NRG Energy (NRG) 10-Q 6 Aug 20 2020 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2020	Aug. 06, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-15891
Entity Registrant Name	NRG Energy, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-1724239
Entity Address, Address Line One	804 Carnegie Center,
Entity Address, City or Town	Princeton
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08540
City Area Code	609
Local Phone Number	524-4500
Title of 12(b) Security	Common Stock, par value $0.01
Trading Symbol	NRG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		244,137,848
Entity Central Index Key	0001013871
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues
Total operating revenues	$ 2,238	$ 2,465	$ 4,257	$ 4,630
Operating Costs and Expenses
Cost of operations	1,434	1,845	2,891	3,496
Depreciation and amortization	110	85	219	170
Impairment losses	0	1	0	1
Selling, general and administrative costs	208	211	417	405
Reorganization costs	0	2	3	15
Development costs	2	2	5	4
Total operating costs and expenses	1,754	2,146	3,535	4,091
Gain on sale of assets	0	1	6	2
Operating Income/(Loss)	484	320	728	541
Other Income/(Expense)
Equity in earnings/(losses) of unconsolidated affiliates	12	0	1	(21)
Impairment losses on investments	0	0	(18)	0
Other income, net	14	20	41	32
Loss on debt extinguishment, net	0	(47)	(1)	(47)
Interest expense	(96)	(105)	(193)	(219)
Total other income/(expense)	(70)	(132)	(170)	(255)
Income from Continuing Operations Before Income Taxes	414	188	558	286
Income tax expense/(benefit)	101	(1)	124	3
Income from Continuing Operations	313	189	434	283
Income from discontinued operations, net of income tax	0	13	0	401
Net Income	313	202	434	684
Less: Net income attributable to redeemable noncontrolling interests	0	1	0	1
Net Income Attributable to NRG Energy, Inc.	$ 313	$ 201	$ 434	$ 683
Earnings per Share
Weighted average number of common shares outstanding — basic (in shares)	245	265	246	272
Income from continuing operations per weighted average common share — basic (in usd per share)	$ 1.28	$ 0.71	$ 1.76	$ 1.04
(Loss)/income from discontinued operations per weighted average common share — basic (in usd per share)	0	0.05	0	1.47
Earnings/Loss per Weighted Average Common Share — Basic (in usd per share)	$ 1.28	$ 0.76	$ 1.76	$ 2.51
Weighted average number of common shares outstanding — diluted (in shares)	246	267	247	274
Income from continuing operations per weighted average common share — diluted (in usd per share)	$ 1.27	$ 0.70	$ 1.76	$ 1.03
(Loss)/income from discontinued operations per weighted average common share — diluted (in usd per share)	0	0.05	0	1.46
Earnings/(Loss) per Weighted Average Common Share — Diluted (in usd per share)	$ 1.27	$ 0.75	$ 1.76	$ 2.49

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 313		$ 202		$ 434	$ 684
Other Comprehensive Income/(Loss)
Foreign currency translation adjustments	13		(1)		(2)	0
Available-for-sale securities	0		1		0	1
Defined benefit plans	0		(3)		0	(6)
Other comprehensive income/(loss)	13	$ (15)	(3)	$ (2)	(2)	(5)
Comprehensive Income	326		199		432	679
Less: Comprehensive income attributable to redeemable noncontrolling interest	0		1		0	1
Comprehensive Income Attributable to NRG Energy, Inc.	$ 326		$ 198		$ 432	$ 678

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 418	$ 345
Funds deposited by counterparties	36	32
Restricted cash	8	8
Accounts receivable, net	1,015	1,025
Inventory	388	383
Derivative instruments	791	860
Cash collateral paid in support of energy risk management activities	136	190
Prepayments and other current assets	284	245
Total current assets	3,076	3,088
Property, plant and equipment, net	2,533	2,593
Other Assets
Equity investments in affiliates	372	388
Operating lease right-of-use assets, net	429	464
Goodwill	579	579
Intangible assets, net	733	789
Nuclear decommissioning trust fund	794	794
Derivative instruments	439	310
Deferred income taxes	3,170	3,286
Other non-current assets	212	240
Total other assets	6,728	6,850
Total Assets	12,337	12,531
Current Liabilities
Current portion of long-term debt	7	88
Current portion of operating lease liabilities	69	73
Accounts payable	736	722
Derivative instruments	728	781
Cash collateral received in support of energy risk management activities	36	32
Accrued expenses and other current liabilities	581	663
Total current liabilities	2,157	2,359
Other Liabilities
Long-term debt	5,810	5,803
Non-current operating lease liabilities	458	483
Nuclear decommissioning reserve	307	298
Nuclear decommissioning trust liability	478	487
Derivative instruments	299	322
Deferred income taxes	17	17
Other non-current liabilities	1,061	1,084
Total other liabilities	8,430	8,494
Total Liabilities	10,587	10,853
Redeemable noncontrolling interest in subsidiaries	0	20
Commitments and Contingencies
Stockholders' Equity
Common stock; $0.01 par value; 500,000,000 shares authorized; 423,031,777 and 421,890,790 shares issued and 244,137,848 and 248,996,189 shares outstanding at June 30, 2020 and December 31, 2019, respectively	4	4
Additional paid-in-capital	8,505	8,501
Accumulated deficit	(1,331)	(1,616)
Treasury stock, at cost - 178,893,929 and 172,894,601 shares at June 30, 2020 and December 31, 2019, respectively	(5,234)	(5,039)
Accumulated other comprehensive loss	(194)	(192)
Total Stockholders' Equity	1,750	1,658
Total Liabilities and Stockholders' Equity	$ 12,337	$ 12,531
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, par or value (in usd per share)	$ 0.01	$ 0.01

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par or value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	423,031,777	421,890,790
Common stock, shares outstanding (in shares)	244,137,848	248,996,189
Treasury stock, shares (in shares)	178,893,929	172,894,601

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities
Net Income	$ 434	$ 684
Income from discontinued operations, net of income tax	0	401
Income/(loss) from continuing operations	434	283
Adjustments to reconcile net income to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates	7	22
Depreciation and amortization	219	170
Accretion of asset retirement obligations	18	14
Provision for credit losses	48	52
Amortization of nuclear fuel	25	27
Amortization of financing costs and debt discount/premiums	12	13
Loss on debt extinguishment, net	1	47
Amortization of emissions allowances and energy credits	33	14
Amortization of unearned equity compensation	12	10
(Gain)/loss on sale of assets and disposal of assets	(15)	1
Impairment losses	18	1
Changes in derivative instruments	(131)	(22)
Changes in deferred income taxes and liability for uncertain tax benefits	116	(5)
Changes in collateral deposits in support of energy risk management activities	58	125
Changes in nuclear decommissioning trust liability	36	17
Changes in other working capital	(199)	(352)
Cash provided by continuing operations	692	417
Cash provided by discontinued operations	0	8
Net Cash Provided/(Used) by Operating Activities	692	425
Cash Flows from Investing Activities
Payments for acquisitions of businesses	(5)	(21)
Capital expenditures	(116)	(107)
Net purchases of emission allowances	(4)	(1)
Investments in nuclear decommissioning trust fund securities	(257)	(209)
Proceeds from the sale of nuclear decommissioning trust fund securities	220	191
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	15	1,289
Net distributions from investments in unconsolidated affiliates	2	7
Contributions to discontinued operations	0	(44)
Cash (used)/provided by continuing operations	(145)	1,105
Cash used by discontinued operations	0	(2)
Net Cash (Used)/Provided by Investing Activities	(145)	1,103
Cash Flows from Financing Activities
Payments of dividends to common stockholders	(148)	(16)
Payments for share repurchase activity	(229)	(1,075)
Payments for debt extinguishment costs	0	(24)
Purchase of and distributions to noncontrolling interests from subsidiaries	(2)	(1)
Proceeds from issuance of common stock	1	2
Proceeds from issuance of long-term debt	59	1,833
Repayments of long-term debt	(61)	(2,485)
Net repayment of Revolving Credit Facility	(83)	0
Other	(5)	0
Cash used by continuing operations	(469)	(1,799)
Cash provided by discontinued operations	0	43
Net Cash Used by Financing Activities	(469)	(1,756)
Effect of exchange rate changes on cash and cash equivalents	(1)	0
Change in Cash from discontinued operations	0	49
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	77	(277)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	385	613
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 462	$ 336

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018		$ (1,234)	$ 4	$ 8,510	$ (6,022)	$ (3,632)	$ (94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		482			482
Other comprehensive (loss) income, net of tax		(2)					(2)
Share repurchases		(749)		(10)		(739)
Equity-based awards activity, net		(32)		(32)
Issuance of common stock		5		5
Common stock dividends and dividend equivalents declared	[1]	(8)			(8)
Ending balance at Mar. 31, 2019		(1,538)	4	8,473	(5,548)	(4,371)	(96)
Beginning balance at Dec. 31, 2018		(1,234)	4	8,510	(6,022)	(3,632)	(94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		683
Other comprehensive (loss) income, net of tax		(5)
Ending balance at Jun. 30, 2019		(1,648)	4	8,488	(5,355)	(4,686)	(99)
Beginning balance at Mar. 31, 2019		(1,538)	4	8,473	(5,548)	(4,371)	(96)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		201			201
Other comprehensive (loss) income, net of tax		(3)					(3)
Share repurchases		(305)		10		(315)
Equity-based awards activity, net		5		5
Common stock dividends and dividend equivalents declared	[1]	(8)			(8)
Ending balance at Jun. 30, 2019		(1,648)	4	8,488	(5,355)	(4,686)	(99)
Beginning balance at Dec. 31, 2019		1,658	4	8,501	(1,616)	(5,039)	(192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		121			121
Other comprehensive (loss) income, net of tax		(15)					(15)
Repurchase of partners' equity interest in VIE		18		18
Share repurchases		(150)				(150)
Equity-based awards activity, net		(21)		(21)
Common stock dividends and dividend equivalents declared	[1]	(75)			(75)
Ending balance at Mar. 31, 2020		1,536	4	8,498	(1,570)	(5,189)	(207)
Beginning balance at Dec. 31, 2019		1,658	4	8,501	(1,616)	(5,039)	(192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		434
Other comprehensive (loss) income, net of tax		(2)
Ending balance at Jun. 30, 2020		1,750	4	8,505	(1,331)	(5,234)	(194)
Beginning balance at Mar. 31, 2020		1,536	4	8,498	(1,570)	(5,189)	(207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to NRG Energy, Inc.		313			313
Other comprehensive (loss) income, net of tax		13					13
Shares reissuance for ESPP		2				2
Share repurchases		(47)				(47)
Equity-based awards activity, net		6		6
Issuance of common stock		1		1
Common stock dividends and dividend equivalents declared	[1]	(74)			(74)
Ending balance at Jun. 30, 2020		$ 1,750	$ 4	$ 8,505	$ (1,331)	$ (5,234)	$ (194)
[1]	Dividends per common share were $0.30 for each of the quarters ended June 30, 2020 and March 31, 2020 and $0.03 for each of the quarters ended June 30, 2019 and March 31, 2019

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends per common share (in usd per share)	$ 0.30	$ 0.30	$ 0.03	$ 0.03

Nature of Business and Basis of

Nature of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Nature of Business and Basis of Presentation General NRG Energy, Inc., or NRG or the Company, is an integrated power company built on dynamic retail brands with diverse generation assets. NRG brings the power of energy to consumers by producing and selling electricity and related products and services in major competitive power markets in the U.S. and Canada in a manner that delivers value to all of NRG's stakeholders. NRG is a customer-driven business focused on perfecting the integrated model by balancing retail load with generation supply within its deregulated markets. The Company sells energy, services, and innovative, sustainable products and services directly to retail customers under the brand names NRG, Reliant, Green Mountain Energy, Stream, and XOOM Energy, as well as other brand names owned by NRG, supported by approximately 23,000 MW of generation as of June 30, 2020. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the condensed consolidated financial statements in the Company's 2019 Form 10-K and the Current Report on Form 8-K filed May 7, 2020, which provides retrospectively revised historical financial information to correspond with the Company's current segment structure. Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of June 30, 2020, and the results of operations, comprehensive income, cash flows and statements of stockholders' equity for the three and six months ended June 30, 2020 and 2019. Segments As part of perfecting the integrated model, in which the majority of the Company’s generation serves its retail customers, the Company began managing its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus in 2020. As a result, the Company changed its business segments from Retail and Generation to Texas, East and West/Other beginning in the first quarter of 2020. The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources. The Company's businesses are segregated as follows: • Texas, which includes all activity related to customer, plant and market operations in Texas; • East, which includes the remaining activity related to customer operations and all activity related to plant and market operations in the East; • West/Other, which includes the following assets and activities: (i) all activity related to plant and market operations in the West, (ii) activity related to the Cottonwood power plant that was sold to Cleco on February 4, 2019 and is being leased back until 2025, (iii) the remaining renewables activity, including the Company’s equity method investments in Ivanpah Master Holdings, LLC and Agua Caliente, the remaining Home Solar assets and the NFL stadium solar generating assets, and (iv) activity related to the Company’s equity method investment for the Gladstone power plant in Australia; and • Corporate activities. All affected disclosures have been recast to reflect these changes for all periods presented. For further discussion of segment reporting, refer to Note 13, Segment Reporting . COVID-19 In March 2020, the World Health Organization categorized COVID-19 as a pandemic and the President of the United States declared the COVID-19 outbreak a national emergency. Electricity was deemed a 'critical and essential business operation' under various state and federal governmental COVID-19 mandates. NRG had activated its Crisis Management Team ("CMT") in January 2020 to proactively manage the Company's response to the impacts of COVID-19. NRG continues to remain focused on protecting the health and well-being of its employees, while supporting its customers and the communities in which it operates and assuring the continuity of its operations. During the second quarter of 2020, the Company began to evaluate and implement protocols for return to normal work operations. The Company continues to maintain certain restrictions on business travel and face-to-face sales channels, remote work practices remain in place and there are enhanced cleaning and hygiene protocols in all of its facilities. In addition, select essential employees and contractors are continuing to report to plant and certain office locations. The Company also continues to require pre-entry screening, including temperature checks, separation of work crews, additional personal protective equipment for employees and contractors when social distancing cannot be maintained, and a ban on all non-essential visitors. The Company has not experienced any material disruptions in its ability to continue its business operations to date. Use of Estimates The preparation of financial statements in conformity with GAAP 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. Reclassifications Certain prior year amounts have been reclassified for comparative purposes.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Other Balance Sheet Information The following table presents the accumulated depreciation included in property, plant and equipment, net and accumulated amortization included in intangible assets, net: (In millions) June 30, 2020 December 31, 2019 Property, plant and equipment accumulated depreciation $ 1,868 $ 1,752 Intangible assets accumulated amortization 1,279 1,262 Credit Losses On January 1, 2020, the Company adopted ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , or ASU No. 2016-13, using the modified retrospective approach. Following the adoption of the new standard, the Company’s process of estimating expected credit losses remains materially consistent with its historical practice. Information prior to January 1, 2020, which was previously referred to as the allowance and provision for bad debt, has not been restated and continues to be reported under the accounting standards in effect for that period. Retail trade receivables are reported on the balance sheet net of the allowance for credit losses. The Company accrues an allowance for current expected credit losses based on (i) estimates of uncollectible revenues by analyzing accounts receivable aging and current and reasonable forecasts of expected economic factors including, but not limited to, unemployment rates and weather-related events, (ii) historical collections and delinquencies, and (iii) counterparty credit ratings for commercial and industrial customers. The following table represents the activity in the allowance for credit losses for the three and six months ended June 30, 2020: (In millions) Three months ended June 30, 2020 Six months ended June 30, 2020 Beginning balance $ 39 $ 43 Provision for credit losses 24 48 Write-offs (20) (52) Recoveries collected 4 8 Ending balance $ 47 $ 47 Restricted Cash The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: (In millions) June 30, 2020 December 31, 2019 Cash and cash equivalents $ 418 $ 345 Funds deposited by counterparties 36 32 Restricted cash 8 8 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 462 $ 385 Funds deposited by counterparties consist of cash held by the Company as a result of collateral posting obligations from its counterparties. Some amounts are segregated into separate accounts that are not contractually restricted but, based on the Company's intention, are not available for the payment of general corporate obligations. Depending on market fluctuations and the settlement of the underlying contracts, the Company will refund this collateral to the hedge counterparties pursuant to the terms and conditions of the underlying trades. Since collateral requirements fluctuate daily and the Company cannot predict if any collateral will be held for more than twelve months, the funds deposited by counterparties are classified as a current asset on the Company's balance sheet, with an offsetting liability for this cash collateral received within current liabilities. Restricted cash consists primarily of funds held within the Company's projects that are restricted for specific uses. Pension Plan Contributions On March 27, 2020, the Senate passed the CARES Act to provide necessary emergency relief related to the COVID-19 pandemic. The CARES Act allows NRG and other pension plan sponsors to postpone 2020 contributions until January 1, 2021. As a result, NRG will consider deferring approximately $47 million in cash contributions previously planned to be made to the Company's pension plans in 2020. NRG’s pension and postretirement benefit plans are further described in Note 15, Benefit Plans and Other Postretirement Benefits , to the Company’s 2019 Form 10-K. Recent Accounting Developments - Guidance Adopted in 2020 ASU 2018-17 — In October 2018, the FASB issued ASU No. 2018-17, Consolidations (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities , or ASU No. 2018-17, in response to stakeholders’ observations that Topic 810, Consolidations , could be improved thereby improving general purpose financial reporting. Specifically, ASU No. 2018-17 requires application of the variable interest entity (VIE) guidance to private companies under common control and consideration of indirect interest held through related parties under common control for determining whether fees paid to decision makers and service providers are variable interests. The amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. All entities are required to apply the amendments retrospectively. The adoption did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2018-15 — In August 2018, the FASB issued ASU No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in Cloud Computing Arrangement That Is a Service Contract , or ASU No. 2018-15. The amendments in ASU No. 2018-15 align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal-use software (and hosting arrangement that include an internal-use software license). The amendment also requires the customer to amortize the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The Company adopted the amendments effective January 1, 2020 using the prospective approach. The adoption did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2018-13 — In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirement for Fair value Measurement) , or ASU No. 2018-13. The amendments in ASU No. 2018-13 eliminate such disclosures as the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and add new disclosure requirements for Level 3 measurements. ASU No. 2018-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Certain disclosures in ASU No. 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. The Company adopted the amendments effective January 1, 2020. As the amendments contemplates changes in disclosures only, it did not have an impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2016-13 — In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Statements, or ASU No. 2016-13, which was further amended through various updates issued by the FASB thereafter. The guidance in ASU No. 2016-13 provides a new model for recognizing credit losses on financial assets carried at amortized cost using an estimate of expected credit losses, instead of the "incurred loss" methodology previously required for recognizing credit losses that delayed recognition until it was probable that a loss was incurred. The estimate of expected credit losses is to be based on consideration of past events, current conditions and reasonable and supportable forecasts of future conditions. The Company adopted the standard and its subsequent corresponding updates effective January 1, 2020 using the modified retrospective approach. Results for the reporting periods after January 1, 2020 are presented under Topic 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company's adoption of Topic 326 did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. Recent Accounting Developments - Guidance Not Yet Adopted ASU 2019-12 — In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Performance Obligations As of June 30, 2020, estimated future fixed fee performance obligations are $314 million for the remaining six months of fiscal year 2020, and $620 million, $307 million, $42 million and $8 million for the fiscal years 2021, 2022, 2023 and 2024, respectively. These performance obligations are for cleared auction MWs in the PJM, ISO-NE, NYISO and MISO capacity auctions and are subject to penalties for non performance. Disaggregated Revenues The following tables represent the Company’s disaggregation of revenue from contracts with customers for the three and six months ended June 30, 2020 and 2019: Three months ended June 30, 2020 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 1,273 $ 291 $ — $ — $ 1,564 Business Solutions 248 20 — — 268 Total retail revenue 1,521 311 — — 1,832 Energy revenue (a) 5 19 60 (1) 83 Capacity revenue (a) — 179 16 — 195 Mark-to-market for economic hedging activities (b) — 40 1 2 43 Other revenue (a) 52 17 17 (1) 85 Total operating revenue 1,578 566 94 — 2,238 Less: Lease revenue — 1 4 — 5 Less: Realized and unrealized ASC 815 revenue 7 85 16 1 109 Total revenue from contracts with customers $ 1,571 $ 480 $ 74 $ (1) $ 2,124 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ — $ 2 $ 10 $ (1) $ 11 Capacity revenue — 41 — — 41 Other revenue 7 2 5 — 14 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended June 30, 2019 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 1,161 $ 235 $ — $ (1) $ 1,395 Business Solutions 272 18 — — 290 Total retail revenue 1,433 253 — (1) 1,685 Energy revenue (a) 136 48 52 — 236 Capacity revenue (a) — 195 6 — 201 Mark-to-market for economic hedging activities (b) 210 16 16 (1) 241 Other revenue (a) 58 12 32 — 102 Total operating revenue 1,837 524 106 (2) 2,465 Less: Lease revenue — 1 4 — 5 Less: Realized and unrealized ASC 815 revenue 579 64 34 — 677 Total revenue from contracts with customers $ 1,258 $ 459 $ 68 $ (2) $ 1,783 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ 355 $ 20 $ 5 $ — $ 380 Capacity revenue — 29 — 1 30 Other revenue 14 (1) 13 — 26 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2020 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 2,305 $ 638 $ — $ (1) $ 2,942 Business Solutions 508 43 — — 551 Total retail revenue 2,813 681 — (1) 3,493 Energy revenue (a) 10 64 135 (2) 207 Capacity revenue (a) — 313 31 — 344 Mark-to-market for economic hedging activities (b) — 20 16 3 39 Other revenue (a) 113 27 37 (3) 174 Total operating revenue 2,936 1,105 219 (3) 4,257 Less: Lease revenue — 1 9 — 10 Less: Realized and unrealized ASC 815 revenue 14 124 60 — 198 Total revenue from contracts with customers $ 2,922 $ 980 $ 150 $ (3) $ 4,049 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ — $ 37 $ 29 $ (2) $ 64 Capacity revenue — 65 — — 65 Other revenue 14 2 15 (1) 30 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2019 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 2,156 $ 555 $ — $ (3) $ 2,708 Business Solutions 530 36 — — 566 Total retail revenue 2,686 591 — (3) 3,274 Energy revenue (a) 241 174 110 1 526 Capacity revenue (a) — 339 18 — 357 Mark-to-market for economic hedging activities (b) 241 1 20 (1) 261 Other revenue (a) 135 28 51 (2) 212 Total operating revenue 3,303 1,133 199 (5) 4,630 Less: Lease revenue — 1 9 — 10 Less: Realized and unrealized ASC 815 revenue 894 118 46 — 1,058 Total revenue from contracts with customers $ 2,409 $ 1,014 $ 144 $ (5) $ 3,562 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ 626 $ 67 $ 7 $ — $ 700 Capacity revenue — 47 — 1 48 Other revenue 27 3 19 — 49 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Contract Balances The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of June 30, 2020 and December 31, 2019: (In millions) June 30, 2020 December 31, 2019 Deferred customer acquisition costs $ 133 $ 133 Accounts receivable, net - Contracts with customers 981 1,002 Accounts receivable, net - Derivative instruments 30 18 Accounts receivable, net - Affiliate 4 5 Total accounts receivable, net $ 1,015 $ 1,025 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 328 $ 402 Deferred revenues (a) 84 82 (a) Deferred revenues from contracts with customers for the three months ended June 30, 2020 and the year ended December 31, 2019 were approximately $33 million and $24 million, respectively The revenue recognized from contracts with customers during both the six months ended June 30, 2020 and 2019 relating to the deferred revenue balance at the beginning of each period was $13 million. The revenue recognized during the three months ended June 30, 2020 and 2019 relating to the deferred revenue balance at the beginning of each period was $25 million and $19 million, respectively. The change in deferred revenue balances during the three and six months ended June 30, 2020 and 2019 was primarily due to the timing difference of when consideration was received and when the performance obligation was transferred.

