NRG Energy (NRG) 10-Q 8 Aug 23 2023 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2023	Jul. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
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	910 Louisiana Street
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	537-3000
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		229,117,430
Entity Central Index Key	0001013871
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Revenue	$ 6,348	$ 7,282	$ 14,070	$ 15,178
Operating Costs and Expenses
Cost of operations (excluding depreciation and amortization shown below)	4,962	5,887	13,740	10,817
Depreciation and amortization	315	157	505	340
Impairment losses	0	155	0	155
Selling, general and administrative costs	522	351	948	698
Acquisition-related transaction and integration costs	22	10	93	18
Total operating costs and expenses	5,821	6,560	15,286	12,028
Gain on sale of assets	3	32	202	29
Operating Income/(Loss)	530	754	(1,014)	3,179
Other Income/(Expense)
Equity in earnings/(losses) of unconsolidated affiliates	5	4	10	(11)
Other income, net	13	12	29	12
Interest expense	(151)	(105)	(299)	(208)
Total other expense	(133)	(89)	(260)	(207)
Income/(Loss) Before Income Taxes	397	665	(1,274)	2,972
Income tax expense/(benefit)	89	152	(247)	723
Net Income/(Loss)	308	513	(1,027)	2,249
Less: Cumulative dividends attributable to Series A Preferred Stock	17	0	21	0
Net Income/(Loss) Available to Common Stockholders, basic	291	513	(1,048)	2,249
Net Income/(Loss) Available to Common Stockholders, diluted	$ 291	$ 513	$ (1,048)	$ 2,249
Income/(Loss) per Share
Weighted average number of common shares outstanding — basic (in shares)	231,000	237,000	230,000	240,000
Weighted average number of common shares outstanding — diluted (in shares)	232,000	237,000	230,000	240,000
Income/(Loss) per Weighted Average Common Share — Basic (in usd per share)	$ 1.26	$ 2.16	$ (4.56)	$ 9.37
Income/(Loss) per Weighted Average Common Share — Diluted (in usd per share)	$ 1.25	$ 2.16	$ (4.56)	$ 9.37

ONDENSED CONSOLIDATED STATEMENT

ONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income/(Loss)	$ 308	$ 513	$ (1,027)	$ 2,249
Other Comprehensive Income/(Loss)
Foreign currency translation adjustments	6	(22)	8	(13)
Defined benefit plans	0	20	(1)	19
Other comprehensive income/(loss)	6	(2)	7	6
Comprehensive Income/(Loss)	$ 314	$ 511	$ (1,020)	$ 2,255

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 422	$ 430
Funds deposited by counterparties	365	1,708
Restricted cash	26	40
Accounts receivable, net	3,274	4,773
Inventory	686	751
Derivative instruments	4,423	7,886
Cash collateral paid in support of energy risk management activities	270	260
Prepayments and other current assets	580	383
Current assets - held-for-sale	75	0
Total current assets	10,121	16,231
Property, plant and equipment, net	1,706	1,692
Other Assets
Equity investments in affiliates	139	133
Operating lease right-of-use assets, net	221	225
Goodwill	5,143	1,650
Nuclear decommissioning trust fund	0	838
Derivative instruments	2,910	4,108
Deferred income taxes	2,711	1,881
Other non-current assets	536	251
Non-current assets - held-for-sale	1,161	5
Total other assets	17,164	11,223
Total Assets	28,991	29,146
Current Liabilities
Current portion of long-term debt and finance leases	1,319	63
Current portion of operating lease liabilities	91	83
Accounts payable	2,107	3,643
Derivative instruments	3,832	6,195
Cash collateral received in support of energy risk management activities	365	1,708
Deferred revenue current	731	176
Accrued expenses and other current liabilities	1,395	1,110
Current liabilities - held-for-sale	36	4
Total current liabilities	9,876	12,982
Other Liabilities
Long-term debt and finance leases	10,737	7,976
Non-current operating lease liabilities	165	180
Nuclear decommissioning reserve	0	340
Nuclear decommissioning trust liability	0	477
Derivative instruments	1,889	2,246
Deferred income taxes	130	134
Deferred revenue non-current	927	10
Other non-current liabilities	988	942
Non-current liabilities - held-for-sale	947	31
Total other liabilities	15,783	12,336
Total Liabilities	25,659	25,318
Commitments and Contingencies
Stockholders' Equity
Preferred stock; 10,000,000 shares authorized; 650,000 Series A shares issued and outstanding at June 30, 2023 (liquidation preference $1,000); 0 shares issued and outstanding at December 31, 2022	650	0
Common stock; $0.01 par value; 500,000,000 shares authorized; 424,675,214 and 423,897,001 shares issued and 230,425,759 and 229,561,030 shares outstanding at June 30, 2023 and December 31, 2022, respectively	4	4
Additional paid-in-capital	8,504	8,457
Retained earnings	205	1,408
Treasury stock, at cost 194,249,455 and 194,335,971 shares at June 30, 2023 and December 31, 2022, respectively	(5,861)	(5,864)
Accumulated other comprehensive loss	(170)	(177)
Total Stockholders' Equity	3,332	3,828
Total Liabilities and Stockholders' Equity	$ 28,991	$ 29,146
Treasury stock, shares (in shares)	194,249,455	194,335,971
Customer relationships, net
Other Assets
Intangible assets, net	$ 2,446	$ 943
Other intangible assets, net
Other Assets
Intangible assets, net	$ 1,897	$ 1,189

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	650,000	0
Preferred stock, shares outstanding (in shares)	650,000	0
Preferred stock, liquidation preference	$ 1,000
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)	424,675,214	423,897,001
Common stock, shares outstanding (in shares)	230,425,759	229,561,030
Treasury stock, shares (in shares)	194,249,455	194,335,971

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Cash Flows from Operating Activities
Net (Loss)/Income		$ (1,027)	$ 2,249
Adjustments to reconcile net (loss)/income to cash (used)/provided by operating activities:
Distributions from and equity in (earnings)/losses of unconsolidated affiliates		(9)	16
Depreciation and amortization		505	340
Accretion of asset retirement obligations		5	16
Provision for credit losses		80	51
Amortization of nuclear fuel		26	28
Amortization of financing costs and debt discounts		31	11
Amortization of in-the-money contracts and emissions allowances		112	128
Amortization of unearned equity compensation		61	14
Net gain on sale of assets and disposal of assets		(187)	(46)
Impairment losses		0	155
Changes in derivative instruments		1,515	(3,918)
Changes in current and deferred income taxes and liability for uncertain tax benefits		(282)	672
Changes in collateral deposits in support of risk management activities		(1,355)	3,121
Changes in nuclear decommissioning trust liability		2	(5)
Uplift securitization proceeds received from ERCOT		0	689
Changes in other working capital		(505)	(332)
Cash (used)/provided by operating activities		(1,028)	3,189
Cash Flows from Investing Activities
Payments for acquisitions of businesses and assets, net of cash acquired		(2,498)	(53)
Capital expenditures		(324)	(150)
Net purchases of emission allowances		(25)	(19)
Investments in nuclear decommissioning trust fund securities		(185)	(271)
Proceeds from the sale of nuclear decommissioning trust fund securities		180	278
Proceeds from sales of assets, net of cash disposed		229	96
Proceeds from insurance recoveries for property, plant and equipment, net		121	0
Cash used by investing activities		(2,502)	(119)
Cash Flows from Financing Activities
Proceeds from issuance of preferred stock, net of fees		635	0
Payments of dividends to common stockholders		(174)	(168)
Payments for share repurchase activity	[1]	(16)	(366)
Net receipts from settlement of acquired derivatives that include financing elements		318	950
Net proceeds of Revolving Credit Facility		700	0
Proceeds from issuance of long-term debt		731	0
Payments of debt issuance costs		(22)	0
Repayments of long-term debt and finance leases		(10)	(2)
Cash provided by financing activities		2,162	414
Effect of exchange rate changes on cash and cash equivalents		3	0
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash		(1,365)	3,484
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period		2,178	1,110
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period		$ 813	$ 4,594
[1]ncludes $(16) million and $(6) million of equivalent shares purchased in lieu of tax withholdings on equity compensation issuances during the six months ended June 30, 2023 and June 30, 2022, respectively

