncontrolling Interest Holders NoncontrollingInterestContributionsfromNoncontrollingInterestHolders	304000000	USD
CY2017Q4	nrg	Nuclear Decommission Asset Retirement Obligations NuclearDecommissionAssetRetirementObligations	269000000	USD
CY2018Q4	nrg	Nuclear Decommission Asset Retirement Obligations NuclearDecommissionAssetRetirementObligations	282000000	USD
CY2017Q4	nrg	Nuclear Decommissioning Trust Fund Liability Noncurrent NuclearDecommissioningTrustFundLiabilityNoncurrent	415000000	USD
CY2018Q4	nrg	Nuclear Decommissioning Trust Fund Liability Noncurrent NuclearDecommissioningTrustFundLiabilityNoncurrent	371000000	USD
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Annual Assessment NuclearInsuranceFinancialProtectionPoolMaximumAnnualAssessment	21000000	USD
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Assessment NuclearInsuranceFinancialProtectionPoolMaximumAssessment	138000000	USD
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Maximum Assessment Administrative Fee As A Percent NuclearInsuranceFinancialProtectionPoolMaximumAssessmentAdministrativeFeeAsAPercent	0.05	pure
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Nuclear Operator Maximum Annual Assessment NuclearInsuranceFinancialProtectionPoolNuclearOperatorMaximumAnnualAssessment	9000000	USD
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Nuclear Operator Total Assessment NuclearInsuranceFinancialProtectionPoolNuclearOperatorTotalAssessment	61000000	USD
CY2018Q4	nrg	Nuclear Insurance Financial Protection Pool Value NuclearInsuranceFinancialProtectionPoolValue	13400000000	USD
CY2018Q4	nrg	Nuclear Insurance Per Incident Coverage Limit NuclearInsurancePerIncidentCoverageLimit	14070000000	USD
CY2018Q4	nrg	Nuclear Insurance Requirement Per Site NuclearInsuranceRequirementPerSite	450000000	USD
CY2018	nrg	Number Of Years Board Of Directors Of Industry Mutual Insurance Company Can Adjust Policy After Policy Expires NumberOfYearsBoardOfDirectorsOfIndustryMutualInsuranceCompanyCanAdjustPolicyAfterPolicyExpires	P6Y
CY2017Q4	nrg	Other Assets Noncurrent Emission Allowances OtherAssetsNoncurrentEmissionAllowances	9000000	USD
CY2018Q4	nrg	Other Assets Noncurrent Emission Allowances OtherAssetsNoncurrentEmissionAllowances	12000000	USD
CY2016	nrg	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Divestiture Of Business Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIDivestitureOfBusinessNetOfTax	0	USD
CY2017	nrg	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Divestiture Of Business Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIDivestitureOfBusinessNetOfTax	0	USD
CY2018	nrg	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Divestiture Of Business Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIDivestitureOfBusinessNetOfTax	25000000	USD
CY2018	nrg	Period Beyondwhich Comapny Can Not Predict Holdingof Collateral PeriodBeyondwhichComapnyCanNotPredictHoldingofCollateral	P12M
CY2018	nrg	Periodofretrospectivepremiumadjustments Periodofretrospectivepremiumadjustments	P24M
CY2018Q4	nrg	Power Generation Capacity Megawatts PowerGenerationCapacityMegawatts	23000
CY2017	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2018	nrg	Proceeds From Payments To Intercompany Loans ProceedsFromPaymentsToIntercompanyLoans	0	USD
CY2016	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	36000000	USD
CY2017	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	8000000	USD
CY2018	nrg	Proceeds From Renewable Energy Grants ProceedsFromRenewableEnergyGrants	0	USD
CY2016	nrg	Redeemable Noncontrolling Interest Cash Contributionsfrom Noncontrolling Interest Holders RedeemableNoncontrollingInterestCashContributionsfromNoncontrollingInterestHolders	33000000	USD
CY2017	nrg	Redeemable Noncontrolling Interest Cash Contributionsfrom Noncontrolling Interest Holders RedeemableNoncontrollingInterestCashContributionsfromNoncontrollingInterestHolders	99000000	USD
CY2018	nrg	Redeemable Noncontrolling Interest Cash Contributionsfrom Noncontrolling Interest Holders RedeemableNoncontrollingInterestCashContributionsfromNoncontrollingInterestHolders	26000000	USD
CY2016	nrg	Reversal Previously Recognized Unrealized Gains Losses Acquiredas Partof Acquisition Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges	12000000	USD
CY2017	nrg	Reversal Previously Recognized Unrealized Gains Losses Acquiredas Partof Acquisition Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges	0	USD
CY2018	nrg	Reversal Previously Recognized Unrealized Gains Losses Acquiredas Partof Acquisition Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges	10000000	USD
CY2016	nrg	Reversal Previously Recognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	128000000	USD
CY2017	nrg	Reversal Previously Recognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	-47000000	USD
CY2018	nrg	Reversal Previously Recognized Unrealized Gains Losses Settled Positions Economic Hedges ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges	73000000	USD
CY2016	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	-10000000	USD
CY2017	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	25000000	USD
CY2018	nrg	Reversal Previously Unrecognized Unrealized Gains Losses Settled Positions Trading Activity ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity	12000000	USD
CY2016	nrg	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Effective Income Tax Rate Reconciliation TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateEffectiveIncomeTaxRateReconciliation	0	USD
CY2017	nrg	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Effective Income Tax Rate Reconciliation TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateEffectiveIncomeTaxRateReconciliation	665000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Other Longterm Liabilities VariableInterestEntityConsolidatedCarryingAmountOtherLongtermLiabilities	7000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Other Longterm Liabilities VariableInterestEntityConsolidatedCarryingAmountOtherLongtermLiabilities	7000000	USD
CY2018	nrg	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Effective Income Tax Rate Reconciliation TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateEffectiveIncomeTaxRateReconciliation	0	USD
CY2016	nrg	Tax Cuts And Jobs Actof2017 Incomeplete Accounting Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Amount TaxCutsAndJobsActof2017IncomepleteAccountingEffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceAmount	0	USD
CY2017	nrg	Tax Cuts And Jobs Actof2017 Incomeplete Accounting Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Amount TaxCutsAndJobsActof2017IncomepleteAccountingEffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceAmount	-660000000	USD
CY2018	nrg	Tax Cuts And Jobs Actof2017 Incomeplete Accounting Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Amount TaxCutsAndJobsActof2017IncomepleteAccountingEffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceAmount	0	USD
CY2016Q2	nrg	Temporary Equity Redemption Percentage TemporaryEquityRedemptionPercentage	1.00	pure
CY2016Q2	nrg	Temporary Equity Redemption Percentage TemporaryEquityRedemptionPercentage	1	pure
CY2016Q2	nrg	Temporary Equity Redemption Percentage TemporaryEquityRedemptionPercentage	1	pure
CY2016	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	-128000000	USD
CY2017	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	206000000	USD
CY2018	nrg	Unrealized Gain Loss On Derivatives Mark To Market Economic Hedging Activities UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities	14000000	USD
CY2016	nrg	Unrealized Gain Losson Derivatives Mark To Market Trading Activities UnrealizedGainLossonDerivativesMarkToMarketTradingActivities	28000000	USD
CY2017	nrg	Unrealized Gain Losson Derivatives Mark To Market Trading Activities UnrealizedGainLossonDerivativesMarkToMarketTradingActivities	-11000000	USD