Acquisitions, Discontinued Oper

Acquisitions, Discontinued Operations and Dispositions	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Acquisitions, Discontinued Operations and Dispositions	Acquisitions, Discontinued Operations and Dispositions Acquisitions Stream Energy Acquisition On August 1, 2019, the Company acquired Stream Energy's retail electricity and natural gas operating in 9 states and Washington, D.C. for $329 million, including working capital and other adjustments of approximately $29 million. The acquisition increased NRG's retail portfolio by approximately 600,000 RCEs or 450,000 customers. The purchase price was allocated as follows: (In millions) Account receivable $ 98 Accounts payable (73) Other net current and non-current working capital 5 Marketing partnership 154 Customer relationships 85 Trade name 28 Other intangible assets 26 Goodwill (a) 6 Stream Purchase Price $ 329 (a) Goodwill arising from the acquisition is attributed to the value of the platform acquired and the synergies expected from combining the operations of Stream Energy with NRG's existing businesses. Goodwill of $5 million and $1 million was assigned to the Texas and East segments, respectively, and is not deductible for tax purposes Discontinued Operations Sale of South Central Portfolio On February 4, 2019, the Company completed the sale of the South Central Portfolio to Cleco for cash consideration of $1 billion excluding working capital and other adjustments. The Company concluded that the divested business met the criteria for discontinued operations as of December 31, 2018, as the disposition represented a strategic shift in the business in which NRG operates and the criteria for held-for-sale were met. As such, all prior period results for the operations of the South Central Portfolio, except for the Cottonwood facility as discussed below, were reclassified as discontinued operations at December 31, 2018. In connection with the transaction, NRG also entered into a transition services agreement to provide certain corporate services to the divested business. The South Central Portfolio includes the 1,153 MW Cottonwood natural gas generating facility. Upon the closing of the sale of the South Central Portfolio, NRG entered into an agreement with Cleco to leaseback the Cottonwood facility through 2025. Due to its continuing involvement with the Cottonwood facility, NRG did not use held-for-sale or discontinued operations treatment in accounting for the Cottonwood facility. Summarized results of the South Central Portfolio discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Operating revenues $ — $ 31 Operating costs and expenses — (23) Gain from operations of discontinued components — 8 Gain on disposal of discontinued operations, net of tax 1 28 Gain from discontinued operations, including disposal, net of tax $ 1 $ 36 Carlsbad On February 6, 2018, NRG entered into an agreement with NRG Yield and GIP to sell 100% of its membership interests in Carlsbad Energy Holdings LLC, which owns the Carlsbad project, for $385 million of cash consideration, excluding working capital adjustments. The primary condition to close the Carlsbad transaction was the completion of the sale of NRG Yield and the Renewables Platform. At the time of the sale of NRG Yield and the Renewables Platform in August 2018, the Company concluded that the Carlsbad project met the criteria for discontinued operations and accordingly, all prior period results for Carlsbad were reclassified as discontinued operations. The transaction closed on February 27, 2019. Carlsbad continues to have a ground lease and easement agreement with NRG with an initial term ending in 2039 and two, ten Summarized results of Carlsbad discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Operating revenues $ — $ 19 Operating costs and expenses — (9) Other expenses — (5) Gain from discontinued operations, net of tax — 5 (Loss)/gain on disposal of discontinued operations, net of tax (17) 331 Other Commitments, Indemnification and Fees 27 27 Gain on disposal of discontinued operations, net of tax 10 358 Gain from discontinued operations, including disposal, net of tax $ 10 $ 363 GenOn On June 14, 2017, the GenOn Entities filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the Texas Bankruptcy Court. As a result of the bankruptcy filings, NRG concluded that it no longer controlled GenOn as it was subject to the control of the Texas Bankruptcy Court; and accordingly, NRG deconsolidated GenOn and its subsidiaries for financial reporting purposes as of such date. Summarized results of GenOn discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Gain from discontinued operations, net of tax $ 2 $ 2 Dispositions The Company completed other asset sales for cash proceeds of $15 million and $18 million during the six months ended June 30, 2020 and 2019, respectively.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments For cash and cash equivalents, funds deposited by counterparties, restricted cash, accounts and other receivables, accounts payable, and cash collateral paid and received in support of energy risk management activities, the carrying amounts approximate fair values because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy. The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows: June 30, 2020 December 31, 2019 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Notes receivable $ 10 $ 7 $ 11 $ 8 Liabilities: Long-term debt, including current portion (a) 5,878 6,208 5,956 6,504 (a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt in the Company's consolidated balance sheets The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion, as of June 30, 2020 and December 31, 2019: June 30, 2020 December 31, 2019 (In millions) Level 2 Level 3 Level 2 Level 3 Long-term debt, including current portion $ 6,176 $ 32 $ 6,388 $ 116 Recurring Fair Value Measurements Debt securities, equity securities, and trust fund investments, which are comprised of various U.S. debt and equity securities, and derivative assets and liabilities, are carried at fair market value. The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: June 30, 2020 (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 13 $ — $ 13 $ — Nuclear trust fund investments: Cash and cash equivalents 26 26 — — U.S. government and federal agency obligations 48 47 1 — Federal agency mortgage-backed securities 87 — 87 — Commercial mortgage-backed securities 38 — 38 — Corporate debt securities 148 — 148 — Equity securities 371 371 — — Foreign government fixed income securities 7 — 7 — Other trust fund investments: U.S. government and federal agency obligations 1 1 — — Derivative assets: Commodity contracts 1,230 87 677 466 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 69 Equity securities 7 Total assets $ 2,045 $ 532 $ 971 $ 466 Derivative liabilities: Commodity contracts $ 1,027 $ 151 $ 562 $ 314 Total liabilities $ 1,027 $ 151 $ 562 $ 314 December 31, 2019 (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 20 $ — $ 20 $ — Nuclear trust fund investments: Cash and cash equivalents 17 17 — — U.S. government and federal agency obligations 68 68 — — Federal agency mortgage-backed securities 100 — 100 — Commercial mortgage-backed securities 29 — 29 — Corporate debt securities 109 — 109 — Equity securities 388 388 — — Foreign government fixed income securities 5 — 5 — Other trust fund investments: U.S. government and federal agency obligations 1 1 — — Derivative assets: Commodity contracts 1,170 84 893 193 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 78 Equity securities 8 Total assets $ 1,993 $ 558 $ 1,156 $ 193 Derivative liabilities: Commodity contracts $ 1,103 $ 143 $ 805 $ 155 Total liabilities $ 1,103 $ 143 $ 805 $ 155 The following tables reconcile, for the three and six months ended June 30, 2020 and 2019, the beginning and ending balances for financial instruments that are recognized at fair value in the condensed consolidated financial statements, using significant unobservable inputs: Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Three months ended Six months ended (In millions) Derivatives (a) Derivatives (a) Beginning balance $ 73 $ 38 Total gains realized/unrealized— included in earnings 52 74 Purchases 8 16 Transfers into Level 3 (b) 25 33 Transfers out of Level 3 (b) (6) (9) Ending balance $ 152 $ 152 Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end $ 36 $ 27 (a) Consists of derivative assets and liabilities, net (b) Transfers into/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2 Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Three months ended June 30, 2019 Six months ended June 30, 2019 (In millions) Debt Securities Derivatives (a) Total Debt Securities Derivatives (a) Total Beginning balance $ 18 $ (2) $ 16 19 $ 20 $ 39 Contracts added from acquisitions — (1) (1) — (1) (1) Total gains/(losses) realized/unrealized— included in earnings 1 (17) (16) 1 (27) (26) Cash received — — — (1) — (1) Purchases — (10) (10) — (12) (12) Transfers into Level 3 (b) — 113 113 — 130 130 Transfers out of Level 3 (b) — 14 14 — (13) (13) Ending balance 19 97 116 19 97 116 Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 1 (19) (18) 1 (31) (30) (a) Consists of derivative assets and liabilities, net (b) Transfers into/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2 Derivative Fair Value Measurements A portion of NRG's contracts are exchange-traded contracts with readily available quoted market prices. A majority of NRG's contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available. These contracts are valued based on various valuation techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of the observable market data with similar characteristics. As of June 30, 2020, contracts valued with prices provided by models and other valuation techniques make up 38% of derivative assets and 31% of derivative liabilities. NRG's significant positions classified as Level 3 include physical and financial power executed in illiquid markets, as well as FTRs. The significant unobservable inputs used in developing fair value include illiquid power location pricing, which is derived as a basis to liquid locations. The basis spread is based on observable market data when available or derived from historic prices and forward market prices from similar observable markets when not available. For FTRs, NRG uses the most recent auction prices to derive the fair value. The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of June 30, 2020 and December 31, 2019: June 30, 2020 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Power Contracts $ 431 $ 306 Discounted Cash Flow Forward Market Price (per MWh) $ 4 $ 181 $ 26 FTRs 35 8 Discounted Cash Flow Auction Prices (per MWh) (55) 48 0 $ 466 $ 314 December 31, 2019 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Power Contracts $ 151 $ 139 Discounted Cash Flow Forward Market Price (per MWh) $ 8 $ 218 $ 24 FTRs 42 16 Discounted Cash Flow Auction Prices (per MWh) (105) 213 0 $ 193 $ 155 The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of June 30, 2020 and December 31, 2019: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Power Sell Increase/(Decrease) Lower/(Higher) FTR Prices Buy Increase/(Decrease) Higher/(Lower) FTR Prices Sell Increase/(Decrease) Lower/(Higher) The fair value of each contract is discounted using a risk-free interest rate. In addition, the Company applies a credit reserve to reflect credit risk, which is calculated based on published default probabilities. As of June 30, 2020, the credit reserve resulted in a $1 million decrease in operating revenue and cost of operations. As of December 31, 2019, the credit reserve did not result in a significant change in fair value in operating revenue and cost of operations. Concentration of Credit Risk In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies , to the Company's 2019 Form 10-K, the following is a discussion of the concentration of credit risk for the Company's contractual obligations. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. NRG is exposed to counterparty credit risk through various activities including wholesale sales, fuel purchases and retail supply arrangements, as well as retail customer credit risk through its retail load activities. Counterparty Credit Risk The Company's counterparty credit risk policies are disclosed in its 2019 Form 10-K. As of June 30, 2020, counterparty credit exposure, excluding credit exposure from RTOs, ISOs, registered commodity exchanges and certain long-term agreements, was $339 million and NRG held collateral (cash and letters of credit) against those positions of $76 million, resulting in a net exposure of $263 million. NRG periodically receives collateral from counterparties in excess of their exposure. Collateral amounts shown include such excess while net exposure shown excludes excess collateral received. Approximately 49% of the Company's exposure before collateral is expected to roll off by the end of 2021. Counterparty credit exposure is valued through observable market quotes and discounted at a risk free interest rate. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables. Net Exposure (a)(b) Category by Industry Sector (% of Total) Utilities, energy merchants, marketers and other 77 % Financial institutions 23 Total as of June 30, 2020 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 59 % Non-investment grade/non-rated 41 Total as of June 30, 2020 100 % (a) Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices (b) The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long-term contracts The Company currently has $57 million of exposure to two wholesale counterparties in excess of 10% of total net exposure discussed above as of June 30, 2020. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. Given the credit quality, diversification and term of the exposure in the portfolio, NRG does not anticipate a material impact on its financial position or results of operations from nonperformance by any of NRG's counterparties. RTOs and ISOs The Company participates in the organized markets of CAISO, ERCOT, ISO-NE, MISO, NYISO and PJM, known as RTOs or ISOs. Trading in these markets is approved by FERC, or in the case of ERCOT, approved by the PUCT, and includes credit policies that, under certain circumstances, require that losses arising from the default of one member on spot market transactions be shared by the remaining participants. As a result, the counterparty credit risk to these markets is limited to NRG’s share of the overall market and are excluded from the above exposures. Exchange Traded Transactions The Company enters into commodity transactions on registered exchanges, notably ICE, NYMEX and Nodal. These clearinghouses act as the counterparty and transactions are subject to extensive collateral and margining requirements. As a result, these commodity transactions have limited counterparty credit risk. Long-Term Contracts Counterparty credit exposure described above excludes credit risk exposure under certain long-term contracts, primarily solar PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company values these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of June 30, 2020, aggregate credit risk exposure managed by NRG to these counterparties was approximately $672 million for the next five years. Retail Customer Credit Risk The Company is exposed to retail credit risk through the Company's retail electricity providers, which serve C&I customers and the Mass market. Retail credit risk results in losses when a customer fails to pay for services rendered. The losses may result from both non-payment of customer accounts receivable and the loss of in-the-money forward value. The Company manages retail credit risk through the use of established credit policies that include monitoring of the portfolio and the use of credit mitigation measures such as deposits or prepayment arrangements. As of June 30, 2020, the Company's retail customer credit exposure to C&I and Mass customers was diversified across many customers and various industries, as well as government entities. The Company is also subject to risk with respect to its residential solar customers. Current economic conditions may affect the Company's customers' ability to pay bills in a timely manner, which could increase customer delinquencies and may lead to an increase in credit losses.

Nuclear Decommissioning Trust F

Nuclear Decommissioning Trust Fund	6 Months Ended
	Jun. 30, 2020
Regulated Operations [Abstract]
Nuclear Decommissioning Trust Fund	Nuclear Decommissioning Trust Fund NRG's Nuclear Decommissioning Trust Fund assets, which are for the decommissioning of its 44% interest in STP, are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations , because the Company's nuclear decommissioning activities are subject to approval by the PUCT with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company is in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning is the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund are recorded to the Nuclear Decommissioning Trust liability and are not included in net income or accumulated OCI, consistent with regulatory treatment. The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds, as well as information about the contractual maturities of those securities. As of June 30, 2020 As of December 31, 2019 (In millions, except maturities) Fair Value Unrealized Gains Unrealized Losses Weighted-average Maturities (In years) Fair Value Unrealized Gains Unrealized Losses Weighted-average Maturities (In years) Cash and cash equivalents $ 26 $ — $ — — $ 17 $ — $ — — U.S. government and federal agency obligations 48 8 — 13 68 4 — 11 Federal agency mortgage-backed securities 87 4 — 24 100 3 — 24 Commercial mortgage-backed securities 38 2 — 27 29 1 1 24 Corporate debt securities 148 12 1 12 109 6 — 11 Equity securities 440 298 — — 466 324 — — Foreign government fixed income securities 7 1 — 10 5 — — 10 Total $ 794 $ 325 $ 1 $ 794 $ 338 $ 1 The following table summarizes proceeds from sales of available-for-sale securities held in the trust funds and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method. Six months ended June 30, (In millions) 2020 2019 Realized gains $ 7 $ 5 Realized losses (9) (5) Proceeds from sale of securities 220 191

Accounting for Derivative Instr

Accounting for Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accounting for Derivative Instruments and Hedging Activities	Accounting for Derivative Instruments and Hedging Activities Energy-Related Commodities As of June 30, 2020, NRG had energy-related derivative instruments extending through 2034. The Company marks these derivatives to market through the statement of operations. NRG has executed power purchase agreements extending through 2037 that qualified for the NPNS exception and were therefore exempt from fair value accounting treatment. Interest Rate Swaps NRG was exposed to changes in interest rates through the Company's issuance of variable rate debt. In order to manage the Company's interest rate risk, NRG entered into interest rate swap agreements. As of June 30, 2020, NRG had no interest rate derivative instruments as a result of the early termination of such contracts in connection with the repayment of the 2023 Term Loan Facility during the second quarter of 2019. Volumetric Underlying Derivative Transactions The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception, as of June 30, 2020 and December 31, 2019. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date. Total Volume (In millions) Category Units June 30, 2020 December 31, 2019 Emissions Short Ton 1 3 Renewable Energy Certificates Certificates 1 1 Coal Short Ton 5 10 Natural Gas MMBtu (237) (181) Power MWh 56 38 Capacity MW/Day (1) (1) Fair Value of Derivative Instruments The following table summarizes the fair value within the derivative instrument valuation on the balance sheets: Fair Value Derivative Assets Derivative Liabilities (In millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Commodity contracts current $ 791 $ 860 $ 728 $ 781 Commodity contracts long-term 439 310 299 322 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 1,230 $ 1,170 $ 1,027 $ 1,103 The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. In addition, collateral received or paid on the Company's derivative assets or liabilities are recorded on a separate line item on the balance sheet. The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid: Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of June 30, 2020 Commodity contracts: Derivative assets $ 1,230 $ (921) $ (22) $ 287 Derivative liabilities (1,027) 921 38 (68) Total commodity contracts $ 203 $ — $ 16 $ 219 Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of December 31, 2019 Commodity contracts: Derivative assets $ 1,170 $ (909) $ (7) $ 254 Derivative liabilities (1,103) 909 73 (121) Total commodity contracts $ 67 $ — $ 66 $ 133 Impact of Derivative Instruments on the Statements of Operations Unrealized gains and losses associated with changes in the fair value of derivative instruments not accounted for as cash flow and fair value hedges are reflected in current period results of operations. The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges or fair value hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense. (In millions) Three months ended June 30, Six months ended June 30, Unrealized mark-to-market results 2020 2019 2020 2019 Reversal of previously recognized unrealized losses on settled positions related to economic hedges $ 30 $ 11 $ 39 $ 30 Reversal of acquired loss/(gain) positions related to economic hedges 3 1 4 (1) Net unrealized gains on open positions related to economic hedges 54 9 88 12 Total unrealized mark-to-market gains for economic hedging activities 87 21 131 41 Reversal of previously recognized unrealized (gains) on settled positions related to trading activity (5) (1) (7) (7) Net unrealized gains on open positions related to trading activity 4 13 17 26 Total unrealized mark-to-market (losses)/gains for trading activity (1) 12 10 19 Total unrealized gains $ 86 $ 33 $ 141 $ 60 Three months ended June 30, Six months ended June 30, (In millions) 2020 2019 2020 2019 Unrealized gains included in operating revenues $ 42 $ 253 $ 49 $ 280 Unrealized gains/(losses) included in cost of operations 44 (220) 92 (220) Total impact to statement of operations — energy commodities $ 86 $ 33 $ 141 $ 60 Total impact to statement of operations — interest rate contracts $ — $ (29) $ — $ (38) The reversals of acquired gain or loss positions were valued based upon the forward prices on the acquisition date. The roll-off amounts were offset by realized gains or losses at the settled prices and are reflected in operating revenue or cost of operations during the same period. For the six months ended June 30, 2020, the $88 million unrealized gain from open economic hedge positions was primarily the result of an increase in value of forward positions as a result of increases in outer year ERCOT power prices and decreases in New York capacity, New York power, and West/Other power prices. For the six months ended June 30, 2019, the $12 million unrealized gain from open economic hedge positions was primarily the result of an increase in value of forward power positions due to a decrease in power prices. Credit Risk Related Contingent Features Certain of the Company's hedging agreements contain provisions that require the Company to post additional collateral if the counterparty determines that there has been deterioration in credit quality, generally termed “adequate assurance” under the agreements, or require the Company to post additional collateral if there were a downgrade in the Company's credit rating. The collateral required for contracts with adequate assurance clauses that are in a net liability position as of June 30, 2020 was $33 million. The Company is also party to certain marginable agreements under which it has net liability position, but the counterparty has not called for the collateral due, which was $8 million as of June 30, 2020. There will be no additional collateral required for all contracts with credit rating contingent features as of June 30, 2020. See Note 5, Fair Value of Financial Instruments , for discussion regarding concentration of credit risk.

Impairments

Impairments	6 Months Ended
	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Impairments	Impairments Petra Nova Parish Holdings — During the first quarter of 2020, due to the decline in oil prices, NRG determined that the carrying amount of the Company’s equity method investment exceeded the fair value of the investment and that the decline is considered to be other-than-temporary. In determining the fair value, the Company utilized an income approach to estimate future project cash flows. The Company recorded an impairment loss of $18 million in the Texas segment, which included the anticipated drawdown of the $12 million letter of credit posted in September 2019 to cover certain project debt reserve requirements.

Long-term Debt

Long-term Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt Long-term debt consisted of the following: (In millions, except rates) June 30, 2020 December 31, 2019 Interest rate % Recourse debt: Senior Notes, due 2026 $ 1,000 $ 1,000 7.250 Senior Notes, due 2027 1,230 1,230 6.625 Senior Notes, due 2028 821 821 5.750 Senior Notes, due 2029 733 733 5.250 Convertible Senior Notes, due 2048 (a) 575 575 2.750 Senior Secured First Lien Notes, due 2024 600 600 3.750 Senior Secured First Lien Notes, due 2029 500 500 4.450 Revolving Credit Facility (b) — 83 L+ 1.750 Tax-exempt bonds 466 466 1.30 - 6.00 Subtotal recourse debt 5,925 6,008 Non-recourse debt: Other 32 34 various Subtotal all non-recourse debt 32 34 Subtotal long-term debt (including current maturities) 5,957 6,042 Less current maturities (7) (88) Less debt issuance costs (61) (65) Discounts (79) (86) Total long-term debt $ 5,810 $ 5,803 (a) As of July 31, 2020, the Convertible Notes were convertible at a price of $46.65, which is equivalent to a conversion rate of approximately 21.44 shares of common stock per $1,000 principal amount. (b) As of December 31, 2019, the Company had drawn under its Revolving Credit Facility at 1-week LIBOR + 1.750 Recourse Debt Revolving Credit Facility The Company had $83 million outstanding under its Revolving Credit Facility as of December 31, 2019, which was used to repay the outstanding indebtedness on the Agua Caliente Borrower 1 notes on a leverage-neutral basis during the fourth quarter of 2019. Due to market conditions, primarily as a result of COVID-19, the Company drew upon the facility in the first quarter of 2020 as a precaution and to proportionally increase cash on hand, and fully repaid the outstanding borrowings during the second quarter of 2020. Tax-Exempt Bonds On March 11, 2020, NRG issued $59 million in aggregate principal amount of NRG Dunkirk 2020 1.30% tax-exempt refinancing bonds due 2042 ("the Bonds"). The Bonds are guaranteed on a first-priority basis by each of NRG’s current and future subsidiaries that guarantee indebtedness under its credit agreement. The Bonds are secured by a first priority security interest in the same collateral that is pledged for the benefit of the lenders under NRG’s credit agreement, which consists of a substantial portion of the property and assets owned by NRG and the guarantors. The collateral securing the Bonds will, at the request of NRG, be released if NRG satisfies certain conditions, including receipt of an investment grade rating on its senior, unsecured debt securities from two out of the three rating agencies, subject to reversion if those rating agencies withdraw their investment grade rating of the Bonds or any of NRG’s senior, unsecured debt securities or downgrade such rating below investment grade. The Bonds are subject to mandatory tender and purchase on April 3, 2023 and have a final maturity date of April 1, 2042. NRG used the net proceeds from the offering to redeem the existing principal amount of outstanding Dunkirk Power LLC 5.875% tax exempt bonds due 2042. Non-Recourse Debt Cottonwood - Letters of Credit On January 4, 2019, the Company entered into an $80 million credit agreement to issue letters of credit, which is currently supporting the Cottonwood facility lease. Annual fees of 1.33% on the facility are paid quarterly in advance. As of June 30, 2020, the full $80 million was issued.

Investments Accounted for Using

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs	6 Months Ended
	Jun. 30, 2020
Variable Interest Entities Disclosure [Abstract]
Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs	Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs Entities that are not Consolidated NRG accounts for the Company's significant investments using the equity method of accounting. NRG's carrying value of equity investments can be impacted by a number of elements including impairments, unrealized gains and losses on derivatives and movements in foreign currency exchange rates. PG&E Bankruptcy — Agua Caliente and two of the three Ivanpah units are party to PPAs with PG&E. Both projects have project financing with the U.S. DOE. On January 29, 2019, PG&E Corp. and primary operating subsidiary utility PG&E filed for Chapter 11 relief in the California Bankruptcy Court. As a result of the bankruptcy filing, Agua Caliente and the two Ivanpah units were issued notices of events of default under their respective loan agreements. On September 9, 2019, PG&E filed a plan of reorganization that would assume all power purchase agreements, including those held by Agua Caliente and the two Ivanpah units. The California Bankruptcy Court approved the PG&E plan and the Confirmation Order was entered on June 19, 2020. The plan went effective, and PG&E emerged from bankruptcy on July 1, 2020. On July 22, 2020 and July 24, 2020, the U.S. DOE agreed to waivers of the bankruptcy-related events of default with respect to the Agua Caliente and Ivanpah projects, respectively. The Company is working with the U.S. DOE and the partners on the Agua Caliente and Ivanpah projects to resume distributions from the projects in the near future. NRG renewed its efforts to sell its 35% interest in Agua Caliente in July 2020, following PG&E's emergence from bankruptcy. NRG's maximum exposure to loss is limited to its equity investment, which was $220 million for Agua Caliente and $10 million for Ivanpah as of June 30, 2020. Variable Interest Entities that are Consolidated The Company has a controlling financial interest in certain entities that have been identified as VIEs under ASC 810. These arrangements are primarily related to tax equity arrangements entered into with third-parties in order to finance the cost of solar energy systems under operating leases eligible for certain tax credits as further described in Note 2, Summary of Significant Accounting Policies, to the Company's 2019 Form 10-K. During the first quarter of 2020, the Company repurchased its partners' equity interest in one of the partnerships. As the Company retains control of its interest, the repurchase was recorded to equity. The summarized financial information for the Company's consolidated VIEs consisted of the following: (In millions) June 30, 2020 December 31, 2019 Current assets $ 1 $ 3 Net property, plant and equipment — 71 Other long-term assets 25 27 Total assets 26 101 Current liabilities 4 4 Long-term debt 24 24 Other long-term liabilities 4 8 Total liabilities 32 36 Redeemable noncontrolling interest — 20 Net assets less noncontrolling interest $ (6) $ 45

Changes in Capital Structure

Changes in Capital Structure	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Changes in Capital Structure	Changes in Capital Structure As of June 30, 2020 and December 31, 2019, the Company had 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's common stock issued and outstanding: Issued Treasury Outstanding Balance as of December 31, 2019 421,890,790 (172,894,601) 248,996,189 Shares issued under LTIPs 1,140,987 — 1,140,987 Shares issued under ESPP — 63,455 63,455 Shares repurchased — (6,062,783) (6,062,783) Balance as of June 30, 2020 423,031,777 (178,893,929) 244,137,848 Share Repurchases The Company adopted, in the fourth quarter of 2019, a long-term capital allocation policy that targets allocating 50% of cash available for allocation generated each year to growth investments and 50% to be returned to shareholders. The return of capital to shareholders is expected to be completed through the increased dividend discussed below, supplemented by share repurchases. The following repurchases have been made during the six months ended June 30, 2020: Total number of shares purchased Average price paid per share Amounts paid for shares purchased (in millions) 2020 repurchases: Repurchases 6,062,783 $ 197 Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances (a) 710,474 27 Total Share Repurchases during the six months ended June 30, 2020 6,773,257 $33.05 $ 224 (a) NRG elected to pay cash for tax withholding on equity awards instead of issuing actual shares to management. The average price per equivalent shares withheld was $38.24 Employee Stock Purchase Plan In March 2019, the Company reopened participation in the ESPP, which allows eligible employees to elect to withhold between 1% and 10% of their eligible compensation to purchase shares of NRG common stock at the lesser of 95% of its market value on the offering date or 95% of the fair market value on the exercise date. An offering date will occur each April 1 and October 1. An exercise date will occur each September 30 and March 31. NRG Common Stock Dividends Beginning in the first quarter of 2020, NRG increased the annual dividend to $1.20 from $0.12 per share and expects to target an annual dividend growth rate of 7-9% per share in subsequent years. A quarterly dividend of $0.30 per share was paid on the Company's common stock during the three months ended June 30, 2020. On July 17, 2020, NRG declared a quarterly dividend on the Company's common stock of $0.30 per share, payable August 17, 2020 to stockholders of record as of August 3, 2020.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic income per common share is computed by dividing net income by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the year are weighted for the portion of the year that they were outstanding. Diluted income per share is computed in a manner consistent with that of basic income per share while giving effect to all potentially dilutive common shares that were outstanding during the period. The outstanding non-qualified stock options, non-vested restricted stock units, market stock units, and relative performance stock units are not considered outstanding for purposes of computing basic income per share. However, these instruments are included in the denominator for purposes of computing diluted income per share under the treasury stock method. The Convertible Senior Notes are convertible, under certain circumstances, into the Company’s common stock, cash or combination thereof (at NRG's option). There is no dilutive effect for the Convertible Senior Notes due to the Company’s expectation to settle the liability in cash. The reconciliation of NRG's basic and diluted income per share is shown in the following table: Three months ended June 30, Six months ended June 30, (In millions, except per share data) 2020 2019 2020 2019 Basic income per share: Net income available to common shareholders $ 313 $ 201 $ 434 $ 683 Weighted average number of common shares outstanding - basic 245 265 246 272 Income per weighted average common share — basic $ 1.28 $ 0.76 $ 1.76 $ 2.51 Diluted income per share: Net income available to common shareholders $ 313 $ 201 $ 434 $ 683 Weighted average number of common shares outstanding - basic 245 265 246 272 Incremental shares attributable to the issuance of equity compensation (treasury stock method) 1 2 1 2 Weighted average number of common shares outstanding - dilutive 246 267 247 274 Income per weighted average common share — diluted $ 1.27 $ 0.75 $ 1.76 $ 2.49