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Cash Flows [Abstract]
Tax withholding on equity awards	$ (16)	$ (6)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2021		$ 3,600	$ (43)		$ 4	$ 8,531	$ (100)	$ 464	$ 57	$ (5,273)	$ (126)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		1,736						1,736
Other comprehensive income/(loss)		8									8
Share repurchases		(187)								(187)
Equity-based awards activity, net	[1]	2				2
Common stock dividends and dividend equivalents declared	[2]	(86)						(86)
Ending balance at Mar. 31, 2022		5,030			4	8,433		2,171		(5,460)	(118)
Beginning balance at Dec. 31, 2021		3,600	$ (43)		4	8,531	$ (100)	464	$ 57	(5,273)	(126)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		2,249
Other comprehensive income/(loss)		6
Ending balance at Jun. 30, 2022		5,300			4	8,442		2,600		(5,626)	(120)
Beginning balance at Mar. 31, 2022		5,030			4	8,433		2,171		(5,460)	(118)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		513						513
Other comprehensive income/(loss)		(2)									(2)
Shares reissuance for ESPP		3				1				2
Share repurchases		(168)								(168)
Equity-based awards activity, net		8				8
Common stock dividends and dividend equivalents declared	[2]	(84)						(84)
Ending balance at Jun. 30, 2022		5,300			4	8,442		2,600		(5,626)	(120)
Beginning balance at Dec. 31, 2022		3,828		$ 0	4	8,457		1,408		(5,864)	(177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		(1,335)						(1,335)
Issuance of Series A Preferred Stock		636		650		(14)
Other comprehensive income/(loss)		1									1
Equity-based awards activity, net	[1]	38				38
Common stock dividends and dividend equivalents declared	[2]	(88)						(88)
Ending balance at Mar. 31, 2023		3,080		650	4	8,481		(15)		(5,864)	(176)
Beginning balance at Dec. 31, 2022		3,828		0	4	8,457		1,408		(5,864)	(177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		(1,027)
Other comprehensive income/(loss)		7
Ending balance at Jun. 30, 2023		3,332		650	4	8,504		205		(5,861)	(170)
Beginning balance at Mar. 31, 2023		3,080		650	4	8,481		(15)		(5,864)	(176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)		308						308
Other comprehensive income/(loss)		6									6
Shares reissuance for ESPP		4				1				3
Equity-based awards activity, net	[1]	23				23
Common stock dividends and dividend equivalents declared	[2]	(88)						(88)
Ending balance at Jun. 30, 2023		$ 3,332		$ 650	$ 4	$ 8,504		$ 205		$ (5,861)	$ (170)
[1]Includes $(8) million, $(8) million and $(6) million of equivalent shares purchased in lieu of tax withholding on equity compensation issuances for the quarters ended March 31, 2023, June 30, 2023 and March 31, 2022, respectively[2]Dividends per common share were $0.3775 for the quarters ended June 30 and March 31, 2023 and $0.35 for the quarters ended June 30 and March 31, 2022

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares shares in Thousands	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Shares purchased for tax withholding obligation (in shares)	(8,000)	(8,000)	(6,000)
Dividends per common share (in usd per share)	$ 0.3775	$ 0.3775	$ 0.35