CY2018	nrg	Unrealized Gain Losson Derivatives Mark To Market Trading Activities UnrealizedGainLossonDerivativesMarkToMarketTradingActivities	17000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Current Assets VariableInterestEntityConsolidatedCarryingAmountCurrentAssets	6000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Current Assets VariableInterestEntityConsolidatedCarryingAmountCurrentAssets	3000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Current Liabilities VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities	3000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Current Liabilities VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities	2000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Longterm Debt VariableInterestEntityConsolidatedCarryingAmountLongtermDebt	30000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Longterm Debt VariableInterestEntityConsolidatedCarryingAmountLongtermDebt	29000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Net Property Plantand Equipment VariableInterestEntityConsolidatedCarryingAmountNetPropertyPlantandEquipment	80000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Net Property Plantand Equipment VariableInterestEntityConsolidatedCarryingAmountNetPropertyPlantandEquipment	76000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Other Longterm Assets VariableInterestEntityConsolidatedCarryingAmountOtherLongtermAssets	36000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Other Longterm Assets VariableInterestEntityConsolidatedCarryingAmountOtherLongtermAssets	28000000	USD
CY2017Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Redeemable Noncontrolling Interest VariableInterestEntityConsolidatedCarryingAmountRedeemableNoncontrollingInterest	19000000	USD
CY2018Q4	nrg	Variable Interest Entity Consolidated Carrying Amount Redeemable Noncontrolling Interest VariableInterestEntityConsolidatedCarryingAmountRedeemableNoncontrollingInterest	19000000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	684000000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	862000000	USD
CY2017Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	57000000	USD
CY2018Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	1000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	1022000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	900000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1019000000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	3000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2255000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1811000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-11000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-2000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-13000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-72000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-94000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	8376000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	8510000000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	101000000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6000000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	29000000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	27000000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	79000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	66000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	73000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	38000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	41000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	28000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	32000000	USD
CY2016	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	33000000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	29000000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	29000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	157000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	138000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	107000000	USD
CY2016	us-gaap	Amortization Of Power Contracts Emission Credits AmortizationOfPowerContractsEmissionCredits	49000000	USD
CY2017	us-gaap	Amortization Of Power Contracts Emission Credits AmortizationOfPowerContractsEmissionCredits	51000000	USD
CY2018	us-gaap	Amortization Of Power Contracts Emission Credits AmortizationOfPowerContractsEmissionCredits	48000000	USD
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5000000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5000000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7000000	shares
CY2017Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-101000000	USD
CY2018Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-66000000	USD
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	483000000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1534000000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	99000000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	679000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	679000000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	30000000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	27000000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-27000000	USD
CY2017Q4	us-gaap	Assets Assets	23355000000	USD
CY2018Q4	us-gaap	Assets Assets	10628000000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	4437000000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	3600000000	USD
CY2017Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	12944000000	USD
CY2018Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	3980000000	USD
CY2017Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	744000000	USD
CY2018Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	197000000	USD
CY2017Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	460000000	USD
CY2018Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	366000000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	44000000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	90000000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9000000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	19000000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	20000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	5000000	USD
CY2018Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	1000000	USD
CY2018Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	111000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	591000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	770000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	563000000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1042000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	860000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1086000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	613000000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-182000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	226000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-473000000	USD
CY2016	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	0	USD
CY2017	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	0	USD
CY2018	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	268000000	USD
CY2016	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	483000000	USD
CY2017	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-169000000	USD
CY2018	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	471000000	USD
CY2016	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-388000000	USD
CY2017	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-979000000	USD
CY2018	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-725000000	USD
CY2016	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	471000000	USD
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CY2016	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1000000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-1000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1000000	USD
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.027	pure