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting As part of perfecting the integrated model, in which the majority of the Company’s generation serves its retail customers, the Company began managing its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus in 2020. As a result, the Company changed its business segments from Retail and Generation to Texas, East and West/Other beginning in the first quarter of 2020, as further described in Note 1, Nature of Business . The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources The financial information for the three and six months ended June 30, 2019 was recast to reflect the current segment structure. In February 2019, as described in Note 4, Acquisitions, Discontinued Operations and Dispositions , the Company completed the sales of the South Central Portfolio and Carlsbad. The financial information for the three and six months ended June 30, 2019 presented below reflects the presentation of these entities as discontinued operations within the corporate segment. NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, free cash flow and allocation of capital, as well as net income/(loss). Three months ended June 30, 2020 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 1,578 $ 566 $ 94 $ — $ — $ 2,238 Depreciation and amortization 59 33 8 10 — 110 Equity in (losses)/earnings of unconsolidated affiliates (3) — 15 — — 12 Income/(loss) from continuing operations before income taxes 350 146 26 (109) 1 414 Income/(loss) from continuing operations 350 146 25 (209) 1 313 Net income/(loss) attributable to NRG Energy, Inc $ 350 $ 146 $ 25 $ (209) $ 1 $ 313 Three months ended June 30, 2019 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 1,837 $ 524 $ 106 $ 1 $ (3) $ 2,465 Depreciation and amortization 40 30 7 8 — 85 Impairment losses 1 — — — — 1 Reorganization costs 3 — — (1) — 2 Gain on sale of assets — — — 1 — 1 Equity in (losses)/earnings of unconsolidated affiliates (3) — 3 — — — Loss on debt extinguishment, net — — — (47) — (47) Income/(loss) from continuing operations before income taxes 259 60 18 (149) — 188 Income/(loss) from continuing operations 259 60 18 (148) — 189 Income from discontinued operations, net of tax — — — 13 — 13 Net income/(loss) 259 60 18 (135) — 202 Net income/(loss) attributable to NRG Energy, Inc. $ 259 $ 60 $ 17 $ (135) $ — $ 201 Six months ended June 30, 2020 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 2,936 $ 1,105 $ 219 $ — $ (3) $ 4,257 Depreciation and amortization 118 66 16 19 — 219 Reorganization costs 1 — — 2 — 3 Gain on sale of assets — — 1 5 — 6 Equity in (losses)/earnings of unconsolidated affiliates (3) — 4 — — 1 Impairment losses on investments (18) — — — — (18) Loss on debt extinguishment, net — (1) — — — (1) Income/(loss) from continuing operations before income taxes 512 170 67 (191) — 558 Income/(loss) from continuing operations 512 170 66 (314) — 434 Net income/(loss) attributable to NRG Energy, Inc $ 512 $ 170 $ 66 $ (314) $ — $ 434 Six months ended June 30, 2019 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 3,303 $ 1,133 $ 199 $ — $ (5) $ 4,630 Depreciation and amortization 80 56 18 16 — 170 Impairment losses 1 — — — — 1 Reorganization costs 4 — — 11 — 15 Gain on sale of assets — 1 — 1 — 2 Equity in (losses) of unconsolidated affiliates (6) — (15) — — (21) Loss on debt extinguishment, net — — — (47) — (47) Income/(loss) from continuing operations before income taxes 409 159 (5) (276) (1) 286 Income/(loss) from continuing operations 409 159 (5) (279) (1) 283 Income from discontinued operations, net of tax — — — 401 — 401 Net income/(loss) 409 159 (5) 122 (1) 684 Net income/(loss) attributable to NRG Energy, Inc. $ 409 $ 159 $ (6) $ 122 $ (1) $ 683

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Income Tax Rate The income tax provision consisted of the following: Three months ended June 30, Six months ended June 30, (In millions, except rates) 2020 2019 2020 2019 Income from continuing operations before income taxes $ 414 $ 188 $ 558 $ 286 Income tax expense/(benefit) from continuing operations 101 (1) 124 3 Effective income tax rate 24.4 % (0.5) % 22.2 % 1.0 % For the three and six months ended June 30, 2020, the effective tax rates were higher than the statutory rate of 21% due to state tax expense partially offset by an excess tax benefit related to share-based compensation. For the same periods in 2019, the effective tax rates were lower than the statutory rate of 21% primarily due to the tax benefit for the change in valuation allowance partially offset by state tax expense. On March 27, 2020, the Senate passed the CARES Act to provide emergency relief related to the COVID-19 pandemic. The CARES Act contains federal income tax provisions which, among other things: (i) increases the amount of interest expense that businesses are allowed to deduct by increasing the adjusted taxable income limitation from 30% to 50% for tax years that begin in 2019 and 2020; (ii) permits businesses to carry back to each of the five tax years NOLs arising from tax years beginning after December 31, 2017 and before January 1, 2020; and (iii) temporarily removes the 80% limitation on NOLs until tax years beginning after 2020. NRG does not expect the CARES Act provisions to have a material impact on the tax positions of the Company. Uncertain Tax Benefits As of June 30, 2020, NRG had a non-current tax liability of $18 million for uncertain tax benefits from positions taken on various state income tax returns and accrued interest. For the six months ended June 30, 2020, NRG accrued an immaterial amount of interest relating to the uncertain tax benefits. As of June 30, 2020, NRG had cumulative interest and penalties related to these uncertain tax benefits of $2 million. The Company recognizes interest and penalties related to uncertain tax benefits in income tax expense. NRG is subject to examination by taxing authorities for income tax returns filed in the U.S. federal jurisdiction and various state and foreign jurisdictions including operations located in Australia and Canada. The Company is no longer subject to U.S. federal income tax examinations for years prior to 2016. With few exceptions, state and local income tax examinations are no longer open for years prior to 2011.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions NRG provides services to some of its equity method investments under operations and maintenance agreements. Fees for the services under these agreements include recovery of NRG's costs of operating the plants. Certain agreements also include fees for administrative service, a base monthly fee, profit margin and/or annual incentive bonus. The following table summarizes NRG's material related party transactions with third party affiliates: Three months ended June 30, Six months ended June 30, (In millions) 2020 2019 2020 2019 Revenues from Related Parties Included in Operating Revenues Gladstone $ — $ 1 $ 1 $ 1 Ivanpah (a) 10 7 23 18 Midway-Sunset 2 1 3 2 Total $ 12 $ 9 $ 27 $ 21 (a) Also includes fees under project management agreements with each project company

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments First Lien Structure NRG has granted first liens to certain counterparties on a substantial portion of property and assets owned by NRG and the guarantors of its senior debt. NRG uses the first lien structure to reduce the amount of cash collateral and letters of credit that it would otherwise be required to post from time to time to support its obligations under out-of-the-money hedge agreements for forward sales of power or gas used as a proxy for power. To the extent that the underlying hedge positions for a counterparty are out-of-the-money to NRG, the counterparties would have a claim under the first lien program. As of June 30, 2020, all hedges under the first lien were in-the-money for NRG on a counterparty aggregate basis. Jewett Mine Lignite Contract The Company's Limestone facility historically burned lignite obtained from the Jewett mine, which was operated by TWCC. On or about March 15, 2019, the Jewett mine and related lignite supply agreement with NRG were acquired by Westmoreland Jewett Mining LLC ("Jewett Mining"), a subsidiary of Westmoreland Mining LLC pursuant to a plan of reorganization confirmed by the Texas Bankruptcy Court. Effective August 5, 2020, NRG's subsidiary, NRG Texas LLC, acquired all of the equity interests of Jewett Mining. Active mining under the lignite supply agreement ceased as of December 31, 2016; however, under the terms of the lignite supply agreement, Jewett Mining remains responsible for undertaking reclamation activities and NRG is responsible for all reclamation costs. NRG has recorded an adequate ARO liability. The Railroad Commission of Texas has imposed a bond obligation of approximately $99 million for the reclamation of the Jewett mine, which NRG supports through surety bonds. The cost of the reclamation may exceed the value of the bonds. Additionally, the lignite supply agreement obligates NRG to provide additional performance assurance if required by the Railroad Commission of Texas. Contingencies The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. NRG records accruals for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Company has established an adequate accrual for the applicable legal matters, including regulatory and environmental matters as further discussed in Note 17, Regulatory Matters , and Note 18, Environmental Matters . In addition, legal costs are expensed as incurred. Management has assessed each of the following matters based on current information and made a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. Unless specified below, the Company is unable to predict the outcome of these legal proceedings or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded accruals and that such difference could be material. In addition to the legal proceedings noted below, NRG and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows. Washington-St. Tammany and Claiborne Electric Cooperative v. LaGen — On June 28, 2017, plaintiffs Washington-St. Tammany Electric Cooperative, Inc. and Claiborne Electric Cooperative, Inc. filed a lawsuit against LaGen in the United States District Court for the Middle District of Louisiana. The plaintiffs claimed breach of contract against LaGen for allegedly improperly charging the plaintiffs for costs related to the installation and maintenance of certain pollution control technology. Plaintiffs sought damages for the alleged improper charges and a declaration as to which charges were proper under the contract. In February 2020, the court dismissed this lawsuit without prejudice for lack of subject matter jurisdiction. This matter had been appealed to the United States Court of Appeals for the Fifth Circuit, which dismissed the appeals on July 13, 2020. On March 17, 2020, plaintiffs filed a lawsuit in the Nineteenth Judicial District Court for the Parish of East Baton Rouge in Louisiana alleging substantially the same matters. On February 4, 2019, NRG sold the South Central Portfolio, including the entities subject to this litigation. However, NRG has agreed to indemnify the purchaser for certain losses suffered in connection therewith. Sierra club et al. v. Midwest Generation LLC — In 2012, several environmental groups filed a complaint against Midwest Generation with the Illinois Pollution Control Board ("IPCB") alleging violations of environmental law resulting in groundwater contamination. In June 2019, the IPCB found that Midwest Generation violated the law because it had improperly handled coal ash at four facilities in Illinois and caused or allowed coal ash constituents to impact groundwater. On September 9, 2019, Midwest Generation filed a Motion to Reconsider numerous issues, which the court granted in part and denied in part on February 6, 2020. The IPCB will hold hearings to determine the appropriate relief. Midwest Generation has been working with the Illinois EPA to address the groundwater issues since 2010. XOOM Energy Litigation — XOOM is a defendant in two purported class action lawsuits pending in Maryland and New York. The plaintiffs generally claim that they did not receive the savings they were promised in their natural gas and electricity bills. The parties in the Maryland lawsuit are briefing summary judgment and class certification. In the New York case, XOOM filed a motion to dismiss, which the court granted on September 21, 2018, later entering judgment in XOOM's favor on September 24, 2018. The plaintiffs in the New York case appealed to the U.S. Court of Appeals for the Second Circuit. On July 26, 2019, the Second Circuit reversed the judgment of the district court and remanded to the district court with instructions that plaintiffs be permitted to proceed on their proposed amended complaint. This matter was known and accrued for at the time of the acquisition.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2020
Regulatory Matters Disclosure [Abstract]
Regulatory Matters	Regulatory Matters Environmental regulatory matters are discussed within Note 18, Environmental Matters. NRG operates in a highly regulated industry and is subject to regulation by various federal and state agencies. As such, NRG is affected by regulatory developments at both the federal and state levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG's businesses. In addition to the regulatory proceedings noted below, NRG and its subsidiaries are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows. California Station Power — As the result of unfavorable final and non-appealable litigation, the Company accrued a liability associated with consumption of station power at the Company's Encina power plant facility in California after August 30, 2010. The Company has established an appropriate accrual pending potential regulatory action by San Diego Gas & Electric regarding the Company's Encina facility. South Central — On August 4, 2016, NRG received a document hold notice from FERC regarding conduct in the MISO and PJM markets. It required NRG to retain communications related to multiple generating units in the South Central region. Since sending the notice, FERC has been investigating potential violations of MISO rules involving bidding for the Big Cajun 2 facility, as well as other aspects of NRG’s operations in MISO. FERC has the authority to require disgorgement of profits and to impose penalties and NRG retains any liability following the sale of the South Central Portfolio. The Company expects a preliminary finding from FERC in 2020. ISO-NE — On February 5, 2019, FERC has informed the Company that it has made a preliminary finding that the Company violated FERC's market behavior rules in connection with offers made into the ISO-NE Forward Capacity Auction in 2016. On April 26, 2019, NRG responded to the preliminary findings. The Company understands that FERC is concerned that the Company was inaccurate in its communications with the Market Monitor regarding the costs and risks associated with operating certain units in the forward timeframe. NRG withdrew the bids prior to the 2016 auction in the normal course of its commercial business decision making.