Nature of Business and Basis of

Nature of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2023
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 a leading energy, smart home and services company fueled by market-leading brands, proprietary technologies, and complementary sales channels. Across the United States and Canada, NRG delivers innovative, sustainable solutions, predominately under brand names such as NRG, Reliant, Direct Energy, Green Mountain Energy and Vivint, while also advocating for competitive energy markets and customer choice. The Company has a customer base that includes approximately 7.5 million residential consumers in addition to commercial, industrial, and wholesale customers, supported by approximately 16 GW of generation. The Company's business is segmented as follows: • Texas, which includes all activity related to customer, plant and market operations in Texas, other than Cottonwood; • East, which includes all activity related to customer, plant and market operations in the East; • West/Services/Other, which includes the following assets and activities: (i) all activity related to customer, plant and market operations in the West and Canada, (ii) the Services businesses (iii) activity related to the Cottonwood facility, (iv) the remaining renewables activity, including the Company’s equity method investment in Ivanpah Master Holdings, LLC, and (v) activity related to the Company’s equity method investment for the Gladstone power plant in Australia; • Vivint Smart Home; and • Corporate activities. 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 consolidated financial statements in the Company's 2022 Form 10-K. 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, 2023, and the results of operations, comprehensive income, cash flows and statements of stockholders' equity for the three and six months ended June 30, 2023 and 2022. 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 period amounts have been reclassified for comparative purposes. The reclassifications did not affect consolidated results from operations, net assets or consolidated cash flows.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Vivint Smart Home Flex Pay Under the Flex Pay plan (“Flex Pay”), offered by Vivint Smart Home, subscribers pay separately for smart home products and smart home and security services. The subscriber has the ability to pay for Vivint Smart Home products in the following three ways: (i) qualified subscribers may finance the purchase through third-party financing providers ("Consumer Financing Program" or “CFP”), (ii) Vivint Smart Home generally offers a limited number of subscribers not eligible for the CFP, but who qualify under Vivint Smart Home underwriting criteria, the option to enter into a retail installment contract directly with Vivint Smart Home or (iii) subscribers may conduct purchases by check, automatic clearing house payments, credit or debit card or by obtaining short term financing (generally no more than six-month installment terms) through Vivint Smart Home. Although subscribers pay separately for products and services under Flex Pay, the Company has determined that the sale of products and services are one single performance obligation resulting in deferred revenue for the gross amount of products sold. For products financed through the CFP, gross deferred revenues are reduced by (i) any fees the third-party financing provider (“Financing Provider”) is contractually entitled to receive at the time of loan origination, and (ii) the present value of expected future payments due to the Financing Providers . Loans are issued on either an installment or revolving basis with repayment terms ranging from 6 to 60 months. For certain Financing Provider loans: • Vivint Smart Home pays a monthly fee based on either the average daily outstanding balance of the installment loans, or the number of outstanding loans. • Vivint Smart Home incurs fees at the time of the loan origination and receives proceeds that are net of these fees. • Vivint Smart Home also shares liability for credit losses, with Vivint Smart Home being responsible for between 2.6% and 100% of lost principal balances. Due to the nature of these provisions, the Company records a derivative liability at its fair value when the Financing Provider originates loans to subscribers, which reduces the amount of estimated revenue recognized on the provision of the services. The derivative liability is reduced as payments are made by Vivint Smart Home to the Financing Provider. Subsequent changes to the fair value of the derivative liability are realized through other income, net in the consolidated statements of operations. For further discussion, see Note 7, Accounting for Derivative Instruments and Hedging Activities . Capitalized Contract Costs Capitalized contract costs represent the costs directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts. These costs include installed products, commissions, other compensation and cost of installation of new or upgraded customer contracts. The Company calculates amortization by accumulating all deferred contract costs into separate portfolios based on the initial month of service and amortizes those deferred contract costs on a straight-line basis over the expected period of benefit, consistent with the pattern in which the Company provides services to its customers. The expected period of benefit for customers is approximately five years. The Company updates its estimate of the period of benefit periodically and whenever events or circumstances indicate that the period of benefit could change significantly. Such changes, if any, are accounted for prospectively as a change in estimate. Amortization of capitalized contract costs are included in cost of operations and selling, general and administrative costs on the consolidated statements of operations. Contract costs not directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts are expensed as incurred. Other Balance Sheet Information The following table presents the accumulated depreciation included in property, plant and equipment, net and accumulated amortization included in customer relationships, net and other intangible assets, net: (In millions) June 30, 2023 December 31, 2022 Property, plant and equipment accumulated depreciation $ 1,351 $ 1,478 Customer relationships and other intangible assets accumulated amortization 2,394 2,112 Credit Losses Retail trade receivables are reported on the balance sheet net of the allowance for credit losses within accounts receivables, net. Long-term receivables are recorded net in other non-current assets in the consolidated balance sheets. The Company accrues a provision 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, 2023 and 2022: Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Beginning balance $ 121 $ 666 $ 133 $ 683 Acquired balance from Vivint Smart Home — — 22 — Provision for credit losses 45 26 80 51 Write-offs (66) (71) (144) (121) Recoveries collected 12 6 21 14 Other 8 — 8 — Ending balance $ 120 $ 627 $ 120 $ 627 Cash and Cash Equivalents, Funds Deposited by Counterparties and 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, 2023 December 31, 2022 Cash and cash equivalents $ 422 $ 430 Funds deposited by counterparties 365 1,708 Restricted cash 26 40 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 813 $ 2,178 Funds deposited by counterparties consist of cash held by the Company as a result of collateral posting obligations from its counterparties related to NRG's hedging program. The decrease in funds deposited by counterparties is driven by the significant decrease in forward positions as a result of decreases in natural gas and power prices compared to December 31, 2022. Though some amounts are segregated into separate accounts, not all funds are contractually restricted. Based on the Company's intention, these funds are not available for the payment of general corporate obligations; however, they are available for liquidity management. Depending on market fluctuations and the settlement of the underlying contracts, the Company will refund this collateral to the 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 to satisfy the requirements of certain financing agreements and funds held within the Company's projects that are restricted in their uses. Goodwill The following table represents the changes in goodwill during the six months ended June 30, 2023: (In millions) Texas East West/Services/Other Vivint Smart Home Total Balance as of December 31, 2022 $ 710 $ 723 $ 217 $ — $ 1,650 Goodwill resulting from the acquisition of Vivint Smart Home — — — 3,492 3,492 Sale of business — (2) — — (2) Foreign currency translation adjustments — — 3 — 3 Balance as of June 30, 2023 $ 710 $ 721 $ 220 $ 3,492 $ 5,143 Recent Accounting Developments - Guidance Adopted in 2023 ASU 2021-08 — In October 2021, the FASB issued ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , or ASU 2021-08, which requires that an entity recognize and measure contract assets and contract liabilities acquired in a business combination as if it had originated the contracts in accordance with ASC 606, Revenue from Contracts with Customers. As a result, an acquirer should recognize and