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.032	pure
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.015	pure
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	33000000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-4000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-5000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-4000000	USD
CY2017Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	110000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	97000000	USD
CY2017Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	24000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	28000000	USD
CY2017Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	86000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	74000000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	182000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	412000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1573000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1600000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1151000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1200000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	124000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	113000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	110000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	113000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	116000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2162000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2080000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1742000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	507000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	591000000	USD
CY2017	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	18000000	USD
CY2018	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	178000000	USD
CY2016	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-139000000	USD
CY2017	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	9000000	USD
CY2018	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	49000000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-142000000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-49000000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-44000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	539000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	573000000	USD
CY2016	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1700000000	USD
CY2015	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1400000000	USD
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	337000000	USD
CY2017	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	20000000	USD
CY2018	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	6000000	USD
CY2016	us-gaap	Impairment Of Investments ImpairmentOfInvestments	268000000	USD
CY2017	us-gaap	Impairment Of Investments ImpairmentOfInvestments	79000000	USD
CY2018	us-gaap	Impairment Of Investments ImpairmentOfInvestments	15000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-733000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-977000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	465000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-942000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-1406000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	468000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-931000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1389000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	467000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	11000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	17000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-1000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-956000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-178000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	60000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	163000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-1390000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-1345000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	238000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	27000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	288000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-93000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	460000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-2.42
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.66
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.51
CY2016	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-2.42
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.66
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.49
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	-27000000	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	65000000	USD
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-25000000	USD
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-702000000	USD
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-265000000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-992000000	USD
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-5000000	USD
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	69000000	USD
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-336000000	USD
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	80000000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-192000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-18000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-14000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-67000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-102000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-46000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-44000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7000000	USD
CY2018Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	1000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	382000000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	455000000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-106000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-59000000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	10000000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	2000000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-326000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-486000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	98000000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	30000000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	13000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	0	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	19000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	18000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	8000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9000000	USD
CY2017	us-gaap	Increase Decrease Due From Affiliates IncreaseDecreaseDueFromAffiliates	125000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-59000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	44000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	113000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-24000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	83000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	83000000	USD
CY2016	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-16000000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	170000000	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-37000000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-12000000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	13000000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	5000000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-60000000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-143000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-31000000	USD
CY2016	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	124000000	USD