Environmental Matters

Environmental Matters	6 Months Ended
	Jun. 30, 2020
Environmental Matters Disclosure [Abstract]
Environmental Matters	Environmental Matters NRG is subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. NRG is also subject to laws regarding the protection of wildlife, including migratory birds, eagles and threatened and endangered species. The electric generation industry has been facing requirements regarding GHGs, combustion byproducts, water discharge and use, and threatened and endangered species that have been put in place in recent years. However, under the current U.S. presidential administration, some of these rules are being reconsidered and reviewed. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose certain restrictions on the operations of the Company's facilities, which could have a material effect on the Company's consolidated financial position, results of operations, or cash flows. Federal and state environmental laws generally have become more stringent over time, although this trend could slow or pause in the near term with respect to federal laws under the current U.S. presidential administration. Air On July 8, 2019, EPA promulgated the ACE rule, which rescinded the CPP, which had sought to broadly regulate CO 2 emissions from the power sector. The ACE rule requires states that have coal-fired EGUs to develop plans to seek heat rate improvements from coal-fired EGUs. Numerous parties have challenged the ACE rule in the D.C. Circuit and numerous parties have filed petitions for reconsideration with the EPA. Water Effluent Limitations Guidelines — In November 2015, the EPA revised the Effluent Limitations Guidelines for Steam Electric Generating Facilities, which would have imposed more stringent requirements (as individual permits were renewed) for wastewater streams from FGD, fly ash, bottom ash, and flue gas mercury control. On September 18, 2017, the EPA promulgated a final rule that, among other things, postpones the compliance dates to preserve the status quo for FGD wastewater and bottom ash transport water by two years to November 2020 until the EPA completes its next rulemaking. On April 12, 2019, the United States Court of Appeals for the Fifth Circuit addressed challenges to the rule brought by several environmental groups related to legacy wastewaters and coal ash leachate and remanded portions of the rule to the EPA. On November 22, 2019, the EPA proposed amending the 2015 ELG rule by: (x) decreasing the stringency of the selenium limit (but increasing the stringency of the nitrate and mercury limits) for FGD wastewater; (y) relaxing the zero-discharge requirement for bottom ash transport water; and (z) changing several deadlines. The Company has eliminated its estimate of the environmental capital expenditures that was anticipated. The Company will revisit these estimates after the rule is revised and as permits are renewed. Byproducts, Wastes, Hazardous Materials and Contamination In April 2015, the EPA finalized the rule regulating byproducts of coal combustion (e.g., ash and gypsum) as solid wastes under the RCRA. In September 2017, the EPA agreed to reconsider the rule. On July 30, 2018, the EPA promulgated a rule that amends the existing ash rule by extending some of the deadlines and providing more flexibility for compliance. On August 21, 2018, the D.C. Circuit found, among other things, that the EPA had not adequately regulated unlined ponds and legacy ponds. On August 14, 2019, the EPA proposed targeted changes to the April 2015 Rule including changes to address the August 2018 D.C. Circuit decision. On December 2, 2019, the EPA released for comment "Closure Part A Proposal" to revise the CCR Rule to address the D.C. Circuit's 2018 decision regarding the adequacy of clay-lined impoundments, obligations to close all unlined impoundments and related deadlines. On February 20, 2020, the EPA proposed the framework for developing and implementing a federal permit program for states that are not approved to administer the CCR rule. On March 3, 2020, the EPA proposed for comment "A Holistic Approach to Closure Part B," which proposes procedures for obtaining approval to operate existing impoundments with alternative liners. On July 29, 2020, the EPA released a prepublication (non-official) version of the final rule "A Holistic Approach to Closure Part A: Deadline to Initiate Closure," which when published in the Federal Register will amend the April 2015 Rule to address the August 2018 D.C. Circuit decision and extend some of the deadlines. The Company anticipates that the EPA will promulgate additional regulations to further amend the existing rule. The Company will update estimates of required environmental capital expenditures as the rule is revised.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Direct Energy Acquisition On July 24, 2020, the Company entered into a definitive purchase agreement with Centrica to acquire Direct Energy, a North American subsidiary of Centrica (the "Purchase Agreement"). Direct Energy is a leading retail provider of electricity, natural gas, and home and business energy related products and services in North America, with operations in all 50 U.S. states and 6 Canadian provinces. The acquisition will add over 3 million customers to NRG's business and build on and complement its integrated model, enabling better matching of power generation with customer demand. It will also broaden the Company's presence in the Northeast and into states and locales where it does not currently operate, supporting NRG's objective to diversify its business. The Company will pay an aggregate purchase price of $3.6 billion in cash, subject to a purchase price adjustment, including a working capital adjustment. The Company expects to fund the purchase price using a combination of cash on hand, approximately $2.4 billion in newly-issued secured and unsecured corporate debt and approximately $750 million in convertible preferred stock or other equity-linked instruments. The Company also expects to increase its collective collateral facilities by $3.5 billion through a combination of new letter of credit facilities and increase to the existing Revolving Credit Facility. The acquisition is subject to approval by the shareholders of Centrica, as well as customary closing conditions, consents and regulatory approvals, including the expiration or termination of the applicable waiting period under the HSR Act, and the receipt of approvals or expiration of applicable waiting periods under the Federal Power Act and the Canadian Competition Act. The acquisition is targeted to close by December 31, 2020. There are no assurances that the conditions to the consummation of the acquisition of Direct Energy will be satisfied, that Centrica will not seek or enter into an alternative transaction as discussed below, or that the acquisition of Direct Energy will be consummated on the terms agreed to, or at all. Prior to the approval of the transaction by its shareholders, Centrica is permitted to respond to unsolicited acquisition proposals that constitute or are reasonably likely to lead to a superior proposal, and to engage in negotiations with, and provide information to, parties that submit these proposals. Centrica can terminate the Purchase Agreement to accept a superior proposal. In addition, the board of directors of Centrica can change its recommendation in favor of NRG's transaction if the failure to do so would be inconsistent with the fiduciary duties of the Centrica directors, in which case the Purchase Agreement would automatically terminate. In the event of a termination of the Purchase Agreement in connection with (i) Centrica's decision to accept a superior proposal, (ii) the failure to obtain Centrica shareholder approval, or (iii) a change of recommendation by the Centrica board, Centrica would be obligated to pay NRG a termination fee of approximately $30 million. NRG will be required to pay Centrica a termination fee of $180 million if the Purchase Agreement is terminated (i) by either Centrica or NRG because the transaction has not been completed by July 24, 2021 (as such date may be extended for two separate three month periods if necessary to obtain required regulatory approvals, through January 24, 2022), and at the time of termination all of the mutual conditions to the obligations of NRG and Centrica to close the acquisition, and all the conditions to NRG's obligations to close the acquisition, have been satisfied other than receipt of the required antitrust and competition approvals, (ii) by either Centrica or NRG if a governmental entity has issued a judgment with respect to an antitrust or competition law that permanently prohibits the completion of the transaction and the judgment has become final and non-appealable, (iii) by NRG if a governmental entity has imposed a condition on its willingness to approve the acquisition on antitrust or competition grounds and the condition has a material adverse effect as described in the Purchase Agreement or (iv) by Centrica because NRG has breached its obligations under the Purchase Agreement to seek to obtain the antitrust and competition approvals required to complete the transaction. Midwest Generation Lease Purchase On July 22, 2020, Midwest Generation signed purchase agreements to acquire all of the ownership interests in the Powerton facility and Units 7 and 8 of the Joliet facility, which were being leased through 2034 and 2030, respectively, for approximately $260 million. The Company intends to fund the purchase with borrowings under its Revolving Credit Facility in an amount equal to the existing operating lease liabilities of $148 million as of June 30, 2020 and the remainder from cash-on-hand. The closing is conditioned, among other items, on the receipt of regulatory approvals from FERC and under the HSR Act.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	6 Months Ended
	Jun. 30, 2020
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Consolidating Financial Information	Condensed Consolidating Financial Information As of June 30, 2020, the Company had outstanding $4.4 billion of Senior Notes and Convertible Senior Notes due from 2026 to 2048 and outstanding $1.1 billion of Senior Secured Notes due from 2024 to 2029, as shown in Note 9, Long-term Debt . These Senior Notes and Senior Secured Notes are guaranteed by certain of NRG's current and future 100% owned domestic subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include all of NRG's foreign subsidiaries and certain domestic subsidiaries. Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes, Convertible Senior Notes and Senior Secured Notes as of June 30, 2020: Ace Energy, Inc. NRG Distributed Energy Resources Holdings LLC Reliant Energy Retail Services, LLC Allied Home Warranty GP LLC NRG Distributed Generation PR LLC RERH Holdings, LLC Allied Warranty LLC NRG Dunkirk Operations Inc. Saguaro Power LLC Arthur Kill Power LLC NRG ECOKAP Holdings LLC SGE Energy Sourcing, LLC Astoria Gas Turbine Power LLC NRG El Segundo Operations Inc. SGE Texas Holdco, LLC BidURenergy, Inc. NRG Energy Labor Services LLC Somerset Operations Inc. Cabrillo Power I LLC NRG Energy Services Group LLC Somerset Power LLC Cabrillo Power II LLC NRG Energy Services LLC Stream Energy Columbia, LLC Carbon Management Solutions LLC NRG Generation Holdings Inc. Stream Energy Delaware, LLC Cirro Energy Services, Inc. NRG Greenco LLC Stream Energy Illinois, LLC Cirro Group, Inc. NRG Home & Business Solutions LLC Stream Energy Maryland, LLC Connecticut Jet Power LLC NRG Home Services LLC Stream Energy New Jersey, LLC Devon Power LLC NRG Home Solutions LLC Stream Energy New York, LLC Dunkirk Power LLC NRG Home Solutions Product LLC Stream Energy Pennsylvania, LLC Eastern Sierra Energy Company LLC NRG Homer City Services LLC Stream Georgia Gas SPE, LLC El Segundo Power II LLC NRG HQ DG LLC Stream Ohio Gas & Electric, LLC El Segundo Power, LLC NRG Huntley Operations Inc. Stream SPE GP, LLC Energy Alternatives Wholesale, LLC NRG Identity Protect LLC Stream SPE, Ltd. Energy Choice Solutions LLC NRG Ilion Limited Partnership Texas Genco GP, LLC Energy Plus Holdings LLC NRG Ilion LP LLC Texas Genco Holdings, Inc. Energy Plus Natural Gas LLC NRG International LLC Texas Genco LP, LLC Energy Protection Insurance Company NRG Maintenance Services LLC Texas Genco Services, LP Everything Energy LLC NRG Mextrans Inc. US Retailers LLC Forward Home Security, LLC NRG Middletown Operations Inc. Vienna Operations Inc. GCP Funding Company, LLC NRG Montville Operations Inc. Vienna Power LLC Green Mountain Energy Company NRG North Central Operations Inc. WCP (Generation) Holdings LLC Gregory Partners, LLC NRG Norwalk Harbor Operations Inc. West Coast Power LLC Gregory Power Partners LLC NRG Operating Services, Inc. XOOM Alberta Holdings, LLC Huntley Power LLC NRG Oswego Harbor Power Operations Inc. XOOM British Columbia Holdings, LLC Independence Energy Alliance LLC NRG Portable Power LLC XOOM Energy California, LLC Independence Energy Group LLC NRG Power Marketing LLC XOOM Energy Connecticut, LLC Independence Energy Natural Gas LLC NRG Reliability Solutions LLC XOOM Energy Delaware, LLC Indian River Operations Inc. NRG Renter's Protection LLC XOOM Energy Georgia, LLC Indian River Power LLC NRG Retail LLC XOOM Energy Global Holdings, LLC Meriden Gas Turbines LLC NRG Retail Northeast LLC XOOM Energy Illinois LLC Middletown Power LLC NRG Rockford Acquisition LLC XOOM Energy Indiana, LLC Montville Power LLC NRG Saguaro Operations Inc. XOOM Energy Kentucky, LLC NEO Corporation NRG Security LLC XOOM Energy Maine, LLC New Genco GP, LLC NRG Services Corporation XOOM Energy Maryland, LLC Norwalk Power LLC NRG SimplySmart Solutions LLC XOOM Energy Massachusetts, LLC NRG Advisory Services LLC NRG South Central Operations Inc. XOOM Energy Michigan, LLC NRG Affiliate Services Inc. NRG South Texas LP XOOM Energy New Hampshire, LLC NRG Arthur Kill Operations Inc. NRG Texas Gregory LLC XOOM Energy New Jersey, LLC NRG Astoria Gas Turbine Operations Inc. NRG Texas Holding Inc. XOOM Energy New York, LLC NRG Business Services LLC NRG Texas LLC XOOM Energy Ohio, LLC NRG Cabrillo Power Operations Inc. NRG Texas Power LLC XOOM Energy Pennsylvania, LLC NRG California Peaker Operations LLC NRG Warranty Services LLC XOOM Energy Rhode Island, LLC NRG Cedar Bayou Development Company, LLC NRG West Coast LLC XOOM Energy Texas, LLC NRG Connected Home LLC NRG Western Affiliate Services Inc. XOOM Energy Virginia, LLC NRG Construction LLC Oswego Harbor Power LLC XOOM Energy Washington D.C., LLC NRG Curtailment Solutions, Inc. Reliant Energy Northeast LLC XOOM Energy, LLC NRG Development Company Inc. Reliant Energy Power Supply, LLC XOOM Ontario Holdings, LLC NRG Devon Operations Inc. Reliant Energy Retail Holdings, LLC XOOM Solar, LLC NRG Dispatch Services LLC NRG conducts much of its business through and derives much of its income from its subsidiaries. Therefore, the Company's ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and NRG's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to NRG. However, there may be restrictions for certain non-guarantor subsidiaries. The following condensed consolidating financial information presents the financial information of NRG Energy, Inc., the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 of Regulation S-X of the Securities Act. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities. In this presentation, NRG Energy, Inc. consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of NRG are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis. NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the three months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 2,055 $ 181 $ — $ 2 $ 2,238 Operating Costs and Expenses Cost of operations 1,271 154 7 2 1,434 Depreciation and amortization 80 20 10 — 110 Selling, general and administrative costs 137 7 64 — 208 Development costs — 1 1 — 2 Total operating costs and expenses 1,488 182 82 2 1,754 Operating Income/(Loss) 567 (1) (82) — 484 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 3 — 583 (586) — Equity in earnings of unconsolidated affiliates — 12 — — 12 Other income, net 7 5 2 — 14 Interest expense (4) (2) (90) — (96) Total other income/(expense) 6 15 495 (586) (70) Income from Continuing Operations Before Income Taxes 573 14 413 (586) 414 Income tax expense — 1 100 — 101 Net Income $ 573 $ 13 $ 313 $ (586) $ 313 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 3,833 $ 433 $ — $ (9) $ 4,257 Operating Costs and Expenses Cost of operations 2,561 356 (17) (9) 2,891 Depreciation and amortization 160 39 20 — 219 Selling, general and administrative costs 277 12 128 — 417 Reorganization costs — — 3 — 3 Development costs — 1 4 — 5 Total operating costs and expenses 2,998 408 138 (9) 3,535 Gain on sale of assets — 1 5 — 6 Operating Income/(Loss) 835 26 (133) — 728 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 6 — 845 (851) — Equity in earnings of unconsolidated affiliates — 1 — — 1 Impairment losses on investments — (18) — — (18) Other income, net 10 4 27 — 41 Loss on debt extinguishment, net — — (1) — (1) Interest expense (9) (3) (181) — (193) Total other income/(expense) 7 (16) 690 (851) (170) Income from Continuing Operations Before Income Taxes 842 10 557 (851) 558 Income tax expense — 1 123 — 124 Net Income $ 842 $ 9 $ 434 $ (851) $ 434 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) For the three months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 573 $ 13 $ 313 $ (586) $ 313 Other Comprehensive Income Foreign currency translation adjustments, net 12 13 13 (25) 13 Defined benefit plans, net 1 — — (1) — Other comprehensive income 13 13 13 (26) 13 Comprehensive Income $ 586 $ 26 $ 326 $ (612) $ 326 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 842 $ 9 $ 434 $ (851) $ 434 Other Comprehensive Loss Foreign currency translation adjustments, net (3) (2) (2) 5 (2) Defined benefit plans, net 3 — — (3) — Other comprehensive loss — (2) (2) 2 (2) Comprehensive Income $ 842 $ 7 $ 432 $ (849) $ 432 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ 20 $ 398 $ — $ 418 Funds deposited by counterparties 36 — — — 36 Restricted cash 7 — 1 — 8 Accounts receivable, net 987 111 1,267 (1,350) 1,015 Inventory 306 82 — — 388 Derivative instruments 789 22 — (20) 791 Cash collateral paid in support of energy risk management activities 133 3 — — 136 Prepayments and other current assets 247 10 27 — 284 Total current assets 2,505 248 1,693 (1,370) 3,076 Property, plant and equipment, net 1,336 1,046 151 — 2,533 Other Assets Investment in subsidiaries 170 — 4,525 (4,695) — Equity investments in affiliates — 372 — — 372 Operating lease right-of-use assets, net 73 244 112 — 429 Goodwill 400 179 — — 579 Intangible assets, net 695 38 — — 733 Nuclear decommissioning trust fund 794 — — — 794 Derivative instruments 439 9 — (9) 439 Deferred income taxes 435 (33) 2,768 — 3,170 Other non-current assets 150 27 35 — 212 Total other assets 3,156 836 7,440 (4,704) 6,728 Total Assets $ 6,997 $ 2,130 $ 9,284 $ (6,074) $ 12,337 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Current portion of long-term debt $ 3 $ 4 $ — $ — $ 7 Current portion of operating lease liabilities 19 31 19 — 69 Accounts payable 809 187 1,090 (1,350) 736 Derivative instruments 739 9 — (20) 728 Cash collateral received in support of energy risk management activities 36 — — — 36 Accrued expenses and other current liabilities 296 31 254 — 581 Total current liabilities 1,902 262 1,363 (1,370) 2,157 Other Liabilities Long-term debt 245 24 5,541 — 5,810 Non-current operating lease liabilities 58 290 110 — 458 Nuclear decommissioning reserve 307 — — — 307 Nuclear decommissioning trust liability 478 — — — 478 Derivative instruments 307 1 — (9) 299 Deferred income taxes — 17 — — 17 Other non-current liabilities 421 120 520 — 1,061 Total other liabilities 1,816 452 6,171 (9) 8,430 Total Liabilities 3,718 714 7,534 (1,379) 10,587 Stockholders’ Equity 3,279 1,416 1,750 (4,695) 1,750 Total Liabilities and Stockholders’ Equity $ 6,997 $ 2,130 $ 9,284 $ (6,074) $ 12,337 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Cash Flows from Operating Activities Net income $ 842 $ 9 $ 434 $ (851) $ 434 Adjustments to reconcile net income/(loss) to cash provided by operating activities: Distributions from and equity in earnings/(losses) of unconsolidated affiliates and consolidated subsidiaries (6) 7 (845) 851 7 Depreciation and amortization 160 39 20 — 219 Accretion of asset retirement obligations 10 8 — — 18 Provision for credit losses 47 1 — — 48 Amortization of nuclear fuel 25 — — — 25 Amortization of financing costs and debt discount/premiums — — 12 — 12 Loss on debt extinguishment, net — — 1 — 1 Amortization of emission allowances and energy credits 24 9 — — 33 Amortization of unearned equity compensation — — 12 — 12 Net gain on sale of assets and disposal of assets (9) (1) (5) — (15) Impairment losses — 18 — — 18 Changes in derivative instruments (144) 13 — — (131) Changes in deferred income taxes and liability for uncertain tax benefits 1,212 (154) (942) — 116 Changes in collateral deposits in support of energy risk management activities 53 5 — — 58 Changes in nuclear decommissioning trust liability 36 — — — 36 Changes in other working capital (124) (19) (56) — (199) Net Cash Provided/(Used) by Operating Activities 2,126 (65) (1,369) — 692 Cash Flows from Investing Activities Intercompany dividends — — 1,889 (1,889) — Payments for acquisitions of businesses (5) — — — (5) Capital expenditures (78) (20) (18) — (116) Net purchases of emission allowances (4) — — — (4) Investments in nuclear decommissioning trust fund securities (257) — — — (257) Proceeds from the sale of nuclear decommissioning trust fund securities 220 — — — 220 Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 10 — 5 — 15 Net contributions to investments in unconsolidated affiliates — 2 — — 2 Net Cash (Used)/Provided by Investing Activities (114) (18) 1,876 (1,889) (145) Cash Flows from Financing Activities Intercompany dividends and transfers (1,941) 86 (34) 1,889 — Payments of dividends to common stockholders — — (148) — (148) Payments for share repurchase activity — — (229) — (229) Purchase of and distributions to noncontrolling interests from subsidiaries — (2) — — (2) Proceeds from issuance of common stock — — 1 — 1 Proceeds from issuance of long-term debt — — 59 — 59 Payment of debt issuance costs — — (1) — (1) Repayments of long-term debt (60) (1) — — (61) Net repayment of Revolving Credit Facility — — (83) — (83) Other (5) — — — (5) Net Cash (Used)/Provided by Financing Activities (2,006) 83 (435) 1,889 (469) Effect of exchange rate changes on cash and cash equivalents — (1) — — (1) Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 6 (1) 72 — 77 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 37 21 327 — 385 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 43 $ 20 $ 399 $ — $ 462 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the three months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 2,140 $ 332 $ — $ (7) $ 2,465 Operating Costs and Expenses Cost of operations 1,590 252 10 (7) 1,845 Depreciation and amortization 51 26 8 — 85 Impairment losses 1 — — — 1 Selling, general and administrative costs 112 12 87 — 211 Reorganization costs — — 2 — 2 Development costs — 1 1 — 2 Total operating costs and expenses 1,754 291 108 (7) 2,146 Gain on sale of assets — 1 — — 1 Operating Income/(Loss) 386 42 (108) — 320 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 2 — 430 (432) — Other income, net 4 8 8 — 20 Loss on debt extinguishment, net — — (47) — (47) Interest expense (3) (5) (97) — (105) Total other income/(expense) 3 3 294 (432) (132) Income from Continuing Operations Before Income Taxes 389 45 186 (432) 188 Income tax expense/(benefit) — 1 (2) — (1) Income from Continuing Operations 389 44 188 (432) 189 Income from discontinued operations, net of income tax — — 13 — 13 Net Income 389 44 201 (432) 202 Less: Net income attributable to noncontrolling interest and redeemable noncontrolling interest — 1 — — 1 Net Income Attributable to NRG Energy, Inc. $ 389 $ 43 $ 201 $ (432) $ 201 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 3,909 $ 727 $ — $ (6) $ 4,630 Operating Costs and Expenses Cost of operations 2,948 535 19 (6) 3,496 Depreciation and amortization 105 49 16 — 170 Impairment losses 1 — — — 1 Selling, general and administrative costs 234 28 143 — 405 Reorganization costs — — 15 — 15 Development costs — 1 3 — 4 Total operating costs and expenses 3,288 613 196 (6) 4,091 Gain on sale of assets 1 1 — — 2 Operating Income/(Loss) 622 115 (196) — 541 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 12 — 729 (741) — Equity in losses of unconsolidated affiliates — (21) — — (21) Other income, net 8 9 15 — 32 Loss on debt extinguishment, net — — (47) — (47) Interest expense (7) (9) (203) — (219) Total other income/(expense) 13 (21) 494 (741) (255) Income from Continuing Operations Before Income Taxes 635 94 298 (741) 286 Income tax expense — 1 2 — 3 Income from Continuing Operations 635 93 296 (741) 283 Income from discontinued operations, net of income tax 9 5 387 — 401 Net Income 644 98 683 (741) 684 Less: Net income attributable to noncontrolling interest and redeemable noncontrolling interest — 1 — — 1 Net Income Attributable to NRG Energy, Inc. $ 644 $ 97 $ 683 $ (741) $ 683 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the three months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 389 $ 44 $ 201 $ (432) $ 202 Other Comprehensive Loss Foreign currency translation adjustments, net (1) (1) (1) 2 (1) Available-for-sale securities, net — — 1 — 1 Defined benefit plans, net — — (3) — (3) Other comprehensive loss (1) (1) (3) 2 (3) Comprehensive Income 388 43 198 (430) 199 Less: Comprehensive income attributable to redeemable noncontrolling interest — 1 — — 1 Comprehensive Income Attributable to NRG Energy, Inc. $ 388 $ 42 $ 198 $ (430) $ 198 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 644 $ 98 $ 683 $ (741) $ 684 Other Comprehensive Loss Available-for-sale securities, net — — 1 — 1 Defined benefit plans, net — — (6) — (6) Other comprehensive loss — — (5) — (5) Comprehensive Income 644 98 678 (741) 679 Less: Comprehensive income attributable to redeemable noncontrolling interest — 1 — — 1 Comprehensive Income Attributable to NRG Energy, Inc. $ 644 $ 97 $ 678 $ (741) $ 678 (a) All significant intercompany transactions have been eliminated in consolidation CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2019 (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ 20 $ 325 $ — $ 345 Funds deposited by counterparties 32 — — — 32 Restricted cash 5 1 2 — 8 Accounts receivable, net 1,293 239 233 (740) 1,025 Inventory 272 111 — — 383 Derivative instruments 856 45 — (41) 860 Cash collateral paid in support of energy risk management activities 182 8 — — 190 Prepayments and other current assets 170 8 67 — 245 Total current assets 2,810 432 627 (781) 3,088 Property, plant and equipment, net 1,483 952 158 — 2,593 Other Assets Investment in subsidiaries 710 — 4,785 (5,495) — Equity investments in affiliates — 388 — — 388 Operating lease right-of-use assets, net 81 261 122 — 464 Goodwill 359 220 — — 579 Intangible assets, net 375 414 — — 789 Nuclear decommissioning trust fund 794 — — — 794 Derivative instruments 308 15 — (13) 310 Deferred income taxes 421 (19) 2,884 — 3,286 Other non-current assets 145 30 65 — 240 Total other assets 3,193 1,309 7,856 (5,508) 6,850 Total Assets $ 7,486 $ 2,693 $ 8,641 $ (6,289) $ 12,531 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Current portion of long-term debt $ — $ 5 $ 83 $ — $ 88 Current portion of operating lease liabilities 20 32 21 — 73 Accounts payable 918 141 403 (740) 722 Derivative instruments 797 25 — (41) 781 Cash collateral received in support of energy risk management activities 32 — — — 32 Accrued expenses and other current liabilities 280 44 339 — 663 Total current liabilities 2,047 247 846 (781) 2,359 Other Liabilities Long-term debt 302 28 5,473 — 5,803 Non-current operating lease liabilities 64 301 118 — 483 Nuclear decommissioning reserve 298 — — — 298 Nuclear decommissioning trust liability 487 — — — 487 Derivative instruments 334 1 — (13) 322 Deferred income taxes — 17 — — 17 Other non-current liabilities 399 153 532 — 1,084 Total other liabilities 1,884 500 6,123 (13) 8,494 Total Liabilities 3,931 747 6,969 (794) 10,853 Redeemable noncontrolling interest in subsidiaries — 20 — — 20 Stockholders’ Equity 3,555 1,926 1,672 (5,495) 1,658 Total Liabilities and Stockholders’ Equity $ 7,486 $ 2,693 $ 8,641 $ (6,289) $ 12,531 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Cash Flows from Operating Activities Net income $ 644 $ 98 $ 683 $ (741) $ 684 Income from discontinued operations 9 5 387 — 401 Income from continuing operations 635 93 296 (741) 283 Adjustments to reconcile net income to cash provided by operating activities: Distributions from and equity in earnings/(losses) of unconsolidated affiliates and consolidated subsidiaries (12) 22 (729) 741 22 Depreciation and amortization 104 50 16 — 170 Accretion of asset retirement obligations 11 3 — — 14 Provision for credit losses 42 4 6 — 52 Amortization of nuclear fuel 27 — — — 27 Amortization of financing costs and debt discount/premiums — — 13 — 13 Loss on debt extinguishment, net — — 47 — 47 Amortization of emission allowances and energy credits 13 1 — — 14 Amortization of unearned equity compensation — — 10 — 10 Net loss on sale of assets and disposal of assets (3) 1 3 — 1 Impairment losses 1 — — — 1 Changes in derivative instruments (28) (32) 38 — (22) Changes in deferred income taxes and liability for uncertain tax benefits — (3) (2) — (5) Changes in collateral deposits in support of energy risk management activities 128 (3) — — 125 Changes in nuclear decommissioning trust liability 17 — — — 17 Changes in other working capital (343) (64) 55 — (352) Cash provided/(used) by continuing operations 592 72 (247) — 417 Cash provided/(used) by discontinued operations 17 (9) — — 8 Net Cash Provided/(Used) by Operating Activities 609 63 (247) — 425 Cash Flows from Investing Activities Intercompany dividends — — 2,209 (2,209) — Payments for acquisitions of businesses (21) — — — (21) Capital expenditures (77) (15) (15) — (107) Net purchases of emission allowances (1) — — — (1) Investments in nuclear decommissioning trust fund securities (209) — — — (209) Proceeds from the sale of nuclear decommissioning trust fund securities 191 — — — 191 Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 1 400 888 — 1,289 Net distributions from investments in unconsolidated affiliates — 7 — — 7 Contributions to discontinued operations — (44) — — (44) Cash (used)/provided by continuing operations (116) 348 3,082 (2,209) 1,105 Cash used by discontinued operations — (2) — — (2) Net Cash (Used)/Provided by Investing Activities (116) 346 3,082 (2,209) 1,103 Cash Flows from Financing Activities Intercompany dividends and transfers (532) (375) (1,302) 2,209 — Payment of dividends to common stockholders — — (16) — (16) Payments for share repurchase activity — — (1,075) — (1,075) Payments for debt extinguishment — — (24) — (24) Net distributions to noncontrolling interests from subsidiaries — (1) — — (1) Proceeds from issuance of common stock — — 2 — 2 Proceeds from issuance of long-term debt — — 1,833 — 1,833 Payment of debt issuance costs — — (33) — (33) Payments for long-term debt — (53) (2,432) — (2,485) Cash used by continuing operations (532) (429) (3,047) 2,209 (1,799) Cash provided by discontinued operations — 43 — — 43 Net Cash Used by Financing Activities (532) (386) (3,047) 2,209 (1,756) Change in cash from discontinued operations 17 32 — — 49 Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (56) (9) (212) — (277) Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 95 38 480 — 613 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 39 $ 29 $ 268 $ — $ 336 (a) All significant intercompany transactions have been eliminated in consolidation

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Segment Reporting	Segments As part of perfecting the integrated model, in which the majority of the Company’s generation serves its retail customers, the Company began managing its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus in 2020. As a result, the Company changed its business segments from Retail and Generation to Texas, East and West/Other beginning in the first quarter of 2020. The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources. The Company's businesses are segregated as follows: • Texas, which includes all activity related to customer, plant and market operations in Texas; • East, which includes the remaining activity related to customer operations and all activity related to plant and market operations in the East; • West/Other, which includes the following assets and activities: (i) all activity related to plant and market operations in the West, (ii) activity related to the Cottonwood power plant that was sold to Cleco on February 4, 2019 and is being leased back until 2025, (iii) the remaining renewables activity, including the Company’s equity method investments in Ivanpah Master Holdings, LLC and Agua Caliente, the remaining Home Solar assets and the NFL stadium solar generating assets, and (iv) activity related to the Company’s equity method investment for the Gladstone power plant in Australia; and • Corporate activities. All affected disclosures have been recast to reflect these changes for all periods presented. For further discussion of segment reporting, refer to Note 13, Segment Reporting . As part of perfecting the integrated model, in which the majority of the Company’s generation serves its retail customers, the Company began managing its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus in 2020. As a result, the Company changed its business segments from Retail and Generation to Texas, East and West/Other beginning in the first quarter of 2020, as further described in Note 1, Nature of Business . The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources The financial information for the three and six months ended June 30, 2019 was recast to reflect the current segment structure. In February 2019, as described in Note 4, Acquisitions, Discontinued Operations and Dispositions , the Company completed the sales of the South Central Portfolio and Carlsbad. The financial information for the three and six months ended June 30, 2019 presented below reflects the presentation of these entities as discontinued operations within the corporate segment.
Use of Estimates	Use of EstimatesThe preparation of financial statements in conformity with GAAP 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.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified for comparative purposes.
Credit Losses	Credit Losses On January 1, 2020, the Company adopted ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , or ASU No. 2016-13, using the modified retrospective approach. Following the adoption of the new standard, the Company’s process of estimating expected credit losses remains materially consistent with its historical practice. Information prior to January 1, 2020, which was previously referred to as the allowance and provision for bad debt, has not been restated and continues to be reported under the accounting standards in effect for that period. Retail trade receivables are reported on the balance sheet net of the allowance for credit losses. The Company accrues an allowance for current expected credit losses based on (i) estimates of uncollectible revenues by analyzing accounts receivable aging and current and reasonable forecasts of expected economic factors including, but not limited to, unemployment rates and weather-related events, (ii) historical collections and delinquencies, and (iii) counterparty credit ratings for commercial and industrial customers.
Restricted Cash	Funds deposited by counterparties consist of cash held by the Company as a result of collateral posting obligations from its counterparties. Some amounts are segregated into separate accounts that are not contractually restricted but, based on the Company's intention, are not available for the payment of general corporate obligations. Depending on market fluctuations and the settlement of the underlying contracts, the Company will refund this collateral to the hedge counterparties pursuant to the terms and conditions of the underlying trades. Since collateral requirements fluctuate daily and the Company cannot predict if any collateral will be held for more than twelve months, the funds deposited by counterparties are classified as a current asset on the Company's balance sheet, with an offsetting liability for this cash collateral received within current liabilities. Restricted cash consists primarily of funds held within the Company's projects that are restricted for specific uses.
Recent Accounting Developments	Recent Accounting Developments - Guidance Adopted in 2020 ASU 2018-17 — In October 2018, the FASB issued ASU No. 2018-17, Consolidations (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities , or ASU No. 2018-17, in response to stakeholders’ observations that Topic 810, Consolidations , could be improved thereby improving general purpose financial reporting. Specifically, ASU No. 2018-17 requires application of the variable interest entity (VIE) guidance to private companies under common control and consideration of indirect interest held through related parties under common control for determining whether fees paid to decision makers and service providers are variable interests. The amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. All entities are required to apply the amendments retrospectively. The adoption did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2018-15 — In August 2018, the FASB issued ASU No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in Cloud Computing Arrangement That Is a Service Contract , or ASU No. 2018-15. The amendments in ASU No. 2018-15 align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal-use software (and hosting arrangement that include an internal-use software license). The amendment also requires the customer to amortize the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The Company adopted the amendments effective January 1, 2020 using the prospective approach. The adoption did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2018-13 — In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirement for Fair value Measurement) , or ASU No. 2018-13. The amendments in ASU No. 2018-13 eliminate such disclosures as the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and add new disclosure requirements for Level 3 measurements. ASU No. 2018-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Certain disclosures in ASU No. 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. The Company adopted the amendments effective January 1, 2020. As the amendments contemplates changes in disclosures only, it did not have an impact on the Company's results of operations, cash flows, or statement of financial position. ASU 2016-13 — In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Statements, or ASU No. 2016-13, which was further amended through various updates issued by the FASB thereafter. The guidance in ASU No. 2016-13 provides a new model for recognizing credit losses on financial assets carried at amortized cost using an estimate of expected credit losses, instead of the "incurred loss" methodology previously required for recognizing credit losses that delayed recognition until it was probable that a loss was incurred. The estimate of expected credit losses is to be based on consideration of past events, current conditions and reasonable and supportable forecasts of future conditions. The Company adopted the standard and its subsequent corresponding updates effective January 1, 2020 using the modified retrospective approach. Results for the reporting periods after January 1, 2020 are presented under Topic 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company's adoption of Topic 326 did not have a material impact on the Company's results of operations, cash flows, or statement of financial position. Recent Accounting Developments - Guidance Not Yet Adopted ASU 2019-12 — In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,
Nuclear Decommissioning	NRG's Nuclear Decommissioning Trust Fund assets, which are for the decommissioning of its 44% interest in STP, are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Other Balance Sheet Information	The following table presents the accumulated depreciation included in property, plant and equipment, net and accumulated amortization included in intangible assets, net: (In millions) June 30, 2020 December 31, 2019 Property, plant and equipment accumulated depreciation $ 1,868 $ 1,752 Intangible assets accumulated amortization 1,279 1,262
Activity in Allowance for Credit Losses	The following table represents the activity in the allowance for credit losses for the three and six months ended June 30, 2020: (In millions) Three months ended June 30, 2020 Six months ended June 30, 2020 Beginning balance $ 39 $ 43 Provision for credit losses 24 48 Write-offs (20) (52) Recoveries collected 4 8 Ending balance $ 47 $ 47
Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties	The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: (In millions) June 30, 2020 December 31, 2019 Cash and cash equivalents $ 418 $ 345 Funds deposited by counterparties 36 32 Restricted cash 8 8 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 462 $ 385

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue from Contracts with Customer	Disaggregated Revenues The following tables represent the Company’s disaggregation of revenue from contracts with customers for the three and six months ended June 30, 2020 and 2019: Three months ended June 30, 2020 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 1,273 $ 291 $ — $ — $ 1,564 Business Solutions 248 20 — — 268 Total retail revenue 1,521 311 — — 1,832 Energy revenue (a) 5 19 60 (1) 83 Capacity revenue (a) — 179 16 — 195 Mark-to-market for economic hedging activities (b) — 40 1 2 43 Other revenue (a) 52 17 17 (1) 85 Total operating revenue 1,578 566 94 — 2,238 Less: Lease revenue — 1 4 — 5 Less: Realized and unrealized ASC 815 revenue 7 85 16 1 109 Total revenue from contracts with customers $ 1,571 $ 480 $ 74 $ (1) $ 2,124 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ — $ 2 $ 10 $ (1) $ 11 Capacity revenue — 41 — — 41 Other revenue 7 2 5 — 14 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended June 30, 2019 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 1,161 $ 235 $ — $ (1) $ 1,395 Business Solutions 272 18 — — 290 Total retail revenue 1,433 253 — (1) 1,685 Energy revenue (a) 136 48 52 — 236 Capacity revenue (a) — 195 6 — 201 Mark-to-market for economic hedging activities (b) 210 16 16 (1) 241 Other revenue (a) 58 12 32 — 102 Total operating revenue 1,837 524 106 (2) 2,465 Less: Lease revenue — 1 4 — 5 Less: Realized and unrealized ASC 815 revenue 579 64 34 — 677 Total revenue from contracts with customers $ 1,258 $ 459 $ 68 $ (2) $ 1,783 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ 355 $ 20 $ 5 $ — $ 380 Capacity revenue — 29 — 1 30 Other revenue 14 (1) 13 — 26 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2020 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 2,305 $ 638 $ — $ (1) $ 2,942 Business Solutions 508 43 — — 551 Total retail revenue 2,813 681 — (1) 3,493 Energy revenue (a) 10 64 135 (2) 207 Capacity revenue (a) — 313 31 — 344 Mark-to-market for economic hedging activities (b) — 20 16 3 39 Other revenue (a) 113 27 37 (3) 174 Total operating revenue 2,936 1,105 219 (3) 4,257 Less: Lease revenue — 1 9 — 10 Less: Realized and unrealized ASC 815 revenue 14 124 60 — 198 Total revenue from contracts with customers $ 2,922 $ 980 $ 150 $ (3) $ 4,049 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ — $ 37 $ 29 $ (2) $ 64 Capacity revenue — 65 — — 65 Other revenue 14 2 15 (1) 30 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2019 (In millions) Texas East West/Other Corporate/Eliminations Total Retail revenue: Mass Market $ 2,156 $ 555 $ — $ (3) $ 2,708 Business Solutions 530 36 — — 566 Total retail revenue 2,686 591 — (3) 3,274 Energy revenue (a) 241 174 110 1 526 Capacity revenue (a) — 339 18 — 357 Mark-to-market for economic hedging activities (b) 241 1 20 (1) 261 Other revenue (a) 135 28 51 (2) 212 Total operating revenue 3,303 1,133 199 (5) 4,630 Less: Lease revenue — 1 9 — 10 Less: Realized and unrealized ASC 815 revenue 894 118 46 — 1,058 Total revenue from contracts with customers $ 2,409 $ 1,014 $ 144 $ (5) $ 3,562 (a) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above: (In millions) Texas East West/Other Corporate/Eliminations Total Energy revenue $ 626 $ 67 $ 7 $ — $ 700 Capacity revenue — 47 — 1 48 Other revenue 27 3 19 — 49 (b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
Contract Asset and Liabilities	The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of June 30, 2020 and December 31, 2019: (In millions) June 30, 2020 December 31, 2019 Deferred customer acquisition costs $ 133 $ 133 Accounts receivable, net - Contracts with customers 981 1,002 Accounts receivable, net - Derivative instruments 30 18 Accounts receivable, net - Affiliate 4 5 Total accounts receivable, net $ 1,015 $ 1,025 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 328 $ 402 Deferred revenues (a) 84 82 (a) Deferred revenues from contracts with customers for the three months ended June 30, 2020 and the year ended December 31, 2019 were approximately $33 million and $24 million, respectively