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Vivint Smart Home Retail Revenue Vivint Smart Home offers its subscribers combinations of smart home products and services, which together create an integrated smart home system that allows the Company's subscribers to monitor, control and protect their homes. As the products and services included in the subscriber's contract are integrated and highly interdependent, and because the products (including installation) and services must work together to deliver the monitoring, controlling and protection of their home, the Company has concluded that the products and services contracted for by the subscriber are generally not distinct within the context of the contract and, therefore, constitute a single, combined performance obligation. Revenues for this single, combined performance obligation are recognized on a straight-line basis over the subscriber's contract term, which is the period in which the parties to the contract have enforceable rights and obligations. The Company has determined that certain contracts that do not require a long-term commitment for monitoring services by the subscriber contain a material right to renew the contract, because the subscriber does not have to purchase the products upon renewal. Proceeds allocated to the material right are recognized over the period of the benefit. The majority of Vivint Smart Home's subscription contracts are five years and are generally non-cancelable. These contracts generally convert into month-to-month agreements at the end of the initial term, while some subscribers are month-to-month from inception. Payment for Vivint Smart Home services is generally due in advance on a monthly basis. Product sales and other one-time fees are invoiced to subscribers at time of sale. Revenues for any products or services that are considered separate performance obligations are recognized upon delivery. Payments received or billed in advance are reported as deferred revenues. Performance Obligations As of June 30, 2023, estimated future fixed fee performance obligations are $742 million for the remaining six months of fiscal year 2023, and $1.3 billion, $949 million, $622 million, $336 million and $42 million for the fiscal years 2024, 2025, 2026, 2027 and 2028, respectively. These performance obligations include Vivint Smart Home products and services as well as cleared auction MWs in the PJM, ISO-NE, NYISO and MISO capacity auctions. The cleared auction MWs 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, 2023 and 2022: Three months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 1,563 $ 446 $ 406 $ 444 $ — $ 2,859 Business 832 1,912 424 — — 3,168 Total retail revenue (b) 2,395 2,358 830 444 — 6,027 Energy revenue (b) 16 28 40 — (1) 83 Capacity revenue (b) — 49 — — — 49 Mark-to-market for economic hedging activities (c) — 52 23 — — 75 Contract amortization — (7) (1) — — (8) Other revenue (b) 104 23 — — (5) 122 Total revenue 2,515 2,503 892 444 (6) 6,348 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 6 7 — — 13 Less: Realized and unrealized ASC 815 revenue 14 99 7 — (1) 119 Total revenue from contracts with customers $ 2,501 $ 2,398 $ 878 $ 444 $ (5) $ 6,216 (a) Home includes Services and Vivint Smart Home (b) 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/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 16 $ — $ — $ — $ 16 Energy revenue — 13 (7) — (1) 5 Capacity revenue — 17 — — — 17 Other revenue 14 1 (9) — — 6 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate/Eliminations Total Retail revenue: Home (a) $ 1,655 $ 417 $ 543 $ (1) $ 2,614 Business 910 2,983 444 — 4,337 Total retail revenue 2,565 3,400 987 (1) 6,951 Energy revenue (b) 38 128 131 9 306 Capacity revenue (b) — 89 1 — 90 Mark-to-market for economic hedging activities (c) (1) (106) (38) (3) (148) Contract amortization — (11) (2) — (13) Other revenue (b) 90 14 (3) (5) 96 Total revenue 2,692 3,514 1,076 — 7,282 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — (4) 8 — 4 Less: Realized and unrealized ASC 815 revenue (13) (123) (70) 7 (199) Total revenue from contracts with customers $ 2,705 $ 3,641 $ 1,138 $ (7) $ 7,477 (a) Home includes Services (b) 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/Services/Other Corporate/Eliminations Total Energy revenue $ — $ (19) $ (20) $ 9 $ (30) Capacity revenue — 9 — — 9 Other revenue (12) (7) (12) 1 (30) (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate/Eliminations Total Retail revenue: Home (b) $ 2,799 $ 1,097 $ 1,031 $ 592 $ — $ 5,519 Business 1,554 5,277 1,040 — — 7,871 Total retail revenue (c) 4,353 6,374 2,071 592 — 13,390 Energy revenue (c) 20 102 88 — 1 211 Capacity revenue (c) — 90 1 — — 91 Mark-to-market for economic hedging activities (d) — 87 90 — (11) 166 Contract amortization — (18) (1) — — (19) Other revenue (c) 176 44 17 — (6) 231 Total revenue 4,549 6,679 2,266 592 (16) 14,070 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 5 16 — — 21 Less: Realized and unrealized ASC 815 revenue 12 212 104 — (10) 318 Total revenue from contracts with customers $ 4,537 $ 6,462 $ 2,146 $ 592 $ (6) $ 13,731 (a) Includes results of operations following the acquisition date of March 10, 2023 (b) Home includes Services and Vivint Smart Home (c) 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/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 43 $ — $ — $ — $ 43 Energy revenue — 60 10 — 1 71 Capacity revenue — 23 — — — 23 Other revenue 12 (1) 4 — — 15 (d) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate/Eliminations Total Retail revenue: Home (a) $ 2,938 $ 996 $ 1,246 $ (1) $ 5,179 Business 1,573 6,925 844 — 9,342 Total retail revenue 4,511 7,921 2,090 (1) 14,521 Energy revenue (b) 53 332 185 14 584 Capacity revenue (b) — 204 2 — 206 Mark-to-market for economic hedging activities (c) (3) (236) (56) 14 (281) Contract amortization — (20) (2) — (22) Other revenue (b) 151 28 1 (10) 170 Total revenue 4,712 8,229 2,220 17 15,178 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — (13) 19 — 6 Less: Realized and unrealized ASC 815 revenue (20) (189) (112) 27 (294) Total revenue from contracts with customers $ 4,732 $ 8,431 $ 2,313 $ (10) $ 15,466 (a) Home includes Services (b) 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/Services/Other Corporate/Eliminations Total Energy revenue $ — $ 26 $ (40) $ 13 $ (1) Capacity revenue — 22 — — 22 Other revenue (17) (1) (16) — (34) (c) 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, 2023 and December 31, 2022: (In millions) June 30, 2023 December 31, 2022 Deferred customer acquisition costs $ 422 $ 126 Accounts receivable, net - Contracts with customers 3,049 4,704 Accounts receivable, net - Accounted for under topics other than ASC 606 194 64 Accounts receivable, net - Affiliate 31 5 Total accounts receivable, net $ 3,274 $ 4,773 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 1,297 $ 1,952 Deferred revenues (a) 1,658 186 (a) Deferred revenues from contracts with customers as of June 30, 2023 and December 31, 2022 were approximately $1.6 billion and $175 million, respectively. The increase in deferred revenues is primarily due to acquisition of Vivint Smart Home The revenue recognized from contracts with customers during the six months ended June 30, 2023 and 2022 relating to the deferred revenue balance at the beginning of each period was $168 million and $117 million, respectively. The change in deferred revenue balances recognized during the six months ended June 30, 2023 and 2022 was primarily due to the timing difference of when consideration was received and when the performance obligation was transferred. The revenue recognized from contracts with customers during the three months ended June 30, 2023 and 2022 relating to the deferred revenue balance at the beginning of each period was $310 million and $106 million, respectively. The change in deferred revenue balances recognized during the three months ended June 30, 2023 was primarily due to the acquisition of Vivint Smart Home.