CY2017	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	162000000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	250000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-32000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-9000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	104000000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	120000000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	187000000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	41000000	USD
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4000000	shares
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	29000000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	20000000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	7000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	583000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	557000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	483000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	606000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	543000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	436000000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	453000000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	412000000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	33000000	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	3000000	USD
CY2017Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2018Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2018Q4	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P20Y
CY2017Q4	us-gaap	Liabilities Liabilities	21309000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	11843000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	23355000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	10628000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3354000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2398000000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	17955000000	USD
CY2018Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	9445000000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	846000000	USD
CY2018Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	72000000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	6798000000	USD
CY2018Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	635000000	USD
CY2017Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	33000000	USD
CY2018Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	30000000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	9494000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	6691000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	9180000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6449000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	204000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	72000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	4905000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	74000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1635000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	25000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	27000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	26000000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	2314000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	158000000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	65000000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	43000000	USD
CY2016	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	7000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	566000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-394000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	120000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-768000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1138000000	USD
CY2016	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	-853000000	USD
CY2017	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	-2251000000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	294000000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	-257000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-969000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1526000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1251000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1997000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-757000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-639000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-205000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-369000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	340000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	520000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1908000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1610000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1377000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1437000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	856000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1003000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-774000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-2153000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	268000000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-117000000	USD
CY2017Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-40000000	USD
CY2017Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-16000000	USD
CY2017Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-8000000	USD
CY2017Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-120000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-184000000	USD
CY2018Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-46000000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	24000000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	24000000	USD
CY2018Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2016	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-38000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-72000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	1000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-701000000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-163000000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-626000000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	171000000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1535000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-2153000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	279000000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	72000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-72000000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-11000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	268000000	USD
CY2018	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	2548000000	USD
CY2016	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	0	USD
CY2017	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	0	USD
CY2018	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	63000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-964000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-648000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-515000000	USD
CY2017Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	129000000	USD
CY2018Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	121000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	33000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-30000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	214000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	275000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-1200000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	-741000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	361000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	174000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	398000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	49000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	982000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	29000000	USD