Acquisitions, Discontinued Op_2

Acquisitions, Discontinued Operations and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Schedule of Purchase Price Allocation	The purchase price was allocated as follows: (In millions) Account receivable $ 98 Accounts payable (73) Other net current and non-current working capital 5 Marketing partnership 154 Customer relationships 85 Trade name 28 Other intangible assets 26 Goodwill (a) 6 Stream Purchase Price $ 329 (a) Goodwill arising from the acquisition is attributed to the value of the platform acquired and the synergies expected from combining the operations of Stream Energy with NRG's existing businesses. Goodwill of $5 million and $1 million was assigned to the Texas and East segments, respectively, and is not deductible for tax purposes
Summary of Results of Discontinued Operations	Summarized results of the South Central Portfolio discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Operating revenues $ — $ 31 Operating costs and expenses — (23) Gain from operations of discontinued components — 8 Gain on disposal of discontinued operations, net of tax 1 28 Gain from discontinued operations, including disposal, net of tax $ 1 $ 36 Summarized results of Carlsbad discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Operating revenues $ — $ 19 Operating costs and expenses — (9) Other expenses — (5) Gain from discontinued operations, net of tax — 5 (Loss)/gain on disposal of discontinued operations, net of tax (17) 331 Other Commitments, Indemnification and Fees 27 27 Gain on disposal of discontinued operations, net of tax 10 358 Gain from discontinued operations, including disposal, net of tax $ 10 $ 363 Summarized results of GenOn discontinued operations were as follows: Three months ended Six months ended (In millions) June 30, 2019 June 30, 2019 Gain from discontinued operations, net of tax $ 2 $ 2

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value	The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows: June 30, 2020 December 31, 2019 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Notes receivable $ 10 $ 7 $ 11 $ 8 Liabilities: Long-term debt, including current portion (a) 5,878 6,208 5,956 6,504 (a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt in the Company's consolidated balance sheets
Fair value hierarchy for long-term debt	The following table presents the level within the fair value hierarchy for long-term debt, including current portion, as of June 30, 2020 and December 31, 2019: June 30, 2020 December 31, 2019 (In millions) Level 2 Level 3 Level 2 Level 3 Long-term debt, including current portion $ 6,176 $ 32 $ 6,388 $ 116
Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis	The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: June 30, 2020 (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 13 $ — $ 13 $ — Nuclear trust fund investments: Cash and cash equivalents 26 26 — — U.S. government and federal agency obligations 48 47 1 — Federal agency mortgage-backed securities 87 — 87 — Commercial mortgage-backed securities 38 — 38 — Corporate debt securities 148 — 148 — Equity securities 371 371 — — Foreign government fixed income securities 7 — 7 — Other trust fund investments: U.S. government and federal agency obligations 1 1 — — Derivative assets: Commodity contracts 1,230 87 677 466 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 69 Equity securities 7 Total assets $ 2,045 $ 532 $ 971 $ 466 Derivative liabilities: Commodity contracts $ 1,027 $ 151 $ 562 $ 314 Total liabilities $ 1,027 $ 151 $ 562 $ 314 December 31, 2019 (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 20 $ — $ 20 $ — Nuclear trust fund investments: Cash and cash equivalents 17 17 — — U.S. government and federal agency obligations 68 68 — — Federal agency mortgage-backed securities 100 — 100 — Commercial mortgage-backed securities 29 — 29 — Corporate debt securities 109 — 109 — Equity securities 388 388 — — Foreign government fixed income securities 5 — 5 — Other trust fund investments: U.S. government and federal agency obligations 1 1 — — Derivative assets: Commodity contracts 1,170 84 893 193 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 78 Equity securities 8 Total assets $ 1,993 $ 558 $ 1,156 $ 193 Derivative liabilities: Commodity contracts $ 1,103 $ 143 $ 805 $ 155 Total liabilities $ 1,103 $ 143 $ 805 $ 155
Reconciliation of beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements at least annually using significant unobservable inputs	The following tables reconcile, for the three and six months ended June 30, 2020 and 2019, the beginning and ending balances for financial instruments that are recognized at fair value in the condensed consolidated financial statements, using significant unobservable inputs: Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Three months ended Six months ended (In millions) Derivatives (a) Derivatives (a) Beginning balance $ 73 $ 38 Total gains realized/unrealized— included in earnings 52 74 Purchases 8 16 Transfers into Level 3 (b) 25 33 Transfers out of Level 3 (b) (6) (9) Ending balance $ 152 $ 152 Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end $ 36 $ 27 (a) Consists of derivative assets and liabilities, net (b) Transfers into/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2 Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Three months ended June 30, 2019 Six months ended June 30, 2019 (In millions) Debt Securities Derivatives (a) Total Debt Securities Derivatives (a) Total Beginning balance $ 18 $ (2) $ 16 19 $ 20 $ 39 Contracts added from acquisitions — (1) (1) — (1) (1) Total gains/(losses) realized/unrealized— included in earnings 1 (17) (16) 1 (27) (26) Cash received — — — (1) — (1) Purchases — (10) (10) — (12) (12) Transfers into Level 3 (b) — 113 113 — 130 130 Transfers out of Level 3 (b) — 14 14 — (13) (13) Ending balance 19 97 116 19 97 116 Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 1 (19) (18) 1 (31) (30) (a) Consists of derivative assets and liabilities, net (b) Transfers into/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2
Significant unobservable inputs used developing fair values, Quantitative Information	The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of June 30, 2020 and December 31, 2019: June 30, 2020 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Power Contracts $ 431 $ 306 Discounted Cash Flow Forward Market Price (per MWh) $ 4 $ 181 $ 26 FTRs 35 8 Discounted Cash Flow Auction Prices (per MWh) (55) 48 0 $ 466 $ 314 December 31, 2019 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Power Contracts $ 151 $ 139 Discounted Cash Flow Forward Market Price (per MWh) $ 8 $ 218 $ 24 FTRs 42 16 Discounted Cash Flow Auction Prices (per MWh) (105) 213 0 $ 193 $ 155
Fair value inputs, sensitivity analysis	The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of June 30, 2020 and December 31, 2019: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Power Sell Increase/(Decrease) Lower/(Higher) FTR Prices Buy Increase/(Decrease) Higher/(Lower) FTR Prices Sell Increase/(Decrease) Lower/(Higher)
Net counterparty credit exposure by industry sector and by counterparty credit quality	The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables. Net Exposure (a)(b) Category by Industry Sector (% of Total) Utilities, energy merchants, marketers and other 77 % Financial institutions 23 Total as of June 30, 2020 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 59 % Non-investment grade/non-rated 41 Total as of June 30, 2020 100 % (a) Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices (b) The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long-term contracts

Nuclear Decommissioning Trust_2

Nuclear Decommissioning Trust Fund (Tables)	6 Months Ended
	Jun. 30, 2020
Regulated Operations [Abstract]
Summary of aggregate fair values and unrealized gains and losses for the securities held in the trust fund	The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds, as well as information about the contractual maturities of those securities. As of June 30, 2020 As of December 31, 2019 (In millions, except maturities) Fair Value Unrealized Gains Unrealized Losses Weighted-average Maturities (In years) Fair Value Unrealized Gains Unrealized Losses Weighted-average Maturities (In years) Cash and cash equivalents $ 26 $ — $ — — $ 17 $ — $ — — U.S. government and federal agency obligations 48 8 — 13 68 4 — 11 Federal agency mortgage-backed securities 87 4 — 24 100 3 — 24 Commercial mortgage-backed securities 38 2 — 27 29 1 1 24 Corporate debt securities 148 12 1 12 109 6 — 11 Equity securities 440 298 — — 466 324 — — Foreign government fixed income securities 7 1 — 10 5 — — 10 Total $ 794 $ 325 $ 1 $ 794 $ 338 $ 1
Summary of proceeds from sales of available-for-sale securities and the related realized gains and losses	The following table summarizes proceeds from sales of available-for-sale securities held in the trust funds and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method. Six months ended June 30, (In millions) 2020 2019 Realized gains $ 7 $ 5 Realized losses (9) (5) Proceeds from sale of securities 220 191

Accounting for Derivative Ins_2

Accounting for Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity	The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception, as of June 30, 2020 and December 31, 2019. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date. Total Volume (In millions) Category Units June 30, 2020 December 31, 2019 Emissions Short Ton 1 3 Renewable Energy Certificates Certificates 1 1 Coal Short Ton 5 10 Natural Gas MMBtu (237) (181) Power MWh 56 38 Capacity MW/Day (1) (1)
Fair value within the derivative instrument valuation on the balance sheets	The following table summarizes the fair value within the derivative instrument valuation on the balance sheets: Fair Value Derivative Assets Derivative Liabilities (In millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Commodity contracts current $ 791 $ 860 $ 728 $ 781 Commodity contracts long-term 439 310 299 322 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 1,230 $ 1,170 $ 1,027 $ 1,103
Offsetting of derivatives by counterparty assets	The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid: Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of June 30, 2020 Commodity contracts: Derivative assets $ 1,230 $ (921) $ (22) $ 287 Derivative liabilities (1,027) 921 38 (68) Total commodity contracts $ 203 $ — $ 16 $ 219 Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of December 31, 2019 Commodity contracts: Derivative assets $ 1,170 $ (909) $ (7) $ 254 Derivative liabilities (1,103) 909 73 (121) Total commodity contracts $ 67 $ — $ 66 $ 133
Offsetting of derivatives by counterparty, liabilities	The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid: Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of June 30, 2020 Commodity contracts: Derivative assets $ 1,230 $ (921) $ (22) $ 287 Derivative liabilities (1,027) 921 38 (68) Total commodity contracts $ 203 $ — $ 16 $ 219 Gross Amounts Not Offset in the Statement of Financial Position (In millions) Gross Amounts of Recognized Assets / Liabilities Derivative Instruments Cash Collateral (Held) / Posted Net Amount As of December 31, 2019 Commodity contracts: Derivative assets $ 1,170 $ (909) $ (7) $ 254 Derivative liabilities (1,103) 909 73 (121) Total commodity contracts $ 67 $ — $ 66 $ 133
Pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations	The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges or fair value hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense. (In millions) Three months ended June 30, Six months ended June 30, Unrealized mark-to-market results 2020 2019 2020 2019 Reversal of previously recognized unrealized losses on settled positions related to economic hedges $ 30 $ 11 $ 39 $ 30 Reversal of acquired loss/(gain) positions related to economic hedges 3 1 4 (1) Net unrealized gains on open positions related to economic hedges 54 9 88 12 Total unrealized mark-to-market gains for economic hedging activities 87 21 131 41 Reversal of previously recognized unrealized (gains) on settled positions related to trading activity (5) (1) (7) (7) Net unrealized gains on open positions related to trading activity 4 13 17 26 Total unrealized mark-to-market (losses)/gains for trading activity (1) 12 10 19 Total unrealized gains $ 86 $ 33 $ 141 $ 60 Three months ended June 30, Six months ended June 30, (In millions) 2020 2019 2020 2019 Unrealized gains included in operating revenues $ 42 $ 253 $ 49 $ 280 Unrealized gains/(losses) included in cost of operations 44 (220) 92 (220) Total impact to statement of operations — energy commodities $ 86 $ 33 $ 141 $ 60 Total impact to statement of operations — interest rate contracts $ — $ (29) $ — $ (38)

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-term debt	Long-term debt consisted of the following: (In millions, except rates) June 30, 2020 December 31, 2019 Interest rate % Recourse debt: Senior Notes, due 2026 $ 1,000 $ 1,000 7.250 Senior Notes, due 2027 1,230 1,230 6.625 Senior Notes, due 2028 821 821 5.750 Senior Notes, due 2029 733 733 5.250 Convertible Senior Notes, due 2048 (a) 575 575 2.750 Senior Secured First Lien Notes, due 2024 600 600 3.750 Senior Secured First Lien Notes, due 2029 500 500 4.450 Revolving Credit Facility (b) — 83 L+ 1.750 Tax-exempt bonds 466 466 1.30 - 6.00 Subtotal recourse debt 5,925 6,008 Non-recourse debt: Other 32 34 various Subtotal all non-recourse debt 32 34 Subtotal long-term debt (including current maturities) 5,957 6,042 Less current maturities (7) (88) Less debt issuance costs (61) (65) Discounts (79) (86) Total long-term debt $ 5,810 $ 5,803 (a) As of July 31, 2020, the Convertible Notes were convertible at a price of $46.65, which is equivalent to a conversion rate of approximately 21.44 shares of common stock per $1,000 principal amount. (b) As of December 31, 2019, the Company had drawn under its Revolving Credit Facility at 1-week LIBOR + 1.750

Investments Accounted for Usi_2

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Tables)	6 Months Ended
	Jun. 30, 2020
Variable Interest Entities Disclosure [Abstract]
Financial Information for Consolidated VIEs	The summarized financial information for the Company's consolidated VIEs consisted of the following: (In millions) June 30, 2020 December 31, 2019 Current assets $ 1 $ 3 Net property, plant and equipment — 71 Other long-term assets 25 27 Total assets 26 101 Current liabilities 4 4 Long-term debt 24 24 Other long-term liabilities 4 8 Total liabilities 32 36 Redeemable noncontrolling interest — 20 Net assets less noncontrolling interest $ (6) $ 45

Changes in Capital Structure (T

Changes in Capital Structure (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Changes in NRG's common shares issued and outstanding	As of June 30, 2020 and December 31, 2019, the Company had 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's common stock issued and outstanding: Issued Treasury Outstanding Balance as of December 31, 2019 421,890,790 (172,894,601) 248,996,189 Shares issued under LTIPs 1,140,987 — 1,140,987 Shares issued under ESPP — 63,455 63,455 Shares repurchased — (6,062,783) (6,062,783) Balance as of June 30, 2020 423,031,777 (178,893,929) 244,137,848
Shares Repurchased	The following repurchases have been made during the six months ended June 30, 2020: Total number of shares purchased Average price paid per share Amounts paid for shares purchased (in millions) 2020 repurchases: Repurchases 6,062,783 $ 197 Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances (a) 710,474 27 Total Share Repurchases during the six months ended June 30, 2020 6,773,257 $33.05 $ 224 (a) NRG elected to pay cash for tax withholding on equity awards instead of issuing actual shares to management. The average price per equivalent shares withheld was $38.24

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of NRG's basic and diluted earnings per share	The reconciliation of NRG's basic and diluted income per share is shown in the following table: Three months ended June 30, Six months ended June 30, (In millions, except per share data) 2020 2019 2020 2019 Basic income per share: Net income available to common shareholders $ 313 $ 201 $ 434 $ 683 Weighted average number of common shares outstanding - basic 245 265 246 272 Income per weighted average common share — basic $ 1.28 $ 0.76 $ 1.76 $ 2.51 Diluted income per share: Net income available to common shareholders $ 313 $ 201 $ 434 $ 683 Weighted average number of common shares outstanding - basic 245 265 246 272 Incremental shares attributable to the issuance of equity compensation (treasury stock method) 1 2 1 2 Weighted average number of common shares outstanding - dilutive 246 267 247 274 Income per weighted average common share — diluted $ 1.27 $ 0.75 $ 1.76 $ 2.49

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment	Three months ended June 30, 2020 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 1,578 $ 566 $ 94 $ — $ — $ 2,238 Depreciation and amortization 59 33 8 10 — 110 Equity in (losses)/earnings of unconsolidated affiliates (3) — 15 — — 12 Income/(loss) from continuing operations before income taxes 350 146 26 (109) 1 414 Income/(loss) from continuing operations 350 146 25 (209) 1 313 Net income/(loss) attributable to NRG Energy, Inc $ 350 $ 146 $ 25 $ (209) $ 1 $ 313 Three months ended June 30, 2019 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 1,837 $ 524 $ 106 $ 1 $ (3) $ 2,465 Depreciation and amortization 40 30 7 8 — 85 Impairment losses 1 — — — — 1 Reorganization costs 3 — — (1) — 2 Gain on sale of assets — — — 1 — 1 Equity in (losses)/earnings of unconsolidated affiliates (3) — 3 — — — Loss on debt extinguishment, net — — — (47) — (47) Income/(loss) from continuing operations before income taxes 259 60 18 (149) — 188 Income/(loss) from continuing operations 259 60 18 (148) — 189 Income from discontinued operations, net of tax — — — 13 — 13 Net income/(loss) 259 60 18 (135) — 202 Net income/(loss) attributable to NRG Energy, Inc. $ 259 $ 60 $ 17 $ (135) $ — $ 201 Six months ended June 30, 2020 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 2,936 $ 1,105 $ 219 $ — $ (3) $ 4,257 Depreciation and amortization 118 66 16 19 — 219 Reorganization costs 1 — — 2 — 3 Gain on sale of assets — — 1 5 — 6 Equity in (losses)/earnings of unconsolidated affiliates (3) — 4 — — 1 Impairment losses on investments (18) — — — — (18) Loss on debt extinguishment, net — (1) — — — (1) Income/(loss) from continuing operations before income taxes 512 170 67 (191) — 558 Income/(loss) from continuing operations 512 170 66 (314) — 434 Net income/(loss) attributable to NRG Energy, Inc $ 512 $ 170 $ 66 $ (314) $ — $ 434 Six months ended June 30, 2019 (In millions) Texas East West/Other Corporate Eliminations Total Operating revenues $ 3,303 $ 1,133 $ 199 $ — $ (5) $ 4,630 Depreciation and amortization 80 56 18 16 — 170 Impairment losses 1 — — — — 1 Reorganization costs 4 — — 11 — 15 Gain on sale of assets — 1 — 1 — 2 Equity in (losses) of unconsolidated affiliates (6) — (15) — — (21) Loss on debt extinguishment, net — — — (47) — (47) Income/(loss) from continuing operations before income taxes 409 159 (5) (276) (1) 286 Income/(loss) from continuing operations 409 159 (5) (279) (1) 283 Income from discontinued operations, net of tax — — — 401 — 401 Net income/(loss) 409 159 (5) 122 (1) 684 Net income/(loss) attributable to NRG Energy, Inc. $ 409 $ 159 $ (6) $ 122 $ (1) $ 683

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The income tax provision consisted of the following: Three months ended June 30, Six months ended June 30, (In millions, except rates) 2020 2019 2020 2019 Income from continuing operations before income taxes $ 414 $ 188 $ 558 $ 286 Income tax expense/(benefit) from continuing operations 101 (1) 124 3 Effective income tax rate 24.4 % (0.5) % 22.2 % 1.0 %

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Summary of NRG's Material Related Party Transactions	The following table summarizes NRG's material related party transactions with third party affiliates: Three months ended June 30, Six months ended June 30, (In millions) 2020 2019 2020 2019 Revenues from Related Parties Included in Operating Revenues Gladstone $ — $ 1 $ 1 $ 1 Ivanpah (a) 10 7 23 18 Midway-Sunset 2 1 3 2 Total $ 12 $ 9 $ 27 $ 21