Acquisitions and Dispositions

Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions Vivint Smart Home Acquisition On March 10, 2023 (the "Acquisition Closing Date"), the Company completed the acquisition of Vivint Smart Home, Inc., pursuant to the Agreement and Plan of Merger, dated as of December 6, 2022, by and among the Company, Vivint Smart Home, Inc. and Jetson Merger Sub, Inc., a wholly-owned subsidiary of the Company (“Merger Sub”) pursuant to which Merger Sub merged with and into Vivint Smart Home, Inc., with Vivint Smart Home, Inc. surviving the merger as a wholly-owned subsidiary of the Company. Dedicated to redefining the home experience with intelligent products and services, Vivint Smart Home brings approximately two million subscribers to NRG. Vivint Smart Home's single, expandable platform incorporates artificial intelligence and machine learning into its operating system and its vertically integrated business model includes hardware, software, sales, installation, support and professional monitoring, enabling superior subscriber experiences and a complete end-to-end smart home experience. The acquisition accelerates the realization of NRG's consumer-focused growth strategy and creates a leading essential home services platform fueled by market-leading brands, unparalleled insights, proprietary technologies and complementary sales channels. NRG paid $12 per share, or $2.6 billion in cash. The Company funded the acquisition using: • proceeds of $724 million from newly issued $740 million 7.000% Senior Secured First Lien Notes due 2033, net of issuance costs and discount; • proceeds of $635 million from newly issued $650 million 10.25% Series A Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock, net of issuance costs; • proceeds of approximately $900 million drawn from its Revolving Credit Facility and Receivables Securitization Facilities; and • cash on hand. In February 2023, the Company increased its Revolving Credit Facility by $600 million to meet the additional liquidity requirements related to the acquisition. For further discussion, see Note 9, Long-term Debt and Finance Leases . Acquisition costs of $2 million and $38 million for the three and six months ended June 30, 2023, respectively, are included in acquisition-related transaction and integration costs in the Company's consolidated statement of operations. The acquisition has been recorded as a business combination under ASC 805, with identifiable assets and liabilities acquired provisionally recorded at their estimated Acquisition Closing Date fair value. The initial accounting for the business combination is not complete because the evaluation necessary to assess the fair value of certain net assets acquired and the amount of goodwill to be recognized is still in process. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the Acquisition Closing Date. The total consideration of $2.623 billion includes: (In millions) Vivint Smart Home, Inc. common shares outstanding as of March 10, 2023 of 216,901,639 at $12.00 per share $ 2,603 Other Vivint Smart Home, Inc. equity instruments (Cash out RSUs and PSUs, Stock Appreciation Rights, Private Placement Warrants) 6 Total Cash Consideration $ 2,609 Fair value of acquired Vivint Smart Home, Inc. equity awards attributable to pre-combination service 14 Total Consideration $ 2,623 The purchase price is provisionally allocated as follows: (In millions) Current Assets Cash and cash equivalents $ 120 Accounts receivable, net 60 Inventory 113 Prepayments and other current assets 37 Total current assets 330 Property, plant and equipment, net 49 Other Assets Operating lease right-of-use assets, net 35 Goodwill (a) 3,492 Intangible assets, net (b) : Customer relationships 1,740 Technology 860 Trade name 160 Sales channel contract 10 Intangible assets, net 2,770 Deferred income taxes 381 Other non-current assets 14 Total other assets 6,692 Total Assets $ 7,071 Current Liabilities Current portion of long-term debt and finance leases $ 14 Current portion of operating lease liabilities 13 Accounts payable 109 Derivatives instruments 80 Deferred revenue current 517 Accrued expenses and other current liabilities 207 Total current liabilities 940 Other Liabilities Long-term debt and finance leases 2,572 Non-current operating lease liabilities 28 Derivatives instruments 32 Deferred income taxes 18 Deferred revenue non-current 835 Other non-current liabilities 23 Total other liabilities 3,508 Total Liabilities $ 4,448 Vivint Smart Home Purchase Price $ 2,623 (a) Goodwill arising from the acquisition is attributed to the value of the platform acquired, cross-selling opportunities, subscriber growth and the synergies expected from combining the operations of Vivint Smart Home with NRG's existing businesses. None of the goodwill recorded is expected to be deductible for tax purposes (b) The weighted average amortization period for total amortizable intangible assets is approximately ten years Measurement Period Adjustments The following measurement period adjustments were recognized during the quarter ended June 30, 2023: (In millions) (Decrease)/Increase Goodwill $ (200) Intangible assets, net 270 Deferred income taxes (70) Net change in assets $ — The measurement period adjustments to the provisional amounts are primarily attributable to refinement of the underlying assumptions used to estimate the fair value of assets acquired as more information was obtained about facts and circumstances that existed as of the Acquisition Closing Date. Fair Value Measurement of Intangible Assets The fair values of intangible assets as of the Acquisition Closing Date were measured primarily based on significant inputs that are observable and unobservable in the market and thus represent Level 2 and Level 3 measurements, respectively. Significant inputs were as follows: Customer relationships — Customer relationships, reflective of Vivint Smart Home’s subscriber base, were valued using an excess earning method of the income approach, and is classified as Level 3. Under this approach, the Company estimated the present value of expected future cash flows resulting from existing subscriber relationships, considering attrition and charges for contributory assets (such as net working capital, fixed assets, workforce, trade name and technology) utilized in the business, discounted using a weighted average cost of capital of comparable companies. The subscriber relationships are amortized to depreciation and amortization, ratably based on discounted future cash flows. The weighted average amortization period is twelve years. Technology – Developed technology was valued using a "relief from royalty" method of the income approach, and is classified as Level 3. Under this approach, the fair value was estimated to be the present value of royalties saved which assumed the value of the asset based on discounted cash flows of the amount that would be paid by a hypothetical market participant had they not owned the asset and instead licensed the asset from another company. The estimated cash flows from the developed technology considered the obsolescence factor and was discounted using a weighted average cost of capital of comparable companies. The developed technology is amortized to depreciation and amortization, ratably based on discounted future cash flows. The weighted average amortization period is five years. Trade name — Trade name was valued using a "relief from royalty" method of the income approach, and is