CY2016	us-gaap	Operating Leases Income Statement Contingent Revenue OperatingLeasesIncomeStatementContingentRevenue	272000000	USD
CY2017	us-gaap	Operating Leases Income Statement Contingent Revenue OperatingLeasesIncomeStatementContingentRevenue	253000000	USD
CY2018	us-gaap	Operating Leases Income Statement Contingent Revenue OperatingLeasesIncomeStatementContingentRevenue	104000000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	756000000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	680000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	310000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	289000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-21000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-8000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	10000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	35000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	23000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	14000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	35000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	23000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	12000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-11000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Investment Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax	21000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	38000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	63000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-22000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-46000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	35000000	USD
CY2017Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	233000000	USD
CY2018Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	213000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	534000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	718000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	47000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	51000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18000000	USD
CY2016	us-gaap	Payments For Advance To Affiliate PaymentsForAdvanceToAffiliate	0	USD
CY2017	us-gaap	Payments For Advance To Affiliate PaymentsForAdvanceToAffiliate	125000000	USD
CY2018	us-gaap	Payments For Advance To Affiliate PaymentsForAdvanceToAffiliate	26000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-31000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-22000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6000000	USD
CY2016	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-241000000	USD
CY2017	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-430000000	USD
CY2018	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-1564000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1250000000	USD
CY2018	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	1250000000	USD
CY2016	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	226000000	USD
CY2017	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2016	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	121000000	USD
CY2017	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	42000000	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	32000000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	61000000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	18000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	19000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	76000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	38000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	37000000	USD
CY2016	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	76000000	USD
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	38000000	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	37000000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5000000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5000000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	19000000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	551000000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	512000000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	572000000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	14000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	243000000	USD
CY2016	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1000000	USD
CY2017	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	66000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	544000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	254000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	388000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	458000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	435000000	USD
CY2016	us-gaap	Preferred Stock Accretion Of Redemption Discount PreferredStockAccretionOfRedemptionDiscount	2000000	USD
CY2016	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	5000000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	163000000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	302000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-2000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	21000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4412000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1178000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1100000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-8000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4000000	USD
CY2016	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-27000000	USD
CY2017	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-30000000	USD
CY2018	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-16000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-5146000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-1884000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-1734000000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	510000000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	501000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	513000000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	510000000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	501000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	513000000	USD
CY2016	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	-1000000	USD
CY2017	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	66000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-2337000000	USD
CY2018	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	19000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	-891000000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	-203000000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	-642000000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	163000000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	-1655000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	233000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	96000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	-48000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	-13000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	268000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8229000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4859000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5974000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3048000000	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	45000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	68000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	85000000	USD
CY2015Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	29000000	USD
CY2016Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	46000000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	78000000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	19000000	USD