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	6 Months Ended
	Jun. 30, 2020
Condensed Consolidating Financial Information Disclosure [Abstract]
Schedule of Guarantor Subsidiaries	Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes, Convertible Senior Notes and Senior Secured Notes as of June 30, 2020: Ace Energy, Inc. NRG Distributed Energy Resources Holdings LLC Reliant Energy Retail Services, LLC Allied Home Warranty GP LLC NRG Distributed Generation PR LLC RERH Holdings, LLC Allied Warranty LLC NRG Dunkirk Operations Inc. Saguaro Power LLC Arthur Kill Power LLC NRG ECOKAP Holdings LLC SGE Energy Sourcing, LLC Astoria Gas Turbine Power LLC NRG El Segundo Operations Inc. SGE Texas Holdco, LLC BidURenergy, Inc. NRG Energy Labor Services LLC Somerset Operations Inc. Cabrillo Power I LLC NRG Energy Services Group LLC Somerset Power LLC Cabrillo Power II LLC NRG Energy Services LLC Stream Energy Columbia, LLC Carbon Management Solutions LLC NRG Generation Holdings Inc. Stream Energy Delaware, LLC Cirro Energy Services, Inc. NRG Greenco LLC Stream Energy Illinois, LLC Cirro Group, Inc. NRG Home & Business Solutions LLC Stream Energy Maryland, LLC Connecticut Jet Power LLC NRG Home Services LLC Stream Energy New Jersey, LLC Devon Power LLC NRG Home Solutions LLC Stream Energy New York, LLC Dunkirk Power LLC NRG Home Solutions Product LLC Stream Energy Pennsylvania, LLC Eastern Sierra Energy Company LLC NRG Homer City Services LLC Stream Georgia Gas SPE, LLC El Segundo Power II LLC NRG HQ DG LLC Stream Ohio Gas & Electric, LLC El Segundo Power, LLC NRG Huntley Operations Inc. Stream SPE GP, LLC Energy Alternatives Wholesale, LLC NRG Identity Protect LLC Stream SPE, Ltd. Energy Choice Solutions LLC NRG Ilion Limited Partnership Texas Genco GP, LLC Energy Plus Holdings LLC NRG Ilion LP LLC Texas Genco Holdings, Inc. Energy Plus Natural Gas LLC NRG International LLC Texas Genco LP, LLC Energy Protection Insurance Company NRG Maintenance Services LLC Texas Genco Services, LP Everything Energy LLC NRG Mextrans Inc. US Retailers LLC Forward Home Security, LLC NRG Middletown Operations Inc. Vienna Operations Inc. GCP Funding Company, LLC NRG Montville Operations Inc. Vienna Power LLC Green Mountain Energy Company NRG North Central Operations Inc. WCP (Generation) Holdings LLC Gregory Partners, LLC NRG Norwalk Harbor Operations Inc. West Coast Power LLC Gregory Power Partners LLC NRG Operating Services, Inc. XOOM Alberta Holdings, LLC Huntley Power LLC NRG Oswego Harbor Power Operations Inc. XOOM British Columbia Holdings, LLC Independence Energy Alliance LLC NRG Portable Power LLC XOOM Energy California, LLC Independence Energy Group LLC NRG Power Marketing LLC XOOM Energy Connecticut, LLC Independence Energy Natural Gas LLC NRG Reliability Solutions LLC XOOM Energy Delaware, LLC Indian River Operations Inc. NRG Renter's Protection LLC XOOM Energy Georgia, LLC Indian River Power LLC NRG Retail LLC XOOM Energy Global Holdings, LLC Meriden Gas Turbines LLC NRG Retail Northeast LLC XOOM Energy Illinois LLC Middletown Power LLC NRG Rockford Acquisition LLC XOOM Energy Indiana, LLC Montville Power LLC NRG Saguaro Operations Inc. XOOM Energy Kentucky, LLC NEO Corporation NRG Security LLC XOOM Energy Maine, LLC New Genco GP, LLC NRG Services Corporation XOOM Energy Maryland, LLC Norwalk Power LLC NRG SimplySmart Solutions LLC XOOM Energy Massachusetts, LLC NRG Advisory Services LLC NRG South Central Operations Inc. XOOM Energy Michigan, LLC NRG Affiliate Services Inc. NRG South Texas LP XOOM Energy New Hampshire, LLC NRG Arthur Kill Operations Inc. NRG Texas Gregory LLC XOOM Energy New Jersey, LLC NRG Astoria Gas Turbine Operations Inc. NRG Texas Holding Inc. XOOM Energy New York, LLC NRG Business Services LLC NRG Texas LLC XOOM Energy Ohio, LLC NRG Cabrillo Power Operations Inc. NRG Texas Power LLC XOOM Energy Pennsylvania, LLC NRG California Peaker Operations LLC NRG Warranty Services LLC XOOM Energy Rhode Island, LLC NRG Cedar Bayou Development Company, LLC NRG West Coast LLC XOOM Energy Texas, LLC NRG Connected Home LLC NRG Western Affiliate Services Inc. XOOM Energy Virginia, LLC NRG Construction LLC Oswego Harbor Power LLC XOOM Energy Washington D.C., LLC NRG Curtailment Solutions, Inc. Reliant Energy Northeast LLC XOOM Energy, LLC NRG Development Company Inc. Reliant Energy Power Supply, LLC XOOM Ontario Holdings, LLC NRG Devon Operations Inc. Reliant Energy Retail Holdings, LLC XOOM Solar, LLC NRG Dispatch Services LLC
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS	NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the three months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 2,055 $ 181 $ — $ 2 $ 2,238 Operating Costs and Expenses Cost of operations 1,271 154 7 2 1,434 Depreciation and amortization 80 20 10 — 110 Selling, general and administrative costs 137 7 64 — 208 Development costs — 1 1 — 2 Total operating costs and expenses 1,488 182 82 2 1,754 Operating Income/(Loss) 567 (1) (82) — 484 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 3 — 583 (586) — Equity in earnings of unconsolidated affiliates — 12 — — 12 Other income, net 7 5 2 — 14 Interest expense (4) (2) (90) — (96) Total other income/(expense) 6 15 495 (586) (70) Income from Continuing Operations Before Income Taxes 573 14 413 (586) 414 Income tax expense — 1 100 — 101 Net Income $ 573 $ 13 $ 313 $ (586) $ 313 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 3,833 $ 433 $ — $ (9) $ 4,257 Operating Costs and Expenses Cost of operations 2,561 356 (17) (9) 2,891 Depreciation and amortization 160 39 20 — 219 Selling, general and administrative costs 277 12 128 — 417 Reorganization costs — — 3 — 3 Development costs — 1 4 — 5 Total operating costs and expenses 2,998 408 138 (9) 3,535 Gain on sale of assets — 1 5 — 6 Operating Income/(Loss) 835 26 (133) — 728 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 6 — 845 (851) — Equity in earnings of unconsolidated affiliates — 1 — — 1 Impairment losses on investments — (18) — — (18) Other income, net 10 4 27 — 41 Loss on debt extinguishment, net — — (1) — (1) Interest expense (9) (3) (181) — (193) Total other income/(expense) 7 (16) 690 (851) (170) Income from Continuing Operations Before Income Taxes 842 10 557 (851) 558 Income tax expense — 1 123 — 124 Net Income $ 842 $ 9 $ 434 $ (851) $ 434 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the three months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 2,140 $ 332 $ — $ (7) $ 2,465 Operating Costs and Expenses Cost of operations 1,590 252 10 (7) 1,845 Depreciation and amortization 51 26 8 — 85 Impairment losses 1 — — — 1 Selling, general and administrative costs 112 12 87 — 211 Reorganization costs — — 2 — 2 Development costs — 1 1 — 2 Total operating costs and expenses 1,754 291 108 (7) 2,146 Gain on sale of assets — 1 — — 1 Operating Income/(Loss) 386 42 (108) — 320 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 2 — 430 (432) — Other income, net 4 8 8 — 20 Loss on debt extinguishment, net — — (47) — (47) Interest expense (3) (5) (97) — (105) Total other income/(expense) 3 3 294 (432) (132) Income from Continuing Operations Before Income Taxes 389 45 186 (432) 188 Income tax expense/(benefit) — 1 (2) — (1) Income from Continuing Operations 389 44 188 (432) 189 Income from discontinued operations, net of income tax — — 13 — 13 Net Income 389 44 201 (432) 202 Less: Net income attributable to noncontrolling interest and redeemable noncontrolling interest — 1 — — 1 Net Income Attributable to NRG Energy, Inc. $ 389 $ 43 $ 201 $ (432) $ 201 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Operating Revenues Total operating revenues $ 3,909 $ 727 $ — $ (6) $ 4,630 Operating Costs and Expenses Cost of operations 2,948 535 19 (6) 3,496 Depreciation and amortization 105 49 16 — 170 Impairment losses 1 — — — 1 Selling, general and administrative costs 234 28 143 — 405 Reorganization costs — — 15 — 15 Development costs — 1 3 — 4 Total operating costs and expenses 3,288 613 196 (6) 4,091 Gain on sale of assets 1 1 — — 2 Operating Income/(Loss) 622 115 (196) — 541 Other Income/(Expense) Equity in earnings of consolidated subsidiaries 12 — 729 (741) — Equity in losses of unconsolidated affiliates — (21) — — (21) Other income, net 8 9 15 — 32 Loss on debt extinguishment, net — — (47) — (47) Interest expense (7) (9) (203) — (219) Total other income/(expense) 13 (21) 494 (741) (255) Income from Continuing Operations Before Income Taxes 635 94 298 (741) 286 Income tax expense — 1 2 — 3 Income from Continuing Operations 635 93 296 (741) 283 Income from discontinued operations, net of income tax 9 5 387 — 401 Net Income 644 98 683 (741) 684 Less: Net income attributable to noncontrolling interest and redeemable noncontrolling interest — 1 — — 1 Net Income Attributable to NRG Energy, Inc. $ 644 $ 97 $ 683 $ (741) $ 683 (a) All significant intercompany transactions have been eliminated in consolidation
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME /(LOSS)	NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) For the three months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 573 $ 13 $ 313 $ (586) $ 313 Other Comprehensive Income Foreign currency translation adjustments, net 12 13 13 (25) 13 Defined benefit plans, net 1 — — (1) — Other comprehensive income 13 13 13 (26) 13 Comprehensive Income $ 586 $ 26 $ 326 $ (612) $ 326 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 842 $ 9 $ 434 $ (851) $ 434 Other Comprehensive Loss Foreign currency translation adjustments, net (3) (2) (2) 5 (2) Defined benefit plans, net 3 — — (3) — Other comprehensive loss — (2) (2) 2 (2) Comprehensive Income $ 842 $ 7 $ 432 $ (849) $ 432 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the three months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 389 $ 44 $ 201 $ (432) $ 202 Other Comprehensive Loss Foreign currency translation adjustments, net (1) (1) (1) 2 (1) Available-for-sale securities, net — — 1 — 1 Defined benefit plans, net — — (3) — (3) Other comprehensive loss (1) (1) (3) 2 (3) Comprehensive Income 388 43 198 (430) 199 Less: Comprehensive income attributable to redeemable noncontrolling interest — 1 — — 1 Comprehensive Income Attributable to NRG Energy, Inc. $ 388 $ 42 $ 198 $ (430) $ 198 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Net Income $ 644 $ 98 $ 683 $ (741) $ 684 Other Comprehensive Loss Available-for-sale securities, net — — 1 — 1 Defined benefit plans, net — — (6) — (6) Other comprehensive loss — — (5) — (5) Comprehensive Income 644 98 678 (741) 679 Less: Comprehensive income attributable to redeemable noncontrolling interest — 1 — — 1 Comprehensive Income Attributable to NRG Energy, Inc. $ 644 $ 97 $ 678 $ (741) $ 678 (a) All significant intercompany transactions have been eliminated in consolidation
CONDENSED CONSOLIDATING BALANCE SHEETS	NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ 20 $ 398 $ — $ 418 Funds deposited by counterparties 36 — — — 36 Restricted cash 7 — 1 — 8 Accounts receivable, net 987 111 1,267 (1,350) 1,015 Inventory 306 82 — — 388 Derivative instruments 789 22 — (20) 791 Cash collateral paid in support of energy risk management activities 133 3 — — 136 Prepayments and other current assets 247 10 27 — 284 Total current assets 2,505 248 1,693 (1,370) 3,076 Property, plant and equipment, net 1,336 1,046 151 — 2,533 Other Assets Investment in subsidiaries 170 — 4,525 (4,695) — Equity investments in affiliates — 372 — — 372 Operating lease right-of-use assets, net 73 244 112 — 429 Goodwill 400 179 — — 579 Intangible assets, net 695 38 — — 733 Nuclear decommissioning trust fund 794 — — — 794 Derivative instruments 439 9 — (9) 439 Deferred income taxes 435 (33) 2,768 — 3,170 Other non-current assets 150 27 35 — 212 Total other assets 3,156 836 7,440 (4,704) 6,728 Total Assets $ 6,997 $ 2,130 $ 9,284 $ (6,074) $ 12,337 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Current portion of long-term debt $ 3 $ 4 $ — $ — $ 7 Current portion of operating lease liabilities 19 31 19 — 69 Accounts payable 809 187 1,090 (1,350) 736 Derivative instruments 739 9 — (20) 728 Cash collateral received in support of energy risk management activities 36 — — — 36 Accrued expenses and other current liabilities 296 31 254 — 581 Total current liabilities 1,902 262 1,363 (1,370) 2,157 Other Liabilities Long-term debt 245 24 5,541 — 5,810 Non-current operating lease liabilities 58 290 110 — 458 Nuclear decommissioning reserve 307 — — — 307 Nuclear decommissioning trust liability 478 — — — 478 Derivative instruments 307 1 — (9) 299 Deferred income taxes — 17 — — 17 Other non-current liabilities 421 120 520 — 1,061 Total other liabilities 1,816 452 6,171 (9) 8,430 Total Liabilities 3,718 714 7,534 (1,379) 10,587 Stockholders’ Equity 3,279 1,416 1,750 (4,695) 1,750 Total Liabilities and Stockholders’ Equity $ 6,997 $ 2,130 $ 9,284 $ (6,074) $ 12,337 (a) All significant intercompany transactions have been eliminated in consolidation CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2019 (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ 20 $ 325 $ — $ 345 Funds deposited by counterparties 32 — — — 32 Restricted cash 5 1 2 — 8 Accounts receivable, net 1,293 239 233 (740) 1,025 Inventory 272 111 — — 383 Derivative instruments 856 45 — (41) 860 Cash collateral paid in support of energy risk management activities 182 8 — — 190 Prepayments and other current assets 170 8 67 — 245 Total current assets 2,810 432 627 (781) 3,088 Property, plant and equipment, net 1,483 952 158 — 2,593 Other Assets Investment in subsidiaries 710 — 4,785 (5,495) — Equity investments in affiliates — 388 — — 388 Operating lease right-of-use assets, net 81 261 122 — 464 Goodwill 359 220 — — 579 Intangible assets, net 375 414 — — 789 Nuclear decommissioning trust fund 794 — — — 794 Derivative instruments 308 15 — (13) 310 Deferred income taxes 421 (19) 2,884 — 3,286 Other non-current assets 145 30 65 — 240 Total other assets 3,193 1,309 7,856 (5,508) 6,850 Total Assets $ 7,486 $ 2,693 $ 8,641 $ (6,289) $ 12,531 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Current portion of long-term debt $ — $ 5 $ 83 $ — $ 88 Current portion of operating lease liabilities 20 32 21 — 73 Accounts payable 918 141 403 (740) 722 Derivative instruments 797 25 — (41) 781 Cash collateral received in support of energy risk management activities 32 — — — 32 Accrued expenses and other current liabilities 280 44 339 — 663 Total current liabilities 2,047 247 846 (781) 2,359 Other Liabilities Long-term debt 302 28 5,473 — 5,803 Non-current operating lease liabilities 64 301 118 — 483 Nuclear decommissioning reserve 298 — — — 298 Nuclear decommissioning trust liability 487 — — — 487 Derivative instruments 334 1 — (13) 322 Deferred income taxes — 17 — — 17 Other non-current liabilities 399 153 532 — 1,084 Total other liabilities 1,884 500 6,123 (13) 8,494 Total Liabilities 3,931 747 6,969 (794) 10,853 Redeemable noncontrolling interest in subsidiaries — 20 — — 20 Stockholders’ Equity 3,555 1,926 1,672 (5,495) 1,658 Total Liabilities and Stockholders’ Equity $ 7,486 $ 2,693 $ 8,641 $ (6,289) $ 12,531 (a) All significant intercompany transactions have been eliminated in consolidation
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS	NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the six months ended June 30, 2020 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Cash Flows from Operating Activities Net income $ 842 $ 9 $ 434 $ (851) $ 434 Adjustments to reconcile net income/(loss) to cash provided by operating activities: Distributions from and equity in earnings/(losses) of unconsolidated affiliates and consolidated subsidiaries (6) 7 (845) 851 7 Depreciation and amortization 160 39 20 — 219 Accretion of asset retirement obligations 10 8 — — 18 Provision for credit losses 47 1 — — 48 Amortization of nuclear fuel 25 — — — 25 Amortization of financing costs and debt discount/premiums — — 12 — 12 Loss on debt extinguishment, net — — 1 — 1 Amortization of emission allowances and energy credits 24 9 — — 33 Amortization of unearned equity compensation — — 12 — 12 Net gain on sale of assets and disposal of assets (9) (1) (5) — (15) Impairment losses — 18 — — 18 Changes in derivative instruments (144) 13 — — (131) Changes in deferred income taxes and liability for uncertain tax benefits 1,212 (154) (942) — 116 Changes in collateral deposits in support of energy risk management activities 53 5 — — 58 Changes in nuclear decommissioning trust liability 36 — — — 36 Changes in other working capital (124) (19) (56) — (199) Net Cash Provided/(Used) by Operating Activities 2,126 (65) (1,369) — 692 Cash Flows from Investing Activities Intercompany dividends — — 1,889 (1,889) — Payments for acquisitions of businesses (5) — — — (5) Capital expenditures (78) (20) (18) — (116) Net purchases of emission allowances (4) — — — (4) Investments in nuclear decommissioning trust fund securities (257) — — — (257) Proceeds from the sale of nuclear decommissioning trust fund securities 220 — — — 220 Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 10 — 5 — 15 Net contributions to investments in unconsolidated affiliates — 2 — — 2 Net Cash (Used)/Provided by Investing Activities (114) (18) 1,876 (1,889) (145) Cash Flows from Financing Activities Intercompany dividends and transfers (1,941) 86 (34) 1,889 — Payments of dividends to common stockholders — — (148) — (148) Payments for share repurchase activity — — (229) — (229) Purchase of and distributions to noncontrolling interests from subsidiaries — (2) — — (2) Proceeds from issuance of common stock — — 1 — 1 Proceeds from issuance of long-term debt — — 59 — 59 Payment of debt issuance costs — — (1) — (1) Repayments of long-term debt (60) (1) — — (61) Net repayment of Revolving Credit Facility — — (83) — (83) Other (5) — — — (5) Net Cash (Used)/Provided by Financing Activities (2,006) 83 (435) 1,889 (469) Effect of exchange rate changes on cash and cash equivalents — (1) — — (1) Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 6 (1) 72 — 77 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 37 21 327 — 385 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 43 $ 20 $ 399 $ — $ 462 (a) All significant intercompany transactions have been eliminated in consolidation NRG ENERGY, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the six months ended June 30, 2019 (Unaudited) (In millions) Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Energy, Inc. Eliminations (a) Consolidated Cash Flows from Operating Activities Net income $ 644 $ 98 $ 683 $ (741) $ 684 Income from discontinued operations 9 5 387 — 401 Income from continuing operations 635 93 296 (741) 283 Adjustments to reconcile net income to cash provided by operating activities: Distributions from and equity in earnings/(losses) of unconsolidated affiliates and consolidated subsidiaries (12) 22 (729) 741 22 Depreciation and amortization 104 50 16 — 170 Accretion of asset retirement obligations 11 3 — — 14 Provision for credit losses 42 4 6 — 52 Amortization of nuclear fuel 27 — — — 27 Amortization of financing costs and debt discount/premiums — — 13 — 13 Loss on debt extinguishment, net — — 47 — 47 Amortization of emission allowances and energy credits 13 1 — — 14 Amortization of unearned equity compensation — — 10 — 10 Net loss on sale of assets and disposal of assets (3) 1 3 — 1 Impairment losses 1 — — — 1 Changes in derivative instruments (28) (32) 38 — (22) Changes in deferred income taxes and liability for uncertain tax benefits — (3) (2) — (5) Changes in collateral deposits in support of energy risk management activities 128 (3) — — 125 Changes in nuclear decommissioning trust liability 17 — — — 17 Changes in other working capital (343) (64) 55 — (352) Cash provided/(used) by continuing operations 592 72 (247) — 417 Cash provided/(used) by discontinued operations 17 (9) — — 8 Net Cash Provided/(Used) by Operating Activities 609 63 (247) — 425 Cash Flows from Investing Activities Intercompany dividends — — 2,209 (2,209) — Payments for acquisitions of businesses (21) — — — (21) Capital expenditures (77) (15) (15) — (107) Net purchases of emission allowances (1) — — — (1) Investments in nuclear decommissioning trust fund securities (209) — — — (209) Proceeds from the sale of nuclear decommissioning trust fund securities 191 — — — 191 Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 1 400 888 — 1,289 Net distributions from investments in unconsolidated affiliates — 7 — — 7 Contributions to discontinued operations — (44) — — (44) Cash (used)/provided by continuing operations (116) 348 3,082 (2,209) 1,105 Cash used by discontinued operations — (2) — — (2) Net Cash (Used)/Provided by Investing Activities (116) 346 3,082 (2,209) 1,103 Cash Flows from Financing Activities Intercompany dividends and transfers (532) (375) (1,302) 2,209 — Payment of dividends to common stockholders — — (16) — (16) Payments for share repurchase activity — — (1,075) — (1,075) Payments for debt extinguishment — — (24) — (24) Net distributions to noncontrolling interests from subsidiaries — (1) — — (1) Proceeds from issuance of common stock — — 2 — 2 Proceeds from issuance of long-term debt — — 1,833 — 1,833 Payment of debt issuance costs — — (33) — (33) Payments for long-term debt — (53) (2,432) — (2,485) Cash used by continuing operations (532) (429) (3,047) 2,209 (1,799) Cash provided by discontinued operations — 43 — — 43 Net Cash Used by Financing Activities (532) (386) (3,047) 2,209 (1,756) Change in cash from discontinued operations 17 32 — — 49 Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (56) (9) (212) — (277) Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 95 38 480 — 613 Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 39 $ 29 $ 268 $ — $ 336 (a) All significant intercompany transactions have been eliminated in consolidation

Nature of Business and Basis _2

Nature of Business and Basis of Presentation - General (Details) MW in Thousands	Jun. 30, 2020MW
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Generation capacity (in MW)	23

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Other Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Property, plant and equipment accumulated depreciation	$ 1,868	$ 1,752
Intangible assets accumulated amortization	$ 1,279	$ 1,262

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 39	$ 43
Provision for credit losses	24	48	$ 52
Write-offs	(20)	(52)
Recoveries collected	4	8
Ending balance	$ 47	$ 47

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 418	$ 345
Funds deposited by counterparties	36	32
Restricted cash	8	8
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows	$ 462	$ 385	$ 336	$ 613

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Pension Plan Contributions (Details) $ in Millions	Jun. 30, 2020USD ($)
Accounting Policies [Abstract]
Pension plan employer contributions deferred until 2021 due to CARES Act	$ 47

Revenue Recognition - Performan

Revenue Recognition - Performance Obligations Expected Timing of Satisfaction (Details) $ in Millions	Jun. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 314
Revenue remaining performance obligation period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 620
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 307
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 42
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 8
Revenue remaining performance obligation period	1 year

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,124	$ 1,783	$ 4,049	$ 3,562
Mark-to-market for economic hedging activities	87	21	131	41
Operating revenues	2,238	2,465	4,257	4,630
Lease revenue	5	5	10	10
Derivative revenue	86	33	141	60
Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(2)	(3)	(5)
Operating revenues	0	(3)	(3)	(5)
Lease revenue	0	0	0	0
Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,832	1,685	3,493	3,274
Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	(1)	(1)	(3)
Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	236	207	526
Derivative revenue	11	380	64	700
Energy revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	0	(2)	1
Derivative revenue	(1)	0	(2)	0
Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	195	201	344	357
Derivative revenue	41	30	65	48
Capacity revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Derivative revenue	0	1	0	1
Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	43	241	39	261
Derivative revenue	109	677	198	1,058
Derivative revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	2	(1)	3	(1)
Derivative revenue	1	0	0	0
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85	102	174	212
Other revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	0	(3)	(2)
Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	2,238	2,465	4,257	4,630
Total operating revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	0	(2)	(3)	(5)
Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	14	26	30	49
Other revenue, derivative | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	(1)	0
Mass customers | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,564	1,395	2,942	2,708
Mass customers | Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	(1)	(1)	(3)
Business Solutions customers | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	268	290	551	566
Business Solutions customers | Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Texas | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,571	1,258	2,922	2,409
Operating revenues	1,578	1,837	2,936	3,303
Lease revenue	0	0	0	0
Texas | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,521	1,433	2,813	2,686
Texas | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	136	10	241
Derivative revenue	0	355	0	626
Texas | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Derivative revenue	0	0	0	0
Texas | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	210	0	241
Derivative revenue	7	579	14	894
Texas | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	58	113	135
Texas | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Operating revenues	1,578	1,837	2,936	3,303
Texas | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	7	14	14	27
Texas | Mass customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,273	1,161	2,305	2,156
Texas | Business Solutions customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	248	272	508	530
East | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	480	459	980	1,014
Operating revenues	566	524	1,105	1,133
Lease revenue	1	1	1	1
East | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	311	253	681	591
East | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	48	64	174
Derivative revenue	2	20	37	67
East | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	179	195	313	339
Derivative revenue	41	29	65	47
East | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	40	16	20	1
Derivative revenue	85	64	124	118
East | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	12	27	28
East | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Operating revenues	566	524	1,105	1,133
East | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	2	(1)	2	3
East | Mass customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	291	235	638	555
East | Business Solutions customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	18	43	36
West/Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	68	150	144
Operating revenues	94	106	219	199
Lease revenue	4	4	9	9
West/Other | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
West/Other | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	60	52	135	110
Derivative revenue	10	5	29	7
West/Other | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	6	31	18
Derivative revenue	0	0	0	0
West/Other | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	1	16	16	20
Derivative revenue	16	34	60	46
West/Other | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	32	37	51
West/Other | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Operating revenues	94	106	219	199
West/Other | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	5	13	15	19
West/Other | Mass customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
West/Other | Business Solutions customers | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

Revenue Recognition - Contract

Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule Of Contract Assets And Liabilities [Line Items]
Deferred customer acquisition costs	$ 133		$ 133		$ 133
Total accounts receivable, net	1,015		1,015		1,025
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)	328		328		402
Deferred revenues	84		84		82
Deferred revenue from contract with customers	33				24
Revenue recognized	25	$ 19	13	$ 13
Accounts receivable, net - Contracts with customers
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	981		981		1,002
Accounts receivable, net - Derivative instruments
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	30		30		18
Accounts receivable, net - Affiliate
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	$ 4		$ 4		$ 5

Acquisitions, Discontinued Op_3

Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details) - Stream Energy Acquisition customer in Thousands, $ in Millions	Aug. 01, 2019USD ($)customerstate
Business Acquisition [Line Items]
States in which entity operates | state	9
Cash paid to acquire business | $	$ 329
Working capital and other adjustment | $	$ 29
Increase in retail portfolio by RCE's acquired | customer	600
Customers acquired | customer	450

Acquisitions, Discontinued Op_4

Acquisitions, Discontinued Operations and Dispositions - Purchase Price Allocation (Details) - USD ($) $ in Millions	Aug. 01, 2019	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 579	$ 579
Stream Energy Acquisition
Business Acquisition [Line Items]
Account receivable	$ 98
Accounts payable	(73)
Other net current and non-current working capital	5
Goodwill	6
Stream Purchase Price	329
Stream Energy Acquisition | Texas
Business Acquisition [Line Items]
Goodwill	5
Stream Energy Acquisition | East
Business Acquisition [Line Items]
Goodwill	1
Stream Energy Acquisition | Marketing Partnerships
Business Acquisition [Line Items]
Finite-lived intangibles	154
Stream Energy Acquisition | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles	85
Stream Energy Acquisition | Trade Names
Business Acquisition [Line Items]
Finite-lived intangibles	28
Stream Energy Acquisition | Other Intangible Assets
Business Acquisition [Line Items]
Finite-lived intangibles	$ 26

Acquisitions, Discontinued Op_5

Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations Narrative (Details) $ in Millions	Feb. 06, 2018USD ($)extension	Jun. 30, 2020USD ($)MW	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)	Feb. 04, 2019USD ($)MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generation capacity (in MW) | MW		23,000
South Central Portfolio | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration					$ 1,000
Generation capacity (in MW) | MW					1,153
Carlsbad Energy Holdings LLC | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration	$ 385
Percentage of ownership sold	100.00%
Lease and easement agreement, number of extensions | extension	2
Lease renewal term	10 years
Additional commitments related to project		$ 23		$ 23
Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from other asset sales		$ 15	$ 18

Acquisitions, Discontinued Op_6

Acquisitions, Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from discontinued operations, net of tax	$ 0	$ 13	$ 0	$ 401
Discontinued Operations, Disposed of by Sale | South Central Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		0		31
Operating costs and expenses		0		(23)
Gain from operations of discontinued components		0		8
Gain on/from disposal of discontinued operation, net of tax		1		28
Gain from discontinued operations, net of tax		1		36
Discontinued Operations, Disposed of by Sale | Carlsbad Energy Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		0		19
Operating costs and expenses		0		(9)
Other expense		0		(5)
Gain from operations of discontinued components		0		5
(Loss)/gain on disposal of discontinued operations, net of tax		(17)		331
Other Commitments, Indemnification and Fees		27		27
Gain on/from disposal of discontinued operation, net of tax		10		358
Gain from discontinued operations, net of tax		10		363
Discontinued Operations | GenOn
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on/from disposal of discontinued operation, net of tax		$ 2		$ 2

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Estimated Carrying Amounts and Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	$ 5,957	$ 6,042
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	10	11
Long-term debt, including current portion	5,878	5,956
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	7	8
Long-term debt, including current portion	6,208	6,504
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	6,176	6,388
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	$ 32	$ 116

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	$ 13	$ 20
Other trust fund investments:
U.S. government and federal agency obligations	1	1
Measured using net asset value practical expedient:
Total assets	2,045	1,993
Derivative liabilities:
Derivative liabilities	1,027	1,103
Commodity contracts
Derivative assets:
Derivative assets	1,230	1,170
Derivative liabilities:
Derivative liabilities	1,027	1,103
Cash and cash equivalents
Nuclear trust fund investments:
Nuclear trust fund investments	26	17
U.S. government and federal agency obligations
Nuclear trust fund investments:
Nuclear trust fund investments	48	68
Federal agency mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	87	100
Commercial mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	38	29
Corporate debt securities
Nuclear trust fund investments:
Nuclear trust fund investments	148	109
Equity securities
Nuclear trust fund investments:
Nuclear trust fund investments	371	388
Measured using net asset value practical expedient:
Equity contracts	7	8
Foreign government fixed income securities
Nuclear trust fund investments:
Nuclear trust fund investments	7	5
Equity securities — nuclear trust fund investments
Measured using net asset value practical expedient:
Equity contracts	69	78
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	0	0
Other trust fund investments:
U.S. government and federal agency obligations	1	1
Measured using net asset value practical expedient:
Total assets	532	558
Derivative liabilities:
Derivative liabilities	151	143
Level 1 | Commodity contracts
Derivative assets:
Derivative assets	87	84
Derivative liabilities:
Derivative liabilities	151	143
Level 1 | Cash and cash equivalents
Nuclear trust fund investments:
Nuclear trust fund investments	26	17
Level 1 | U.S. government and federal agency obligations
Nuclear trust fund investments:
Nuclear trust fund investments	47	68
Level 1 | Federal agency mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 1 | Commercial mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 1 | Corporate debt securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 1 | Equity securities
Nuclear trust fund investments:
Nuclear trust fund investments	371	388
Level 1 | Foreign government fixed income securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	13	20
Other trust fund investments:
U.S. government and federal agency obligations	0	0
Measured using net asset value practical expedient:
Total assets	971	1,156
Derivative liabilities:
Derivative liabilities	562	805
Level 2 | Commodity contracts
Derivative assets:
Derivative assets	677	893
Derivative liabilities:
Derivative liabilities	562	805
Level 2 | Cash and cash equivalents
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 2 | U.S. government and federal agency obligations
Nuclear trust fund investments:
Nuclear trust fund investments	1	0
Level 2 | Federal agency mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	87	100
Level 2 | Commercial mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	38	29
Level 2 | Corporate debt securities
Nuclear trust fund investments:
Nuclear trust fund investments	148	109
Level 2 | Equity securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 2 | Foreign government fixed income securities
Nuclear trust fund investments:
Nuclear trust fund investments	7	5
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	0	0
Other trust fund investments:
U.S. government and federal agency obligations	0	0
Measured using net asset value practical expedient:
Total assets	466	193
Derivative liabilities:
Derivative liabilities	314	155
Level 3 | Commodity contracts
Derivative assets:
Derivative assets	466	193
Derivative liabilities:
Derivative liabilities	314	155
Level 3 | Cash and cash equivalents
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | U.S. government and federal agency obligations
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | Federal agency mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | Commercial mortgage-backed securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | Corporate debt securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | Equity securities
Nuclear trust fund investments:
Nuclear trust fund investments	0	0
Level 3 | Foreign government fixed income securities
Nuclear trust fund investments:
Nuclear trust fund investments	$ 0	$ 0

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		$ 16		$ 39
Contracts added from acquisitions		(1)		(1)
Total gains/(losses) — realized/unrealized included in earnings		(16)		(26)
Cash received		0		(1)
Purchases		(10)		(12)
Transfers into Level 3		113		130
Transfers out of Level 3		14		(13)
Ending balance		116		116
Gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held		(18)		(30)
Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		18		19
Contracts added from acquisitions		0		0
Total gains/(losses) — realized/unrealized included in earnings		1		1
Cash received		0		(1)
Purchases		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Ending balance		19		19
Gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held		1		1
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 73	(2)	$ 38	20
Contracts added from acquisitions		(1)		(1)
Total gains/(losses) — realized/unrealized included in earnings	52	(17)	74	(27)
Cash received		0		0
Purchases	8	(10)	16	(12)
Transfers into Level 3	25	113	33	130
Transfers out of Level 3	(6)	14	(9)	(13)
Ending balance	152	97	152	97
Gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held	$ 36	$ (19)	$ 27	$ (31)