classified as Level 3. Under this approach, the fair value is estimated to be the present value of royalties saved which assumed the value of the asset based on discounted cash flows of the amount that would be paid by a hypothetical market participant had they not owned the asset and instead licensed the asset from another company. The estimated cash flows from the trade name considered the expected probable use of the asset and was discounted using a weighted average cost of capital of comparable companies. The trade name is amortized to depreciation and amortization, on a straight line basis, over an amortization period of ten years. Fair Value Measurement of Acquired Vivint Smart Home Debt The Company acquired $2.7 billion in aggregate principal of Vivint Smart Home’s 2027 Senior Secured Notes, 2029 Senior notes and 2028 Senior Secured Term Loan (together, the "Acquired Vivint Smart Home Debt") which were recorded at fair value as of the Acquisition Closing Date. The difference between the fair value at the Acquisition Closing Date and the principal outstanding of the Acquired Vivint Smart Home Debt, of $152 million, is being amortized through interest expense over the remaining term of the debt. The Acquired Vivint Smart Home Debt are classified as Level 2 and were measured at fair value using observable market inputs based on interest rates at the Acquisition Closing Date. For additional discussion, see Note 9, Long-term Debt and Finance Leases. Fair Value Measurement of Derivatives Liabilities The derivative liabilities are recorded in connection with the contractual future payment obligations with the financing providers under Vivint Smart Home’s Consumer Financing Program. The fair values of the derivatives liabilities as of the Acquisition Closing Date were valued using a discounted cash flow model, with inputs consisting of available market data, such as market yield discount rates, as well as unobservable internally derived assumptions, such as collateral prepayment rates, collateral default rates and loss severity rates. These derivatives are priced using a credit valuation adjustment methodology, and are classified as Level 3. Changes to the fair value are recorded through other income, net in the Consolidated Statement of Operations. For additional discussion, see Note 7, Accounting for Derivative Instruments and Hedging Activities . Supplemental Pro Forma Financial Information for the three and six months ended June 30, 2023 and 2022 The following table provides pro forma combined financial information of NRG and Vivint Smart Home, after giving effect to the Vivint Smart Home acquisition and related financing transactions as if they had occurred on January 1, 2022. The pro forma financial information has been prepared for illustrative and informational purposes only, and is not intended to project future operating results or be indicative of what the Company's financial performance would have been had the transactions occurred on the date acquired. No effect has been given to prospective operating synergies. Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Total operating revenues $ 6,348 $ 7,690 $ 14,356 $ 15,978 Net income/(loss) 342 466 (955) 2,018 Amounts above reflect certain pro forma adjustments that were directly attributable to the Vivint Smart Home acquisition. These adjustments include the following: (i) Income statement effects of fair value adjustments based on the preliminary purchase price allocation including amortization of intangible assets, reversal of historical Vivint Smart Home amortization of capitalized contract costs and reversal of historical Vivint Smart Home other income recorded for the change in fair value of warrant derivative liabilities, as the warrants are assumed to be cashed out upon the Acquisition Closing Date. (ii) One time expenses directly related to the acquisition. (iii) Adjustments to reflect all acquisition and related transactions costs in the six months ended June 30, 2022. (iv) Interest expense assumes the financing transactions directly attributable to the Vivint Smart Home acquisition occurred on January 1, 2022. (v) Adjustments related to recording Vivint Smart Home's historical debt at Acquisition Closing Date fair value. (vi) Adjustments to reflect the write-off of short-term deferred financing costs related to the bridge facility put in place for the acquisition prior to securing permanent financing during the six months ended June 30, 2022 period instead of the six months ended June 30, 2023 period. (vii) Income tax effect of the acquisition accounting adjustments and financing adjustments (adjusted for permanents book/tax differences) based on combined blended federal/state tax rate for all periods presented. Dispositions Planned sale of the 44% equity interest in STP On May 31, 2023, the Company entered into a definitive equity purchase agreement with Constellation Energy Generation ("Constellation") to sell its 44% equity interest in STP for $1.75 billion, subject to customary purchase price adjustments. The transaction is expected to close by the end of 2023 and is subject to regulatory approval by the NRC. The waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, expired in July 2023. In July 2023, the City Public Service Board of San Antonio (“CPS”) filed a lawsuit claiming the existence of a right of first refusal to the STP sale transaction (the “CPS Lawsuit”). Austin Energy intervened in the CPS Lawsuit claiming a similar right of first refusal. On July 31, 2023, CPS and Austin Energy jointly filed a motion with the NRC seeking to dismiss the pending License Transfer Application (“LTA”) between NRG and Constellation, or to halt their review of the LTA pending resolution of the CPS lawsuit. NRG filed its answer to the CPS/Austin Energy motion on August 4, 2023. Sale of Astoria On January 6, 2023, the Company closed on the sale of land and related generation assets from the Astoria site, within the East region of operations, for initial proceeds of $212 million, subject to transaction fees of $3 million and certain indemnifications, resulting in a $199 million gain. As part of the transaction, NRG entered into an agreement to lease the land back for the purpose of operating the Astoria gas turbines. The lease agreement is expected to terminate by the end of the year after decommissioning is complete. Sale of Watson On June 1, 2022, the Company closed on the sale of its 49% ownership in the Watson natural gas generating facility for $59 million. The Company recorded a gain on the sale of $46 million. Held-for-sale As of June 30, 2023, the following is classified as held for sale in the Condensed Consolidated Balance Sheets, primarily related to the planned sale of STP, which is in the Texas segment: (In millions) Inventory $ 63 Prepayments and other current assets 12 Current assets - held-for-sale $ 75 Property, plant and equipment, net $ 227 Intangible assets, net 12 Nuclear decommissioning trust fund 922 Non-current assets - held-for-sale $ 1,161 Total assets held-for-sale $ 1,236 Current liabilities - held-for-sale $ 36 Nuclear decommissioning reserve $ 336 Nuclear decommissioning trust liability 551 Other non-current liabilities 60 Non-current liabilities - held-for-sale $ 947 Total liabilities held-for-sale $ 983 The Company recorded income before income taxes from its 44% equity interest in STP as follows: Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Income before income taxes (a) $ 23 $ 121 $ 7 $ 156