CY2017Q4	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	84000000	USD
CY2016	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	193000000	USD
CY2017	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	87000000	USD
CY2018	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	0	USD
CY2016	us-gaap	Reorganization Items ReorganizationItems	0	USD
CY2017	us-gaap	Reorganization Items ReorganizationItems	44000000	USD
CY2018	us-gaap	Reorganization Items ReorganizationItems	90000000	USD
CY2016	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	48000000	USD
CY2017	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	22000000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	11000000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	267000000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	279000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	17000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-6268000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-6022000000	USD
CY2017Q4	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	38000000	USD
CY2018Q4	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	34000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8148000000	USD
CY2016	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	7000000	USD
CY2017	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	8000000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	32000000	USD
CY2016	us-gaap	Revenues Revenues	8915000000	USD
CY2017Q1	us-gaap	Revenues Revenues	2021000000	USD
CY2017Q2	us-gaap	Revenues Revenues	2281000000	USD
CY2017Q3	us-gaap	Revenues Revenues	2618000000	USD
CY2017Q4	us-gaap	Revenues Revenues	2154000000	USD
CY2017	us-gaap	Revenues Revenues	9074000000	USD
CY2018Q1	us-gaap	Revenues Revenues	2065000000	USD
CY2018Q2	us-gaap	Revenues Revenues	2461000000	USD
CY2018Q3	us-gaap	Revenues Revenues	2960000000	USD
CY2018Q4	us-gaap	Revenues Revenues	1992000000	USD
CY2018	us-gaap	Revenues Revenues	9478000000	USD
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1032000000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	836000000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	799000000	USD
CY2017	us-gaap	Severance Costs1 SeveranceCosts1	44000000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	90000000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	10000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	35000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	25000000	USD
CY2016	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	6000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	6000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2000000	USD
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	35234664	shares
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5434000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4446000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1968000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-1234000000	USD
CY2015Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	302000000	USD
CY2016Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	USD
CY2017Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	USD
CY2018Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	USD
CY2016Q2	us-gaap	Temporary Equity Liquidation Preference TemporaryEquityLiquidationPreference	345000000	USD
CY2015Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	10000000	shares
CY2016Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	10000000	shares
CY2017Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	10000000	shares
CY2018Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	10000000	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	101580045	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	136638847	shares
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2386000000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3632000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1250000000	USD
CY2018Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	392000000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-100000000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	195000000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	31000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	34000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	26000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	8000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	3000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	4000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	30000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	11000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	13000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	12000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	68000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	1000000	USD
CY2017Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	122000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	107000000	USD
CY2017Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets And Liabilities Net VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet	63000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets And Liabilities Net VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet	50000000	USD
CY2017Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	40000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	38000000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	316000000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	316000000	shares
CY2017Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	316000000	shares
CY2017Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	316000000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	322000000	shares
CY2017Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317000000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	322000000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	314000000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	299000000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	289000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	308000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	308000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	316000000	shares
CY2017Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	316000000	shares
CY2017Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	316000000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317000000	shares
CY2017Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317000000	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	318000000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	310000000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	299000000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	289000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	304000000	shares
CY2018	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Concentrations of Credit Risk</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of trust funds, accounts receivable, notes receivable, derivatives, and investments in debt securities. Trust funds are held in accounts managed by experienced investment advisors. Certain accounts receivable, notes receivable, and derivative instruments are concentrated within entities engaged in the energy industry. These industry concentrations may impact the Company's overall exposure to credit risk, either positively or negatively, in that the customers may be similarly affected by changes in economic, industry or other conditions. Receivables and other contractual arrangements are subject to collateral requirements under the terms of enabling agreements. However, the Company believes that the credit risk posed by industry concentration is offset by the diversification and creditworthiness of its customer base. See </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">Note 4</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;font-style:italic;text-decoration:none;">Fair Value of Financial Instruments</font><font style="font-family:inherit;font-size:10pt;font-style:italic;">,</font><font style="font-family:inherit;font-size:10pt;"> for a further discussion of derivative concentrations.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font></div></div>