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Derivative Fair Value Measurements, Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
Fair Value Disclosures [Abstract]
Total derivative assets valued with prices provided by models and other valuation techniques (as a percent)	38.00%
Total derivative liabilities valued with prices provided by models and other valuation techniques (as a percent)	31.00%
Decrease in cost of operations	$ 1

Fair Value of Financial Instr_7

Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Jun. 30, 2020USD ($)$ / MWh	Dec. 31, 2019USD ($)$ / MWh
Liabilities
Derivative liabilities	$ 1,027	$ 1,103
Level 3
Liabilities
Derivative liabilities	314	155
Commodity contracts
Assets
Derivative assets	1,230	1,170
Liabilities
Derivative liabilities	1,027	1,103
Commodity contracts | Level 3
Assets
Derivative assets	466	193
Liabilities
Derivative liabilities	314	155
Commodity contracts | Level 3 | Power Contracts
Assets
Derivative assets	431	151
Liabilities
Derivative liabilities	$ 306	$ 139
Commodity contracts | Level 3 | Power Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	4	8
Commodity contracts | Level 3 | Power Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	181	218
Commodity contracts | Level 3 | Power Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	26	24
Commodity contracts | Level 3 | FTRs
Assets
Derivative assets	$ 35	$ 42
Liabilities
Derivative liabilities	$ 8	$ 16
Commodity contracts | Level 3 | FTRs | Low
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	(55)	(105)
Commodity contracts | Level 3 | FTRs | High
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	48	213
Commodity contracts | Level 3 | FTRs | Weighted Average
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	0	0

Fair Value of Financial Instr_8

Fair Value of Financial Instruments - Counterparty Credit Risk (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)counterparty
Concentration of Credit Risk
Counterparty credit exposure to a portion of the Company's counterparties	$ 339
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties	76
Net counterparty credit exposure to a portion of the Company's counterparties	$ 263
Company's exposure before collateral is expected to roll off by the end of 2019 (as a percent)	49.00%
Net exposure (as a percent)	100.00%
Counterparty credit risk exposure	$ 57
Wholesale counterparty with net exposure | counterparty	2
Counterparty credit risk exposure to certain counterparties, threshold (as a percent)	10.00%
Estimated counterparty credit risk exposure to certain counterparties	$ 672
Period of estimated counterparty credit risk exposure, years	5 years
Investment grade
Concentration of Credit Risk
Net exposure (as a percent)	59.00%
Non-investment grade/non-rated
Concentration of Credit Risk
Net exposure (as a percent)	41.00%
Utilities, energy merchants, marketers and other
Concentration of Credit Risk
Net exposure (as a percent)	77.00%
Financial institutions
Concentration of Credit Risk
Net exposure (as a percent)	23.00%

Nuclear Decommissioning Trust_3

Nuclear Decommissioning Trust Fund - Narrative (Details)	Jun. 30, 2020
STP
Nuclear decommissioning trust fund
Ownership interest as percentage	44.00%

Nuclear Decommissioning Trust_4

Nuclear Decommissioning Trust Fund - Summary of aggregate fair values and realized gains and losses (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Nuclear decommissioning trust fund
Fair Value	$ 794	$ 794
Unrealized Gains	325	338
Unrealized Losses	1	1
Cash and cash equivalents
Nuclear decommissioning trust fund
Fair Value	26	17
Unrealized Gains	0	0
Unrealized Losses	0	0
U.S. government and federal agency obligations
Nuclear decommissioning trust fund
Fair Value	48	68
Unrealized Gains	8	4
Unrealized Losses	$ 0	$ 0
Weighted-average Maturities (In years)	13 years	11 years
Federal agency mortgage-backed securities
Nuclear decommissioning trust fund
Fair Value	$ 87	$ 100
Unrealized Gains	4	3
Unrealized Losses	$ 0	$ 0
Weighted-average Maturities (In years)	24 years	24 years
Commercial mortgage-backed securities
Nuclear decommissioning trust fund
Fair Value	$ 38	$ 29
Unrealized Gains	2	1
Unrealized Losses	$ 0	$ 1
Weighted-average Maturities (In years)	27 years	24 years
Corporate debt securities
Nuclear decommissioning trust fund
Fair Value	$ 148	$ 109
Unrealized Gains	12	6
Unrealized Losses	$ 1	$ 0
Weighted-average Maturities (In years)	12 years	11 years
Equity securities
Nuclear decommissioning trust fund
Fair Value	$ 440	$ 466
Unrealized Gains	298	324
Unrealized Losses	0	0
Foreign government fixed income securities
Nuclear decommissioning trust fund
Fair Value	7	5
Unrealized Gains	1	0
Unrealized Losses	$ 0	$ 0
Weighted-average Maturities (In years)	10 years	10 years

Nuclear Decommissioning Trust_5

Nuclear Decommissioning Trust Fund - Summary of proceeds from sales of available-for-sale securities and related gains and losses (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Regulated Operations [Abstract]
Realized gains	$ 7	$ 5
Realized losses	(9)	(5)
Proceeds from sale of securities	$ 220	$ 191

Accounting for Derivative Ins_3

Accounting for Derivative Instruments and Hedging Activities - Net notional volume buy/sell of open derivative transactions (Details) shares in Millions, T in Millions, MWh in Millions, MMBTU in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020MMBTUMWhTshares	Dec. 31, 2019MMBTUMWhTshares
Long | Emissions
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	1	3
Long | Renewable Energy Certificates
Volumetric Underlying Derivative Transactions
Derivative, non-monetary notional amount (in shares) | shares	1	1
Long | Coal
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	5	10
Long | Power
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MWh	(56)	(38)
Short | Natural Gas
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU	(237)	(181)
Short | Capacity
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU	(1)	(1)

Accounting for Derivative Ins_4

Accounting for Derivative Instruments and Hedging Activities - Fair value within the derivative instrument valuation (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Liabilities	$ 1,027	$ 1,103
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Assets	1,230	1,170
Derivative Liabilities	1,027	1,103
Not Designated as Hedging Instrument | Commodity contracts current
Derivative [Line Items]
Derivative Assets	791	860
Derivative Liabilities	728	781
Not Designated as Hedging Instrument | Commodity contracts long-term
Derivative [Line Items]
Derivative Assets	439	310
Derivative Liabilities	$ 299	$ 322

Accounting for Derivative Ins_5

Accounting for Derivative Instruments and Hedging Activities - Offsetting of derivatives by counterparty master agreement level and collateral received (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held) / Posted	$ (36)	$ (32)
Derivative liabilities	(1,027)	(1,103)
Cash Collateral Posted	136	190
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	1,230	1,170
Derivative Instruments	(921)	(909)
Cash Collateral (Held) / Posted	(22)	(7)
Net Amount	287	254
Derivative liabilities	(1,027)	(1,103)
Derivative Instruments	921	909
Cash Collateral Posted	38	73
Net Amount	(68)	(121)
Gross Amounts of Recognized Assets / Liabilities	203	67
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	16	66
Net Amount	$ 219	$ 133

Accounting for Derivative Ins_6

Accounting for Derivative Instruments and Hedging Activities - Pre-tax effects of economic hedges not designated a cash flow hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	$ 30	$ 11	$ 39	$ 30
Reversal of acquired loss/(gain) positions related to economic hedges	3	1	4	(1)
Net unrealized gains on open positions related to economic hedges	54	9	88	12
Total unrealized mark-to-market gains for economic hedging activities	87	21	131	41
Reversal of previously recognized unrealized (gains) on settled positions related to trading activity	(5)	(1)	(7)	(7)
Net unrealized gains on open positions related to trading activity	4	13	17	26
Total unrealized mark-to-market (losses)/gains for trading activity	(1)	12	10	19
Total unrealized gains	86	33	141	60
Credit Risk Related Contingent Features
Unrealized gains from open economic hedge positions			88	12
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	8		8
Adequate Assurance Clauses
Credit Risk Related Contingent Features
Derivative net liability position, collateral required for contracts with credit rating contingent feature	33		33
Commodity contracts
Unrealized mark-to-market results
Total unrealized gains	86	33	141	60
Commodity contracts | Operating revenues
Unrealized mark-to-market results
Total unrealized gains	42	253	49	280
Commodity contracts | Cost of operations
Unrealized mark-to-market results
Total unrealized gains	44	(220)	92	(220)
Interest rate contracts
Unrealized mark-to-market results
Total unrealized gains	$ 0	$ (29)	$ 0	$ (38)

Impairments (Details)

Impairments (Details) - Petra Nova - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Impairment losses	$ 18
Letters of credit issued		$ 12

Long-term Debt - Schedule of Lo

Long-term Debt - Schedule of Long-term Debt (Details) $ / shares in Units, $ in Millions	Jul. 31, 2020$ / shares	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)	Mar. 11, 2020
Debt Instrument [Line Items]
Debt amount		$ 6,042	$ 5,957
Long-term Debt, Current Maturities		(88)	(7)
Less debt issuance costs		(65)	(61)
Discounts		(86)	(79)
Long-term debt		5,803	5,810
Recourse Debt
Debt Instrument [Line Items]
Debt amount		6,008	5,925
Recourse Debt | Senior Notes, due 2026
Debt Instrument [Line Items]
Debt amount		1,000	$ 1,000
Interest rate, stated percentage			7.25%
Recourse Debt | Senior Notes, due 2027
Debt Instrument [Line Items]
Debt amount		1,230	$ 1,230
Interest rate, stated percentage			6.625%
Recourse Debt | Senior Notes, due 2028
Debt Instrument [Line Items]
Debt amount		821	$ 821
Interest rate, stated percentage			5.75%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Debt amount		733	$ 733
Interest rate, stated percentage			5.25%
Recourse Debt | Convertible Senior Notes Due 2048
Debt Instrument [Line Items]
Debt amount		575	$ 575
Interest rate, stated percentage			2.75%
Recourse Debt | Convertible Senior Notes Due 2048 | Subsequent Event
Debt Instrument [Line Items]
Convertible Notes, conversion price (in usd per share) | $ / shares	$ 46.65
Conversion rate	0.02144
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Debt amount		600	$ 600
Interest rate, stated percentage			3.75%
Recourse Debt | Senior Secured First Lien Notes, due 2029
Debt Instrument [Line Items]
Debt amount		500	$ 500
Interest rate, stated percentage			4.45%
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Debt amount		466	$ 466
Recourse Debt | Tax-exempt bonds | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage			1.30%	1.30%
Recourse Debt | Tax-exempt bonds | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage			6.00%
Line of Credit | Revolving Credit Facility | Revolver Facility
Debt Instrument [Line Items]
Debt amount		$ 83	$ 0
Line of Credit | Revolving Credit Facility | Revolver Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Non Recourse Debt
Debt Instrument [Line Items]
Debt amount		$ 34	32
Non Recourse Debt | Other
Debt Instrument [Line Items]
Debt amount		$ 34	$ 32

Long-term Debt - Recourse Debt

Long-term Debt - Recourse Debt (Details) - USD ($)	Jun. 30, 2020	Mar. 11, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt amount	$ 5,957,000,000		$ 6,042,000,000
Recourse Debt
Debt Instrument [Line Items]
Debt amount	5,925,000,000		6,008,000,000
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Debt amount	$ 466,000,000		466,000,000
Debt issuance amount		$ 59,000,000
Recourse Debt | Dunkirk Power LLC Tax Exempt Bonds Due 2042
Debt Instrument [Line Items]
Interest rate, stated percentage	5.875%
Revolving Credit Facility | Line of Credit | Revolver Facility
Debt Instrument [Line Items]
Debt amount	$ 0		$ 83,000,000

Long-term Debt - Non Recourse D

Long-term Debt - Non Recourse Debt (Details) - Credit Agreement - Letter of Credit - USD ($)	Jan. 04, 2019	Jun. 30, 2020
Debt Instrument [Line Items]
Credit agreement	$ 80,000,000
Facility fees	1.33%
Letters of credit issued		$ 80,000,000

Investments Accounted for Usi_3

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Investments Accounted for by the Equity Method
Equity investments in affiliates		$ 372	$ 388
Current assets		3,076	3,088
Property, plant and equipment, net		2,533	2,593
Other non-current assets		212	240
Total Assets		12,337	12,531
Current liabilities		2,157	2,359
Long-term debt		5,957	6,042
Other non-current liabilities		1,061	1,084
Total Liabilities		10,587	10,853
Variable Interest Entity, Primary Beneficiary
Investments Accounted for by the Equity Method
Current assets		1	3
Property, plant and equipment, net		0	71
Other non-current assets		25	27
Total Assets		26	101
Current liabilities		4	4
Long-term debt		24	24
Other non-current liabilities		4	8
Total Liabilities		32	36
Redeemable noncontrolling interest		0	20
Net Assets Less Noncontrolling Interest		(6)	$ 45
Agua Caliente
Investments Accounted for by the Equity Method
Equity investments in affiliates		220
Ivampah Master Holdings LLC
Investments Accounted for by the Equity Method
Equity investments in affiliates		$ 10
Subsequent Event | Agua Caliente
Investments Accounted for by the Equity Method
Ownership interest	35.00%

Changes in Capital Structure -

Changes in Capital Structure - Narrative (Details) - shares	1 Months Ended	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Jun. 30, 2020
Equity [Abstract]
Common stock, shares authorized (in shares)		500,000,000	500,000,000
Long-term capital allocation, target allocation, cash generated allocated to growth investments, percentage		50.00%
Long-term capital allocation, target allocation, cash generated allocated returned to shareholders, percentage		50.00%
Employee Stock Purchase Plan, minimum percentage of eligible compensation to purchase shares	1.00%
Employee Stock Purchase Plan, maximum percentage of eligible compensation	10.00%
Employee Stock Purchase Plan, exercise price as percentage of fair value	95.00%

Changes in Capital Structure _2

Changes in Capital Structure - Changes in NRG's common stock issued and outstanding (Details)	6 Months Ended
	Jun. 30, 2020shares
Schedule of Stock by Class, Equity [Roll Forward]
Balance as of beginning of period (in shares)	421,890,790
Treasury shares, balance as of beginning of period (in shares)	(172,894,601)
Outstanding, as of beginning of period (in shares)	248,996,189
Shares issued under LTIPs (in shares)	1,140,987
Stock issued under ESPP (in shares)	63,455
Shares repurchased (in shares)	(6,062,783)
Balance as of end of period (in shares)	423,031,777
Treasury shares, balance as of end of the period (in shares)	(178,893,929)
Outstanding, as of end of period (in shares)	244,137,848
Common Stock
Schedule of Stock by Class, Equity [Roll Forward]
Balance as of beginning of period (in shares)	421,890,790
Shares issued under LTIPs (in shares)	1,140,987
Stock issued under ESPP (in shares)	0
Shares repurchased (in shares)	0
Balance as of end of period (in shares)	423,031,777
Treasury
Schedule of Stock by Class, Equity [Roll Forward]
Treasury shares, balance as of beginning of period (in shares)	(172,894,601)
Shares issued under LTIPs (in shares)	0
Stock issued under ESPP (in shares)	63,455
Shares repurchased (in shares)	(6,062,783)
Treasury shares, balance as of end of the period (in shares)	(178,893,929)

Changes in Capital Structure _3

Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)$ / sharesshares
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,062,783
Capital Allocation Plan, Open Market Repurchases
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,062,783
Amounts paid for shares purchased | $	$ 197
Equivalent Shares In Lieu Of Tax Withholding on Equity Compensation Issuances
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	710,474
Average price paid per share (in usd per share) | $ / shares	$ 38.24
Amounts paid for shares purchased | $	$ 27
Capital Allocation Plan
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,773,257
Average price paid per share (in usd per share) | $ / shares	$ 33.05
Amounts paid for shares purchased | $	$ 224

Changes in Capital Structure _4

Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares	Jul. 17, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)			$ 1.20			$ 0.12
Dividends per common share (in usd per share)		$ 0.30	$ 0.30	$ 0.03	$ 0.03
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.30
Minimum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			700.00%
Maximum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			9.00%

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic income per share:
Net income attributable to NRG Energy, Inc.	$ 313	$ 121	$ 201	$ 482	$ 434	$ 683
Weighted average number of common shares outstanding — basic (in shares)	245		265		246	272
Income/(loss) per weighted average common share — basic (in usd per share)	$ 1.28		$ 0.76		$ 1.76	$ 2.51
Diluted income per share:
Net income available to common shareholders	$ 313		$ 201		$ 434	$ 683
Weighted average number of common shares outstanding - diluted (in shares)	245		265		246	272
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	1		2		1	2
Weighted average number of common shares outstanding- dilutive (in shares)	246		267		247	274
Income/(loss) per weighted average common share — diluted (in usd per share)	$ 1.27		$ 0.75		$ 1.76	$ 2.49

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information
Operating revenues	$ 2,238		$ 2,465		$ 4,257	$ 4,630
Depreciation and amortization	110		85		219	170
Impairment losses	0		1		0	1
Reorganization costs	0		2		3	15
Gain on sale of assets			1		6	2
Equity in (losses)/earnings of unconsolidated affiliates	12		0		1	(21)
Impairment losses on investments	0		0		(18)	0
Loss on debt extinguishment, net	0		(47)		(1)	(47)
Income from Continuing Operations Before Income Taxes	414		188		558	286
Income/(loss) from continuing operations	313		189		434	283
Income from discontinued operations, net of tax	0		13		0	401
Net Income	313		202		434	684
Net income attributable to NRG Energy, Inc.	313	$ 121	201	$ 482	434	683
Eliminations
Segment Reporting Information
Operating revenues	0		(3)		(3)	(5)
Depreciation and amortization	0		0		0	0
Impairment losses			0			0
Reorganization costs			0		0	0
Gain on sale of assets			0		0	0
Equity in (losses)/earnings of unconsolidated affiliates	0		0		0	0
Impairment losses on investments					0
Loss on debt extinguishment, net			0		0	0
Income from Continuing Operations Before Income Taxes	1		0		0	(1)
Income/(loss) from continuing operations	1		0		0	(1)
Income from discontinued operations, net of tax			0			0
Net Income			0			(1)
Net income attributable to NRG Energy, Inc.	1		0		0	(1)
Texas | Operating Segments
Segment Reporting Information
Operating revenues	1,578		1,837		2,936	3,303
Depreciation and amortization	59		40		118	80
Impairment losses			1			1
Reorganization costs			3		1	4
Gain on sale of assets			0		0	0
Equity in (losses)/earnings of unconsolidated affiliates	(3)		(3)		(3)	(6)
Impairment losses on investments					(18)
Loss on debt extinguishment, net			0		0	0
Income from Continuing Operations Before Income Taxes	350		259		512	409
Income/(loss) from continuing operations	350		259		512	409
Income from discontinued operations, net of tax			0			0
Net Income			259			409
Net income attributable to NRG Energy, Inc.	350		259		512	409
East | Operating Segments
Segment Reporting Information
Operating revenues	566		524		1,105	1,133
Depreciation and amortization	33		30		66	56
Impairment losses			0			0
Reorganization costs			0		0	0
Gain on sale of assets			0		0	1
Equity in (losses)/earnings of unconsolidated affiliates	0		0		0	0
Impairment losses on investments					0
Loss on debt extinguishment, net			0		(1)	0
Income from Continuing Operations Before Income Taxes	146		60		170	159
Income/(loss) from continuing operations	146		60		170	159
Income from discontinued operations, net of tax			0			0
Net Income			60			159
Net income attributable to NRG Energy, Inc.	146		60		170	159
West/Other | Operating Segments
Segment Reporting Information
Operating revenues	94		106		219	199
Depreciation and amortization	8		7		16	18
Impairment losses			0			0
Reorganization costs			0		0	0
Gain on sale of assets			0		1	0
Equity in (losses)/earnings of unconsolidated affiliates	15		3		4	(15)
Impairment losses on investments					0
Loss on debt extinguishment, net			0		0	0
Income from Continuing Operations Before Income Taxes	26		18		67	(5)
Income/(loss) from continuing operations	25		18		66	(5)
Income from discontinued operations, net of tax			0			0
Net Income			18			(5)
Net income attributable to NRG Energy, Inc.	25		17		66	(6)
Corporate | Operating Segments
Segment Reporting Information
Operating revenues	0		1		0	0
Depreciation and amortization	10		8		19	16
Impairment losses			0			0
Reorganization costs			(1)		2	11
Gain on sale of assets			1		5	1
Equity in (losses)/earnings of unconsolidated affiliates	0		0		0	0
Impairment losses on investments					0
Loss on debt extinguishment, net			(47)		0	(47)
Income from Continuing Operations Before Income Taxes	(109)		(149)		(191)	(276)
Income/(loss) from continuing operations	(209)		(148)		(314)	(279)
Income from discontinued operations, net of tax			13			401
Net Income			(135)			122
Net income attributable to NRG Energy, Inc.	$ (209)		$ (135)		$ (314)	$ 122

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effective Tax Rate
Income from continuing operations before income taxes	$ 414	$ 188	$ 558	$ 286
Income tax expense/(benefit) from continuing operations	$ 101	$ (1)	$ 124	$ 3
Effective income tax rate	24.40%	(0.50%)	22.20%	1.00%
Uncertain Tax Benefits
Non-current tax liability for uncertain tax benefits	$ 18		$ 18
Uncertain tax benefits, penalties and interest accrued	$ 2		$ 2

Related Party Transactions - Sc

Related Party Transactions - Schedule of NRG's Material Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Revenue from related parties	$ 12	$ 9	$ 27	$ 21
Gladstone
Related Party Transaction [Line Items]
Revenue from related parties	0	1	1	1
Ivanpah
Related Party Transaction [Line Items]
Revenue from related parties	10	7	23	18
Midway-Sunset
Related Party Transaction [Line Items]
Revenue from related parties	$ 2	$ 1	$ 3	$ 2

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2020USD ($)case	Jun. 30, 2019facility
Sierra Club Et Al V. Midwest Generation LLC
Loss Contingencies
Number of facilities | facility		4
XOOM Energy Litigation
Loss Contingencies
Pending lawsuits | case	2
Lignite Contract With Texas Westmoreland Coal Co.
Loss Contingencies
Bond obligation | $	$ 99

Subsequent Events (Details)

Subsequent Events (Details) customer in Millions, $ in Millions	Jul. 24, 2020USD ($)statecustomer	Jul. 22, 2020USD ($)	Jun. 30, 2020USD ($)
Leased Assets, Powerton facility and Units 7 and 8 of the Joliet facility
Subsequent Event [Line Items]
Operating lease liabilities			$ 148
Subsequent Event | Powerton Facility And Units 7 And 8 Of The Joliet Facility
Subsequent Event [Line Items]
Payment for asset acquisition		$ 260
Subsequent Event | Direct Energy
Subsequent Event [Line Items]
Customers added (over) | customer	3
Cash paid to acquire business	$ 3,600
Proceeds from issuance of long-term debt	2,400
Proceeds from issuance or sale of equity	750
Line of Credit Facility, Increase (Decrease), Net	3,500
Termination fee due from acquiree for failure to obtain shareholder approval	30
Termination fee if Purchase Agreement terminated	$ 180
Subsequent Event | Direct Energy | U.S.
Subsequent Event [Line Items]
States in which entity operates | state	50
Subsequent Event | Direct Energy | Canada
Subsequent Event [Line Items]
Provinces in which entity operates | state	6

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt amount	$ 5,957	$ 6,042
Recourse Debt
Debt Instrument [Line Items]
Debt amount	5,925	$ 6,008
Senior Notes | Recourse Debt
Debt Instrument [Line Items]
Debt amount	4,400
Senior Secured First Lien Notes | Recourse Debt
Debt Instrument [Line Items]
Debt amount	$ 1,100

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF OPERATIONS (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues
Total operating revenues	$ 2,238		$ 2,465		$ 4,257	$ 4,630
Operating Costs and Expenses
Cost of operations	1,434		1,845		2,891	3,496
Depreciation and amortization	110		85		219	170
Impairment losses	0		1		0	1
Selling, general and administrative costs	208		211		417	405
Reorganization costs	0		2		3	15
Development costs	2		2		5	4
Total operating costs and expenses	1,754		2,146		3,535	4,091
Gain on sale of assets	0		1		6	2
Operating Income/(Loss)	484		320		728	541
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	0		0		0	0
Equity in earnings/(losses) of unconsolidated affiliates	12		0		1	(21)
Impairment losses on investments	0		0		(18)	0
Other income, net	14		20		41	32
Loss on debt extinguishment, net	0		(47)		(1)	(47)
Interest expense	(96)		(105)		(193)	(219)
Total other income/(expense)	(70)		(132)		(170)	(255)
Income from Continuing Operations Before Income Taxes	414		188		558	286
Income tax expense/(benefit)	101		(1)		124	3
Income from Continuing Operations	313		189		434	283
Income from discontinued operations, net of income tax	0		13		0	401
Net Income	313		202		434	684
Less: Net income attributable to redeemable noncontrolling interests	0		1		0	1
Net Income Attributable to NRG Energy, Inc.	313	$ 121	201	$ 482	434	683
Eliminations
Operating Revenues
Total operating revenues	2		(7)		(9)	(6)
Operating Costs and Expenses
Cost of operations	2		(7)		(9)	(6)
Depreciation and amortization	0		0		0	0
Impairment losses			0			0
Selling, general and administrative costs	0		0		0	0
Reorganization costs			0		0	0
Development costs	0		0		0	0
Total operating costs and expenses	2		(7)		(9)	(6)
Gain on sale of assets			0		0	0
Operating Income/(Loss)	0		0		0	0
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	(586)		(432)		(851)	(741)
Equity in earnings/(losses) of unconsolidated affiliates	0				0	0
Impairment losses on investments					0
Other income, net	0		0		0	0
Loss on debt extinguishment, net			0		0	0
Interest expense	0		0		0	0
Total other income/(expense)	(586)		(432)		(851)	(741)
Income from Continuing Operations Before Income Taxes	(586)		(432)		(851)	(741)
Income tax expense/(benefit)	0		0		0	0
Income from Continuing Operations			(432)			(741)
Income from discontinued operations, net of income tax			0			0
Net Income	(586)		(432)		(851)	(741)
Less: Net income attributable to redeemable noncontrolling interests			0			0
Net Income Attributable to NRG Energy, Inc.	(586)		(432)		(851)	(741)
Guarantor Subsidiaries
Operating Revenues
Total operating revenues	2,055		2,140		3,833	3,909
Operating Costs and Expenses
Cost of operations	1,271		1,590		2,561	2,948
Depreciation and amortization	80		51		160	105
Impairment losses			1			1
Selling, general and administrative costs	137		112		277	234
Reorganization costs			0		0	0
Development costs	0		0		0	0
Total operating costs and expenses	1,488		1,754		2,998	3,288
Gain on sale of assets			0		0	1
Operating Income/(Loss)	567		386		835	622
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	3		2		6	12
Equity in earnings/(losses) of unconsolidated affiliates	0				0	0
Impairment losses on investments					0
Other income, net	7		4		10	8
Loss on debt extinguishment, net			0		0	0
Interest expense	(4)		(3)		(9)	(7)
Total other income/(expense)	6		3		7	13
Income from Continuing Operations Before Income Taxes	573		389		842	635
Income tax expense/(benefit)	0		0		0	0
Income from Continuing Operations			389			635
Income from discontinued operations, net of income tax			0			9
Net Income	573		389		842	644
Less: Net income attributable to redeemable noncontrolling interests			0			0
Net Income Attributable to NRG Energy, Inc.	573		389		842	644
Non-Guarantor Subsidiaries
Operating Revenues
Total operating revenues	181		332		433	727
Operating Costs and Expenses
Cost of operations	154		252		356	535
Depreciation and amortization	20		26		39	49
Impairment losses			0			0
Selling, general and administrative costs	7		12		12	28
Reorganization costs			0		0	0
Development costs	1		1		1	1
Total operating costs and expenses	182		291		408	613
Gain on sale of assets			1		1	1
Operating Income/(Loss)	(1)		42		26	115
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	0		0		0	0
Equity in earnings/(losses) of unconsolidated affiliates	12				1	(21)
Impairment losses on investments					(18)
Other income, net	5		8		4	9
Loss on debt extinguishment, net			0		0	0
Interest expense	(2)		(5)		(3)	(9)
Total other income/(expense)	15		3		(16)	(21)
Income from Continuing Operations Before Income Taxes	14		45		10	94
Income tax expense/(benefit)	1		1		1	1
Income from Continuing Operations			44			93
Income from discontinued operations, net of income tax			0			5
Net Income	13		44		9	98
Less: Net income attributable to redeemable noncontrolling interests			1			1
Net Income Attributable to NRG Energy, Inc.	13		43		9	97
NRG Energy, Inc. (Note Issuer)
Operating Revenues
Total operating revenues	0		0		0	0
Operating Costs and Expenses
Cost of operations	7		10		(17)	19
Depreciation and amortization	10		8		20	16
Impairment losses			0			0
Selling, general and administrative costs	64		87		128	143
Reorganization costs			2		3	15
Development costs	1		1		4	3
Total operating costs and expenses	82		108		138	196
Gain on sale of assets			0		5	0
Operating Income/(Loss)	(82)		(108)		(133)	(196)
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	583		430		845	729
Equity in earnings/(losses) of unconsolidated affiliates	0				0	0
Impairment losses on investments					0
Other income, net	2		8		27	15
Loss on debt extinguishment, net			(47)		(1)	(47)
Interest expense	(90)		(97)		(181)	(203)
Total other income/(expense)	495		294		690	494
Income from Continuing Operations Before Income Taxes	413		186		557	298
Income tax expense/(benefit)	100		(2)		123	2
Income from Continuing Operations			188			296
Income from discontinued operations, net of income tax			13			387
Net Income	313		201		434	683
Less: Net income attributable to redeemable noncontrolling interests			0			0
Net Income Attributable to NRG Energy, Inc.	$ 313		$ 201		$ 434	$ 683