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2023
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 value and fair value of the Company's long-term debt, including current portion, is as follows: June 30, 2023 December 31, 2022 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Convertible Senior Notes $ 575 $ 618 $ 575 $ 576 Other long-term debt, including current portion 11,535 10,563 7,523 6,432 Total long-term debt, including current portion (a) $ 12,110 $ 11,181 $ 8,098 $ 7,008 (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 and the Vivint Smart Home Senior Secured Term Loan are based on quoted market prices and are classified as Level 2 within the fair value hierarchy. The estimated fair value of the borrowing under the Revolving Credit Facility approximates the carrying value because the interest rates vary with market interest rates, and is 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, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 (In millions) Level 2 Level 3 Level 2 Level 3 Convertible Senior Notes $ 618 $ — $ 576 $ — Other long-term debt, including current portion 9,863 700 6,432 — Total long-term debt, including current portion $ 10,481 $ 700 $ 7,008 $ — 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, 2023 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 19 $ — $ 19 $ — Nuclear trust fund investments (classified within non-current assets - held-for-sale): Cash and cash equivalents 21 21 — — U.S. government and federal agency obligations 90 88 2 — Federal agency mortgage-backed securities 103 — 103 — Commercial mortgage-backed securities 34 — 34 — Corporate debt securities 116 — 116 — Equity securities 464 464 — — Foreign government fixed income securities 1 — 1 — Derivative assets: Foreign exchange contracts 8 — 8 — Commodity contracts 7,301 1,225 4,564 1,512 Interest rate contracts 24 — 24 — Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments (classified within non-current assets - held-for-sale) 93 Equity securities (classified within other non-current assets) 6 Total assets $ 8,280 $ 1,798 $ 4,871 $ 1,512 Derivative liabilities: Foreign exchange contracts $ 6 $ — $ 6 $ — Commodity contracts 5,600 1,072 3,921 607 Consumer Financing Program 115 — — 115 Total liabilities $ 5,721 $ 1,072 $ 3,927 $ 722 December 31, 2022 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 19 $ — $ 19 $ — Nuclear trust fund investments: Cash and cash equivalents 15 15 — — U.S. government and federal agency obligations 86 84 2 — Federal agency mortgage-backed securities 101 — 101 — Commercial mortgage-backed securities 35 — 35 — Corporate debt securities 114 — 114 — Equity securities 403 403 — — Foreign government fixed income securities 1 — 1 — Other trust fund investments (classified within other non-current assets): U.S. government and federal agency obligations 1 1 — — Derivative assets: Foreign exchange contracts 18 — 18 — Commodity contracts 11,976 1,929 8,796 1,251 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 83 Equity securities (classified within other non-current assets) 6 Total assets $ 12,858 $ 2,432 $ 9,086 $ 1,251 Derivative liabilities: Foreign exchange contracts $ 2 $ — $ 2 $ — Commodity contracts 8,439 1,244 6,449 746 Total liabilities $ 8,441 $ 1,244 $ 6,451 $ 746 The following table reconciles, for the three and six months ended June 30, 2023 and 2022, the beginning and ending balances for financial instruments that are recognized at fair value in the condensed consolidated financial statements, using significant unobservable inputs, for commodity derivatives: Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Commodity Derivatives (a) (In millions) Three months ended June 30, 2023 Three months ended June 30, 2022 Six months ended June 30, 2023 Six months ended June 30, 2022 Beginning balance $ 471 $ 528 $ 505 $ 293 Total (losses)/gains realized/unrealized included in earnings (86) 293 (177) 459 Purchases 99 6 140 29 Transfers into Level 3 (b) 414 568 438 621 Transfers out of Level 3 (b) 7 8 (1) 1 Ending balance $ 905 $ 1,403 $ 905 $ 1,403 (Losses)/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 $ (76) $ 297 $ (131) $ 534 (a) Consists of derivative assets and liabilities, net, excluding derivatives liabilities from Consumer Financing Program, which are presented in a separate table below (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 Realized and unrealized gains and losses included in earnings that are related to the commodity derivatives are recorded in revenues and cost of operations. The following table reconciles, for the three and six months ended June 30, 2023 the beginning and ending balances of the contractual obligations from the Consumer Financing Program 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) Consumer Financing Program (In millions) Three months ended June 30, 2023 Six months ended June 30, 2023 Beginning balance $ 111 $ — Contractual obligations added from the acquisition of Vivint Smart Home — 112 New contractual obligations 20 22 Settlements (19) (22) Total losses included in earnings 3 3 Ending balance $ 115 $ 115 Gains and losses that are related to the Consumer Financing Program derivative are recorded in other income, net. 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, 2023, contracts valued with prices provided by models and other valuation techniques make up 21% of derivative assets and 13% of derivative liabilities. NRG's significant positions classified as Level 3 include physical and financial natural gas and power contracts executed in illiquid markets, as well as FTRs. The significant unobservable inputs used in developing fair value include illiquid natural gas and 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 Consumer Financing Program derivatives are valued using a discounted cash flow model, with inputs consisting of available market data, such as market yield discount rates, as well as unobservable internally derived assumptions, such as collateral prepayment rates, collateral default rates and loss severity rates. These derivatives are priced quarterly using a credit valuation adjustment methodology. 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, 2023 and December 31, 2022: June 30, 2023 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 105 $ 123 Discounted Cash Flow Forward Market Price (per MMBtu) $ 1 $ 17 $ 4 Power Contracts 1,373 427 Discounted Cash Flow Forward Market Price (per MWh) 1 263 47 FTRs 34 57 Discounted Cash Flow Auction Prices (per MWh) (23) 146 1 Consumer Financing Program — 115 Discounted Cash Flow Collateral Default Rates 1.51 % 76.59 % 5.86 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.64 % Discounted Cash Flow Loss Severity Rates 6.00 % 36.00 % 10.20 % $ 1,512 $ 722 December 31, 2022 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 340 $ 448 Discounted Cash Flow Forward Market Price (per MMBtu) $ 2 $ 48 $ 6 Power Contracts 843 216 Discounted Cash Flow Forward Market Price (per MWh) 3 431 48 FTRs 68 82 Discounted Cash Flow Auction Prices (per MWh) (32) 610 0 $ 1,251 $ 746 The following table provides sensitivity of fair value measurements to increases/(decreases) in significant, unobservable inputs as of June 30, 2023 and December 31, 2022: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Natural Gas/Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Natural Gas/Power Sell Increase/(Decrease) Lower/(Higher) FTR Prices Buy Increase/(Decrease) Higher/(Lower) FTR Prices Sell Increase/(Decrease) Lower/(Higher) Collateral Default Rates n/a Increase/(Decrease) Higher/(Lower) Collateral Prepayment Rates n/a Increase/(Decrease) Lower/(Higher) Loss Severity Rates n/a Increase/(Decrease) Higher/(Lower) 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, 2023, the credit reserve resulted in a $8 million decrease primarily within cost of operations. As of December 31, 2022, the credit reserve resulted in a $9 million decrease primarily within 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 2022 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 2022 Form 10-K. As of June 30, 2023, counterparty credit exposure, excluding credit exposure from RTOs, ISOs, registered commodity exchanges and certain long-term agreements, was $1.9 billion and NRG held collateral (cash and letters of credit) against those positions of $616 million, resulting in a net exposure of $1.3 billion. 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 59% of the Company's exposure before collateral is expected to roll off by the end of 2024. 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 73 % Financial institutions 27 Total as of June 30, 2023 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 55 % Non-investment grade/non-rated 45 Total as of June 30, 2023 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 exposure to one wholesale counterparty in excess of 10% of total net exposure as of June 30, 2023. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. RTOs and ISOs The Company participates in the organized markets of CAISO, ERCOT, AESO, IESO, ISO-NE, MISO, NYISO and PJM, known as RTOs or ISOs. Trading in the majority of these markets is approved by FERC, whereas in the case of ERCOT, it is approved by the PUCT, and whereas in the case of AESO and IESO, both exist provincially with AESO primarily subject to Alberta Utilities Commission and the IESO to the Ontario Energy Board. These ISOs may include 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 Renewable PPAs. As external sources or observable market quotes are not always 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, 2023, aggregate credit risk exposure managed by NRG to these counterparties was approximately $889 million for the next five years. Retail Customer Credit Risk The Company is exposed to retail credit risk through the Company's retail electricity and gas providers as well as through Vivint Smart Home, which serve both Home and Business customers. 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, which include monitoring of the portfolio and the use of credit mitigation measures such as deposits or prepayment arrangements. As of June 30, 2023, the Company's retail customer credit exposure to Home and Business customers was diversified across many customers and various industries, as well as government entities. 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, 2023
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. As of June 30, 2023, the trust liability is classified within non-current liabilities - held-for-sale on the Company's condensed consolidated balance sheet. 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, 2023, the trust funds are classified within non-current assets - held-for-sale on the Company's condensed consolidated balance sheet. As of June 30, 2023 As of December 31, 2022 (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 $ 21 $ — $ — — $ 15 $ — $ — — U.S. government and federal agency obligations 90 1 5 12 86 — 5 11 Federal agency mortgage-backed securities 103 — 8 25 101 — 11 26 Commercial mortgage-backed securities 34 — 4 29 35 — 4 30 Corporate debt securities 116 — 10 12 114 — 13 12 Equity securities 557 408 — — 486 346 3 — Foreign government fixed income securities 1 — — 20 1 — — 17 Total $ 922 $ 409 $ 27 $ 838 $ 346 $ 36 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) 2023 2022 Realized gains $ 6 $ 8 Realized losses (10) (11) Proceeds from sale of securities 180 278