CY2018	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;color:#000000;font-style:italic;font-weight:bold;text-decoration:none;">Nature of Business</font><font style="font-family:inherit;font-size:10pt;font-weight:bold;"> </font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:26px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">General</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">NRG Energy, Inc., or NRG or the Company, is an energy company built on dynamic retail brands with diverse generation assets. NRG brings the power of energy to consumers by producing, selling and delivering electricity and related products and services in major competitive power markets in the U.S. in a manner that delivers value to all of NRG's stakeholders. NRG is perfecting the integrated model by balancing retail load with generation supply within its deregulated markets, while evolving to a customer-driven business. The Company sells energy, services, and innovative, sustainable products and services directly to retail customers under the names "NRG" and "Reliant" and other brand names owned by NRG supported by approximately </font><font style="font-family:inherit;font-size:10pt;">23,000</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">(a)</sup></font><font style="font-family:inherit;font-size:10pt;"> MW of generation as of December 31, 2018.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:29px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Retail is a consumer facing business that includes residential and small commercial (Mass Market) consumers and the Company's Business Solutions group, which includes demand response, commodity sales, energy efficiency and energy management solutions. Products and services range from retail energy, portable solar and battery products home services, and a variety of bundled products, which combine energy with protection products, energy efficiency and renewable energy solutions, as well as other distributed and reliability products.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company's Generation business includes plant operations, commercial operations, EPC, asset management, energy services and other critical related functions. In addition to the traditional functions from NRG's wholesale power generation business, Generation also includes NRG's retained renewable generation business.</font></div><div style="line-height:120%;padding-bottom:12px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Discontinued Operations</font></div><div style="line-height:120%;padding-bottom:12px;padding-top:6px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On December 31, 2018, as described in </font><font style="font-family:inherit;font-size:10pt;">Note 3</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Acquisitions, Discontinued Operations and Dispositions</font><font style="font-family:inherit;font-size:10pt;">, the Company concluded that the sale of its South Central Portfolio to Cleco, excluding the Cottonwood facility, met held-for-sale criteria and should be presented as a discontinued operation, as the sale represented a strategic shift in the business in which NRG operates. The financial information for all historical periods has been recast to reflect the presentation of these entities as discontinued operations.</font></div><div style="line-height:120%;padding-bottom:12px;padding-top:6px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On August 31, 2018, as described in </font><font style="font-family:inherit;font-size:10pt;">Note 3</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Acquisitions, Discontinued Operations and Dispositions</font><font style="font-family:inherit;font-size:10pt;font-style:italic;">, </font><font style="font-family:inherit;font-size:10pt;">NRG deconsolidated NRG Yield, Inc. and its Renewables Platform for financial reporting purposes. The financial information for all historical periods has been recast to reflect the presentation of these entities, as well as the Carlsbad project, as discontinued operations. As a result of the sale of NRG Yield, the Company no longer controls the Agua Caliente project. Due to this change in control, the Company has deconsolidated the Agua Caliente project from its financial results and has accounted for the project as an equity method investment. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">GenOn Chapter 11 Cases</font></div><div style="line-height:120%;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On June 14, 2017, or the Petition Date, GenOn, along with GenOn Americas Generation and certain of their directly and indirectly-owned subsidiaries, or collectively the GenOn Entities, filed voluntary petitions for relief under Chapter 11, or the Chapter 11 Cases, of the U.S. Bankruptcy Code, or the Bankruptcy Code, in the U.S. Bankruptcy Court for the Southern District of Texas, Houston Division, or the Bankruptcy Court. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA and certain other subsidiaries, did not file for relief under Chapter 11. As a result of the bankruptcy filings and beginning on June 14, 2017, GenOn and its subsidiaries were deconsolidated from NRG's consolidated financial statements. NRG determined that this disposal of GenOn and its subsidiaries is a discontinued operation and, accordingly, the financial information for all historical periods has been recast to reflect GenOn as a discontinued operation. GenOn's plan of reorganization was confirmed on December 14, 2018.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">    </font></div><div style="line-height:120%;padding-bottom:13px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-bottom:13px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-bottom:13px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:12px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7pt;padding-left:0px;"><font style="font-family:inherit;font-size:7pt;">(a)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7pt;"><font style="font-family:inherit;font-size:7pt;">excluding discontinued operations and held for sale</font></div></td></tr></table></div>
CY2018	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year amounts have been reclassified for comparative purposes. The reclassifications did not affect results from operations, net assets or cash flows.</font></div></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In recording transactions and balances resulting from business operations, the Company uses estimates based on the best information available. Estimates are used for such items as plant depreciable lives, tax provisions, uncollectible accounts, actuarially determined benefit costs, the valuation of energy commodity contracts, environmental liabilities, legal costs incurred in connection with recorded loss contingencies, and assets acquired and liabilities assumed in business combinations, among others. In addition, estimates are used to test long-lived assets and goodwill for impairment and to determine the fair value of impaired assets. As better information becomes available or actual amounts are determinable, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font></div></div>

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$NRG
NRG Energy Inc Stock $nrg

2018 Form 10-K Financial Statement

#000101387119000007 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

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$NRG NRG Energy Inc Stock $nrg

2018 Form 10-K Financial Statement

#000101387119000007 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NRG
NRG Energy Inc Stock $nrg