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 313		$ 202		$ 434	$ 684
Other Comprehensive Income
Foreign currency translation adjustments, net	13		(1)		(2)	0
Available-for-sale securities	0		1		0	1
Defined benefit plans, net	0		(3)		0	(6)
Other comprehensive (loss) income, net of tax	13	$ (15)	(3)	$ (2)	(2)	(5)
Comprehensive Income	326		199		432	679
Less: Comprehensive income attributable to redeemable noncontrolling interest	0		1		0	1
Comprehensive Income Attributable to NRG Energy, Inc.	326		198		432	678
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Income	(586)		(432)		(851)	(741)
Other Comprehensive Income
Foreign currency translation adjustments, net	(25)		2		5
Available-for-sale securities			0			0
Defined benefit plans, net	(1)		0		(3)	0
Other comprehensive (loss) income, net of tax	(26)		2		2	0
Comprehensive Income			(430)			(741)
Less: Comprehensive income attributable to redeemable noncontrolling interest			0			0
Comprehensive Income Attributable to NRG Energy, Inc.	(612)		(430)		(849)	(741)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	573		389		842	644
Other Comprehensive Income
Foreign currency translation adjustments, net	12		(1)		(3)
Available-for-sale securities			0			0
Defined benefit plans, net	1		0		3	0
Other comprehensive (loss) income, net of tax	13		(1)		0	0
Comprehensive Income			388			644
Less: Comprehensive income attributable to redeemable noncontrolling interest			0			0
Comprehensive Income Attributable to NRG Energy, Inc.	586		388		842	644
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	13		44		9	98
Other Comprehensive Income
Foreign currency translation adjustments, net	13		(1)		(2)
Available-for-sale securities			0			0
Defined benefit plans, net	0		0		0	0
Other comprehensive (loss) income, net of tax	13		(1)		(2)	0
Comprehensive Income			43			98
Less: Comprehensive income attributable to redeemable noncontrolling interest			1			1
Comprehensive Income Attributable to NRG Energy, Inc.	26		42		7	97
NRG Energy, Inc. (Note Issuer)
Condensed Financial Statements, Captions [Line Items]
Net Income	313		201		434	683
Other Comprehensive Income
Foreign currency translation adjustments, net	13		(1)		(2)
Available-for-sale securities			1			1
Defined benefit plans, net	0		(3)		0	(6)
Other comprehensive (loss) income, net of tax	13		(3)		(2)	(5)
Comprehensive Income			198			678
Less: Comprehensive income attributable to redeemable noncontrolling interest			0			0
Comprehensive Income Attributable to NRG Energy, Inc.	$ 326		$ 198		$ 432	$ 678

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - CONSOLIDATING BALANCE SHEETS (Details) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 418		$ 345
Funds deposited by counterparties	36		32
Restricted cash	8		8
Accounts receivable, net	1,015		1,025
Inventory	388		383
Derivative instruments	791		860
Cash collateral paid in support of energy risk management activities	136		190
Prepayments and other current assets	284		245
Total current assets	3,076		3,088
Property, plant and equipment, net	2,533		2,593
Other Assets
Investment in subsidiaries	0		0
Equity investments in affiliates	372		388
Operating lease right-of-use assets, net	429		464
Goodwill	579		579
Intangible assets, net	733		789
Nuclear decommissioning trust fund	794		794
Derivative instruments	439		310
Deferred income taxes	3,170		3,286
Other non-current assets	212		240
Total other assets	6,728		6,850
Total Assets	12,337		12,531
Current Liabilities
Current portion of long-term debt	7		88
Current portion of operating lease liabilities	69		73
Accounts payable	736		722
Derivative instruments	728		781
Cash collateral received in support of energy risk management activities	36		32
Accrued expenses and other current liabilities	581		663
Total current liabilities	2,157		2,359
Other Liabilities
Long-term debt	5,810		5,803
Non-current operating lease liabilities	458		483
Nuclear decommissioning reserve	307		298
Nuclear decommissioning trust liability	478		487
Derivative instruments	299		322
Deferred income taxes	17		17
Other non-current liabilities	1,061		1,084
Total other liabilities	8,430		8,494
Total Liabilities	10,587		10,853
Redeemable noncontrolling interest in subsidiaries	0		20
Total Stockholders' Equity	1,750	$ 1,536	1,658	$ (1,648)	$ (1,538)	$ (1,234)
Total Liabilities and Stockholders' Equity	12,337		12,531
Eliminations
Current Assets
Cash and cash equivalents	0		0
Funds deposited by counterparties	0		0
Restricted cash	0		0
Accounts receivable, net	(1,350)		(740)
Inventory	0		0
Derivative instruments	(20)		(41)
Cash collateral paid in support of energy risk management activities	0		0
Prepayments and other current assets	0		0
Total current assets	(1,370)		(781)
Property, plant and equipment, net	0		0
Other Assets
Investment in subsidiaries	(4,695)		(5,495)
Equity investments in affiliates	0		0
Operating lease right-of-use assets, net	0		0
Goodwill	0		0
Intangible assets, net	0		0
Nuclear decommissioning trust fund	0		0
Derivative instruments	(9)		(13)
Deferred income taxes	0		0
Other non-current assets	0		0
Total other assets	(4,704)		(5,508)
Total Assets	(6,074)		(6,289)
Current Liabilities
Current portion of long-term debt	0		0
Current portion of operating lease liabilities	0		0
Accounts payable	(1,350)		(740)
Derivative instruments	(20)		(41)
Cash collateral received in support of energy risk management activities	0		0
Accrued expenses and other current liabilities	0		0
Total current liabilities	(1,370)		(781)
Other Liabilities
Long-term debt	0		0
Non-current operating lease liabilities	0		0
Nuclear decommissioning reserve	0		0
Nuclear decommissioning trust liability	0		0
Derivative instruments	(9)		(13)
Deferred income taxes	0		0
Other non-current liabilities	0		0
Total other liabilities	(9)		(13)
Total Liabilities	(1,379)		(794)
Redeemable noncontrolling interest in subsidiaries			0
Total Stockholders' Equity	(4,695)		(5,495)
Total Liabilities and Stockholders' Equity	(6,074)		(6,289)
Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	0		0
Funds deposited by counterparties	36		32
Restricted cash	7		5
Accounts receivable, net	987		1,293
Inventory	306		272
Derivative instruments	789		856
Cash collateral paid in support of energy risk management activities	133		182
Prepayments and other current assets	247		170
Total current assets	2,505		2,810
Property, plant and equipment, net	1,336		1,483
Other Assets
Investment in subsidiaries	170		710
Equity investments in affiliates	0		0
Operating lease right-of-use assets, net	73		81
Goodwill	400		359
Intangible assets, net	695		375
Nuclear decommissioning trust fund	794		794
Derivative instruments	439		308
Deferred income taxes	435		421
Other non-current assets	150		145
Total other assets	3,156		3,193
Total Assets	6,997		7,486
Current Liabilities
Current portion of long-term debt	3		0
Current portion of operating lease liabilities	19		20
Accounts payable	809		918
Derivative instruments	739		797
Cash collateral received in support of energy risk management activities	36		32
Accrued expenses and other current liabilities	296		280
Total current liabilities	1,902		2,047
Other Liabilities
Long-term debt	245		302
Non-current operating lease liabilities	58		64
Nuclear decommissioning reserve	307		298
Nuclear decommissioning trust liability	478		487
Derivative instruments	307		334
Deferred income taxes	0		0
Other non-current liabilities	421		399
Total other liabilities	1,816		1,884
Total Liabilities	3,718		3,931
Redeemable noncontrolling interest in subsidiaries			0
Total Stockholders' Equity	3,279		3,555
Total Liabilities and Stockholders' Equity	6,997		7,486
Non-Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	20		20
Funds deposited by counterparties	0		0
Restricted cash	0		1
Accounts receivable, net	111		239
Inventory	82		111
Derivative instruments	22		45
Cash collateral paid in support of energy risk management activities	3		8
Prepayments and other current assets	10		8
Total current assets	248		432
Property, plant and equipment, net	1,046		952
Other Assets
Investment in subsidiaries	0		0
Equity investments in affiliates	372		388
Operating lease right-of-use assets, net	244		261
Goodwill	179		220
Intangible assets, net	38		414
Nuclear decommissioning trust fund	0		0
Derivative instruments	9		15
Deferred income taxes	(33)		(19)
Other non-current assets	27		30
Total other assets	836		1,309
Total Assets	2,130		2,693
Current Liabilities
Current portion of long-term debt	4		5
Current portion of operating lease liabilities	31		32
Accounts payable	187		141
Derivative instruments	9		25
Cash collateral received in support of energy risk management activities	0		0
Accrued expenses and other current liabilities	31		44
Total current liabilities	262		247
Other Liabilities
Long-term debt	24		28
Non-current operating lease liabilities	290		301
Nuclear decommissioning reserve	0		0
Nuclear decommissioning trust liability	0		0
Derivative instruments	1		1
Deferred income taxes	17		17
Other non-current liabilities	120		153
Total other liabilities	452		500
Total Liabilities	714		747
Redeemable noncontrolling interest in subsidiaries			20
Total Stockholders' Equity	1,416		1,926
Total Liabilities and Stockholders' Equity	2,130		2,693
NRG Energy, Inc. (Note Issuer)
Current Assets
Cash and cash equivalents	398		325
Funds deposited by counterparties	0		0
Restricted cash	1		2
Accounts receivable, net	1,267		233
Inventory	0		0
Derivative instruments	0		0
Cash collateral paid in support of energy risk management activities	0		0
Prepayments and other current assets	27		67
Total current assets	1,693		627
Property, plant and equipment, net	151		158
Other Assets
Investment in subsidiaries	4,525		4,785
Equity investments in affiliates	0		0
Operating lease right-of-use assets, net	112		122
Goodwill	0		0
Intangible assets, net	0		0
Nuclear decommissioning trust fund	0		0
Derivative instruments	0		0
Deferred income taxes	2,768		2,884
Other non-current assets	35		65
Total other assets	7,440		7,856
Total Assets	9,284		8,641
Current Liabilities
Current portion of long-term debt	0		83
Current portion of operating lease liabilities	19		21
Accounts payable	1,090		403
Derivative instruments	0		0
Cash collateral received in support of energy risk management activities	0		0
Accrued expenses and other current liabilities	254		339
Total current liabilities	1,363		846
Other Liabilities
Long-term debt	5,541		5,473
Non-current operating lease liabilities	110		118
Nuclear decommissioning reserve	0		0
Nuclear decommissioning trust liability	0		0
Derivative instruments	0		0
Deferred income taxes	0		0
Other non-current liabilities	520		532
Total other liabilities	6,171		6,123
Total Liabilities	7,534		6,969
Redeemable noncontrolling interest in subsidiaries			0
Total Stockholders' Equity	1,750		1,672
Total Liabilities and Stockholders' Equity	$ 9,284		$ 8,641

Condensed Consolidating Finan_7

Condensed Consolidating Financial Information - CONSOLIDATING STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities
Net income attributable to NRG Energy, Inc.	$ 313	$ 121	$ 201	$ 482	$ 434	$ 683
Net Income	313		202		434	684
Income from discontinued operations	0		13		0	401
Income from continuing operations	313		189		434	283
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates					7	22
Depreciation and amortization					219	170
Accretion of asset retirement obligations					18	14
Provision for credit losses	24				48	52
Amortization of nuclear fuel					25	27
Amortization of financing costs and debt discount/premiums					12	13
Loss on debt extinguishment, net					1	47
Amortization of emissions allowances and energy credits					33	14
Amortization of unearned equity compensation					12	10
Net loss on sale of assets and disposal of assets					(15)	1
Impairment losses					18	1
Changes in derivative instruments					(131)	(22)
Changes in deferred income taxes and liability for uncertain tax benefits					116	(5)
Changes in collateral deposits in support of energy risk management activities					58	125
Changes in nuclear decommissioning trust liability					36	17
Changes in other working capital					(199)	(352)
Cash provided by continuing operations					692	417
Cash provided by discontinued operations					0	8
Net Cash Provided/(Used) by Operating Activities					692	425
Cash Flows from Investing Activities
Intercompany dividends					0	0
Payments for acquisitions of businesses					(5)	(21)
Capital expenditures					(116)	(107)
Net purchases of /proceeds from emission allowances					(4)	(1)
Investments in nuclear decommissioning trust fund securities					(257)	(209)
Proceeds from the sale of nuclear decommissioning trust fund securities					220	191
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees					15	1,289
Net distributions from investments in unconsolidated affiliates					2	7
Contributions to discontinued operations					0	(44)
Cash (used)/provided by continuing operations					(145)	1,105
Cash provided by (Used) discontinued operations					0	(2)
Net Cash (Used)/Provided by Investing Activities					(145)	1,103
Cash Flows from Financing Activities
Intercompany dividends and transfers					0	0
Payments of dividends to common stockholders					(148)	(16)
Payments for share repurchase activity					(229)	(1,075)
Payments for debt extinguishment costs					0	(24)
Purchase of and distributions to noncontrolling interests from subsidiaries					(2)	(1)
Proceeds from issuance of common stock					1	2
Proceeds from issuance of long-term debt					59	1,833
Payment of debt issuance costs					(1)	(33)
Repayments of long-term debt					(61)	(2,485)
Net repayment of Revolving Credit Facility					(83)	0
Other					(5)	0
Cash used by continuing operations					(469)	(1,799)
Cash provided by discontinued operations					0	43
Net Cash Used by Financing Activities					(469)	(1,756)
Effect of exchange rate changes on cash and cash equivalents					(1)	0
Change in Cash from discontinued operations					0	49
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash					77	(277)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		385		613	385	613
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	462		336		462	336
Eliminations
Cash Flows from Operating Activities
Net income attributable to NRG Energy, Inc.	(586)		(432)		(851)	(741)
Net Income	(586)		(432)		(851)	(741)
Income from discontinued operations			0			0
Income from continuing operations			(432)			(741)
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates					851	741
Depreciation and amortization					0	0
Accretion of asset retirement obligations					0	0
Provision for credit losses					0	0
Amortization of nuclear fuel					0	0
Amortization of financing costs and debt discount/premiums					0	0
Loss on debt extinguishment, net					0	0
Amortization of emissions allowances and energy credits					0	0
Amortization of unearned equity compensation					0	0
Net loss on sale of assets and disposal of assets					0	0
Impairment losses					0	0
Changes in derivative instruments					0	0
Changes in deferred income taxes and liability for uncertain tax benefits					0	0
Changes in collateral deposits in support of energy risk management activities					0	0
Changes in nuclear decommissioning trust liability					0	0
Changes in other working capital					0	0
Cash provided by continuing operations						0
Cash provided by discontinued operations						0
Net Cash Provided/(Used) by Operating Activities					0	0
Cash Flows from Investing Activities
Intercompany dividends					(1,889)	(2,209)
Payments for acquisitions of businesses					0	0
Capital expenditures					0	0
Net purchases of /proceeds from emission allowances					0	0
Investments in nuclear decommissioning trust fund securities					0	0
Proceeds from the sale of nuclear decommissioning trust fund securities					0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees					0	0
Net distributions from investments in unconsolidated affiliates					0	0
Contributions to discontinued operations						0
Cash (used)/provided by continuing operations						(2,209)
Cash provided by (Used) discontinued operations						0
Net Cash (Used)/Provided by Investing Activities					(1,889)	(2,209)
Cash Flows from Financing Activities
Intercompany dividends and transfers					1,889	2,209
Payments of dividends to common stockholders					0	0
Payments for share repurchase activity					0	0
Payments for debt extinguishment costs						0
Purchase of and distributions to noncontrolling interests from subsidiaries					0	0
Proceeds from issuance of common stock					0	0
Proceeds from issuance of long-term debt					0	0
Payment of debt issuance costs					0	0
Repayments of long-term debt					0	0
Net repayment of Revolving Credit Facility					0
Other					0
Cash used by continuing operations						2,209
Cash provided by discontinued operations						0
Net Cash Used by Financing Activities					1,889	2,209
Effect of exchange rate changes on cash and cash equivalents					0
Change in Cash from discontinued operations						0
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash					0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		0		0	0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	0		0		0	0
Guarantor Subsidiaries
Cash Flows from Operating Activities
Net income attributable to NRG Energy, Inc.	573		389		842	644
Net Income	573		389		842	644
Income from discontinued operations			0			9
Income from continuing operations			389			635
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates					(6)	(12)
Depreciation and amortization					160	104
Accretion of asset retirement obligations					10	11
Provision for credit losses					47	42
Amortization of nuclear fuel					25	27
Amortization of financing costs and debt discount/premiums					0	0
Loss on debt extinguishment, net					0	0
Amortization of emissions allowances and energy credits					24	13
Amortization of unearned equity compensation					0	0
Net loss on sale of assets and disposal of assets					(9)	(3)
Impairment losses					0	1
Changes in derivative instruments					(144)	(28)
Changes in deferred income taxes and liability for uncertain tax benefits					1,212	0
Changes in collateral deposits in support of energy risk management activities					53	128
Changes in nuclear decommissioning trust liability					36	17
Changes in other working capital					(124)	(343)
Cash provided by continuing operations						592
Cash provided by discontinued operations						17
Net Cash Provided/(Used) by Operating Activities					2,126	609
Cash Flows from Investing Activities
Intercompany dividends					0	0
Payments for acquisitions of businesses					(5)	(21)
Capital expenditures					(78)	(77)
Net purchases of /proceeds from emission allowances					(4)	(1)
Investments in nuclear decommissioning trust fund securities					(257)	(209)
Proceeds from the sale of nuclear decommissioning trust fund securities					220	191
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees					10	1
Net distributions from investments in unconsolidated affiliates					0	0
Contributions to discontinued operations						0
Cash (used)/provided by continuing operations						(116)
Cash provided by (Used) discontinued operations						0
Net Cash (Used)/Provided by Investing Activities					(114)	(116)
Cash Flows from Financing Activities
Intercompany dividends and transfers					(1,941)	(532)
Payments of dividends to common stockholders					0	0
Payments for share repurchase activity					0	0
Payments for debt extinguishment costs						0
Purchase of and distributions to noncontrolling interests from subsidiaries					0	0
Proceeds from issuance of common stock					0	0
Proceeds from issuance of long-term debt					0	0
Payment of debt issuance costs					0	0
Repayments of long-term debt					(60)	0
Net repayment of Revolving Credit Facility					0
Other					(5)
Cash used by continuing operations						(532)
Cash provided by discontinued operations						0
Net Cash Used by Financing Activities					(2,006)	(532)
Effect of exchange rate changes on cash and cash equivalents					0
Change in Cash from discontinued operations						17
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash					6	(56)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		37		95	37	95
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	43		39		43	39
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities
Net income attributable to NRG Energy, Inc.	13		43		9	97
Net Income	13		44		9	98
Income from discontinued operations			0			5
Income from continuing operations			44			93
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates					7	22
Depreciation and amortization					39	50
Accretion of asset retirement obligations					8	3
Provision for credit losses					1	4
Amortization of nuclear fuel					0	0
Amortization of financing costs and debt discount/premiums					0	0
Loss on debt extinguishment, net					0	0
Amortization of emissions allowances and energy credits					9	1
Amortization of unearned equity compensation					0	0
Net loss on sale of assets and disposal of assets					(1)	1
Impairment losses					18	0
Changes in derivative instruments					13	(32)
Changes in deferred income taxes and liability for uncertain tax benefits					(154)	(3)
Changes in collateral deposits in support of energy risk management activities					5	(3)
Changes in nuclear decommissioning trust liability					0	0
Changes in other working capital					(19)	(64)
Cash provided by continuing operations						72
Cash provided by discontinued operations						(9)
Net Cash Provided/(Used) by Operating Activities					(65)	63
Cash Flows from Investing Activities
Intercompany dividends					0	0
Payments for acquisitions of businesses					0	0
Capital expenditures					(20)	(15)
Net purchases of /proceeds from emission allowances					0	0
Investments in nuclear decommissioning trust fund securities					0	0
Proceeds from the sale of nuclear decommissioning trust fund securities					0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees					0	400
Net distributions from investments in unconsolidated affiliates					2	7
Contributions to discontinued operations						(44)
Cash (used)/provided by continuing operations						348
Cash provided by (Used) discontinued operations						(2)
Net Cash (Used)/Provided by Investing Activities					(18)	346
Cash Flows from Financing Activities
Intercompany dividends and transfers					86	(375)
Payments of dividends to common stockholders					0	0
Payments for share repurchase activity					0	0
Payments for debt extinguishment costs						0
Purchase of and distributions to noncontrolling interests from subsidiaries					(2)	(1)
Proceeds from issuance of common stock					0	0
Proceeds from issuance of long-term debt					0	0
Payment of debt issuance costs					0	0
Repayments of long-term debt					(1)	(53)
Net repayment of Revolving Credit Facility					0
Other					0
Cash used by continuing operations						(429)
Cash provided by discontinued operations						43
Net Cash Used by Financing Activities					83	(386)
Effect of exchange rate changes on cash and cash equivalents					(1)
Change in Cash from discontinued operations						32
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash					(1)	(9)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		21		38	21	38
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	20		29		20	29
NRG Energy, Inc. (Note Issuer)
Cash Flows from Operating Activities
Net income attributable to NRG Energy, Inc.	313		201		434	683
Net Income	313		201		434	683
Income from discontinued operations			13			387
Income from continuing operations			188			296
Adjustments to reconcile net income/(loss) to cash provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates					(845)	(729)
Depreciation and amortization					20	16
Accretion of asset retirement obligations					0	0
Provision for credit losses					0	6
Amortization of nuclear fuel					0	0
Amortization of financing costs and debt discount/premiums					12	13
Loss on debt extinguishment, net					1	47
Amortization of emissions allowances and energy credits					0	0
Amortization of unearned equity compensation					12	10
Net loss on sale of assets and disposal of assets					(5)	3
Impairment losses					0	0
Changes in derivative instruments					0	38
Changes in deferred income taxes and liability for uncertain tax benefits					(942)	(2)
Changes in collateral deposits in support of energy risk management activities					0	0
Changes in nuclear decommissioning trust liability					0	0
Changes in other working capital					(56)	55
Cash provided by continuing operations						(247)
Cash provided by discontinued operations						0
Net Cash Provided/(Used) by Operating Activities					(1,369)	(247)
Cash Flows from Investing Activities
Intercompany dividends					1,889	2,209
Payments for acquisitions of businesses					0	0
Capital expenditures					(18)	(15)
Net purchases of /proceeds from emission allowances					0	0
Investments in nuclear decommissioning trust fund securities					0	0
Proceeds from the sale of nuclear decommissioning trust fund securities					0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees					5	888
Net distributions from investments in unconsolidated affiliates					0	0
Contributions to discontinued operations						0
Cash (used)/provided by continuing operations						3,082
Cash provided by (Used) discontinued operations						0
Net Cash (Used)/Provided by Investing Activities					1,876	3,082
Cash Flows from Financing Activities
Intercompany dividends and transfers					(34)	(1,302)
Payments of dividends to common stockholders					(148)	(16)
Payments for share repurchase activity					(229)	(1,075)
Payments for debt extinguishment costs						(24)
Purchase of and distributions to noncontrolling interests from subsidiaries					0	0
Proceeds from issuance of common stock					1	2
Proceeds from issuance of long-term debt					59	1,833
Payment of debt issuance costs					(1)	(33)
Repayments of long-term debt					0	(2,432)
Net repayment of Revolving Credit Facility					(83)
Other					0
Cash used by continuing operations						(3,047)
Cash provided by discontinued operations						0
Net Cash Used by Financing Activities					(435)	(3,047)
Effect of exchange rate changes on cash and cash equivalents					0
Change in Cash from discontinued operations						0
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash					72	(212)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		$ 327		$ 480	327	480
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 399		$ 268		$ 399	$ 268