Accounting for Derivative Instr

Accounting for Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2023
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, 2023, NRG had energy-related derivative instruments extending through 2036. The Company marks these derivatives to market through the statement of operations. NRG has executed energy-related contracts extending through 2036 that qualified for the NPNS exception and were therefore exempt from fair value accounting treatment. Interest Rate Swaps NRG is exposed to changes in interest rate through the Company's issuance of variable rate debt. In order to manage the Company's interest rate risk, NRG enters into interest rate swap agreements. In the first quarter of 2023, the Company entered into $1.0 billion of interest rate swaps through 2027 to hedge the floating rate on the Term Loan acquired with the Vivint Smart Home acquisition. Additionally, the Company has entered into interest rate swaps to hedge the floating rate on the Revolving Credit Facility extending through 2024, with $400 million outstanding as of June 30, 2023. Foreign Exchange Contracts NRG is exposed to changes in foreign currency primarily associated with the purchase of USD denominated natural gas for its Canadian business. In order to manage the Company's foreign exchange risk, NRG entered into foreign exchange contracts. As of June 30, 2023, NRG had foreign exchange contracts extending through 2027. The Company marks these derivatives to market through the statement of operations. Consumer Financing Program Under the Consumer Financing Program, Vivint Smart Home pays a monthly fee to Financing Providers based on either the average daily outstanding balance of the Loans or the number of outstanding Loans. For certain loans, Vivint Smart Home incurs fees at the time of the loan origination and receives proceeds that are net of these fees. Vivint Smart Home also shares the liability for credit losses, depending on the credit quality of the subscriber. Due to the nature of certain provisions under the Consumer Financing Program, the Company records a derivative liability that is not designated as a hedging instrument and is adjusted to fair value, measured using the present value of the estimated future payments. Changes to the fair value are recorded through other income, net in the Consolidated Statement of Operations. The following represent the contractual future payment obligations with the Financing Providers under the Consumer Financing Program that are components of the derivative: • Vivint Smart Home pays either a monthly fee based on the average daily outstanding balance of the Loans, or the number of outstanding Loans, depending on the Financing Provider; • Vivint Smart Home shares the liability for credit losses depending on the credit quality of the subscriber; and • Vivint Smart Home pays transactional fees associated with subscriber payment processing. The derivative is classified as a Level 3 instrument. The derivative positions are valued using a discounted cash flow model, with inputs consisting of available market data, such as market yield discount rates, as well as unobservable internally derived assumptions, such as collateral prepayment rates, collateral default rates and loss severity rates. These derivatives are priced quarterly using a credit valuation adjustment methodology. In summary, the fair value represents an estimate of the present value of the cash flows Vivint Smart Home will be obligated to pay to the Financing Provider for each component of the derivative. 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, 2023 and December 31, 2022. 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, 2023 December 31, 2022 Emissions Short Ton — 1 Renewable Energy Certificates Certificates 13 15 Coal Short Ton 12 11 Natural Gas MMBtu 804 422 Oil Barrels — 1 Power MWh 210 192 Consumer Financing Program Dollars 942 — Foreign Exchange Dollars 590 569 Interest Dollars 1,400 — 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, 2023 December 31, 2022 June 30, 2023 December 31, 2022 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Interest rate contracts - current $ 20 $ — $ — $ — Interest rate contracts - long-term 4 — — — Foreign exchange contracts - current 5 11 3 1 Foreign exchange contracts - long-term 3 7 3 1 Consumer Financing Program - short-term — — 78 — Consumer Financing Program - long-term — — 37 — Commodity contracts - current 4,398 7,875 3,751 6,194 Commodity contracts - long-term 2,903 4,101 1,849 2,245 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 7,333 $ 11,994 $ 5,721 $ 8,441 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, 2023 Foreign exchange contracts: Derivative assets $ 8 $ (5) $ — $ 3 Derivative liabilities (6) 5 — (1) Total foreign exchange contracts $ 2 $ — $ — $ 2 Commodity contracts: Derivative assets $ 7,301 $ (5,344) $ (340) $ 1,617 Derivative liabilities (5,600) 5,344 5 (251) Total commodity contracts $ 1,701 $ — $ (335) $ 1,366 Consumer Financing Program: Derivative liabilities $ (115) $ — $ — $ (115) Interest rate contracts: Derivative assets $ 24 $ — $ — $ 24 Total derivative instruments $ 1,612 $ — $ (335) $ 1,277 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, 2022 Foreign exchange contracts: Derivative assets $ 18 $ (2) $ — $ 16 Derivative liabilities (2) 2 — — Total foreign exchange contracts $ 16 $ — $ — $ 16 Commodity contracts: Derivative assets $ 11,976 $ (7,897) $ (1,659) $ 2,420 Derivative liabilities (8,439) 7,897 20 (522) Total commodity contracts $ 3,537 $ — $ (1,639) $ 1,898 Total derivative instruments $ 3,553 $ — $ (1,639) $ 1,914 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 foreign exchange and commodity hedges are included within revenues and cost of operations. The effect of the interest rate contracts are included within interest expense. The effect of the Consumer Financing Program is included in other income, net. (In millions) Three months ended June 30, Six months ended June 30, Unrealized mark-to-market results 2023 2022 2023 2022 Reversal of previously recognized unrealized (gains) on settled positions related to economic hedges $ (151) $ (197) $ (997) $ (605) Reversal of acquired loss/(gain) positions related to economic hedges 35 48 10 (12) Net unrealized gains/(losses) on open positions related to economic hedges 180 868 (893) 3,613 Total unrealized mark-to-market gains/(losses) for economic hedging activities 64 719 (1,880) 2,996 Reversal of previously recognized unrealized losses on settled positions related to trading activity 10 8 11 9 Net unrealized gains/(losses) on open positions related to trading activity 3 (10) 14 (25) Total unrealized mark-to-market gains/(losses) for trading activity 13 (2) 25 (16) Total unrealized gains/(losses) - commodities and foreign exchange $ 77 $ 717 $ (1,855) $ 2,980 Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Unrealized gains/(losses) included in revenues - commodities $ 88 $ (150) $ 191 $ (297) Unrealized gains/(losses) included in cost of operations - commodities 5 858 (2,032) 3,272 Unrealized (losses)/gains included in cost of operations - foreign exchange (16) 9 (14) 5 Total impact to statement of operations - commodities and foreign exchange $ 77 $ 717 $ (1,855) $ 2,980 Total impact to statement of operations - consumer financing program $ (3) $ — $ (3) $ — Total impact to statement of operations - interest rate contracts $ 29 $ — $ 24 $ — The reversals of acquired loss/(gain) 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 revenue or cost of operations during the same period. For the six months ended June 30, 2023, the $893 million unrealized loss from open economic hedge positions was primarily the result of a decrease in value of forward positions as a result of decreases in natural gas and power prices in the East and West. For the six months ended June 30, 2022, the $3.6 billion unrealized gain from open economic hedge positions was primarily due to increases in the value of forward positions as a result of increases in natural gas and power prices. Credit Risk Related Contingent Features Certain of the Company's trading agreements contain provisions that entitle the counterparty to demand that the Company post additional collateral if the counterparty determines that there has been deterioration in the Company's 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 potentially required for all contracts with adequate assurance clauses that are in a net liability position as of June 30, 2023 was $743 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 approximately $91 million as of June 30, 2023. In the event of a downgrade in the Company's credit rating and if called for by the counterparty, $15 million of additional collateral would be required for all contracts with credit rating contingent features as of June 30, 2023. See Note 5, Fair Value of Financial Instruments , for discussion regarding concentration of credit risk.

Impairments

Impairments	6 Months Ended
	Jun. 30, 2023
Property, Plant and Equipment [Abstract]
Impairments	Impairments 2022 Impairment Losses PJM Asset Impairments — During the second quarter of 2022, the results of the PJM Base Residual Auction for the 2023/2024 delivery year were released leading the Company to revise its long-term view of certain facilities and announce the planned retirement of the Joliet generating facility in 2023. The Company considered the near-term retirement date of Joliet and the decline in PJM capacity prices to be a trigger for impairment and performed impairment tests on the PJM generating assets and the goodwill associated with Midwest Generation. The Company measured the impairment losses on the PJM generating assets and Midwest Generation goodwill as the difference between the carrying amount and the fair value of the PJM generating assets and Midwest Generation reporting unit, respectively. Fair values were determined using an income approach in which the Company applied a discounted cash flow methodology to the long-term budgets for the plants and reporting unit. Significant inputs impacting the income approach include the Company's long-term view of capacity and fuel prices, projected generation, the physical and economic characteristics of each plant and the reporting unit as a whole, and the discount rate applied to the after-tax cash flow projections. Impairment losses of $20 million and $130 million were recorded in the second quarter of 2022 in the East segment on the PJM generating assets and Midwest Generation goodwill, respectively.

Long-term Debt and Finance Leas

Long-term Debt and Finance Leases	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Long-term Debt and Finance Leases	Long-term Debt and Finance Leases Long-term debt and finance leases consisted of the following: (In millions, except rates) June 30, 2023 December 31, 2022 Interest rate % Recourse debt: Senior Notes, due 2027 $ 375 $ 375 6.625 Senior Notes, due 2028 821 821 5.750 Senior Notes, due 2029 733 733 5.250 Senior Notes, due 2029 500 500 3.375 Senior Notes, due 2031 1,030 1,030 3.625 Senior Notes, due 2032 1,100 1,100 3.875 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 2025 500 500 2.000 Senior Secured First Lien Notes, due 2027 900 900 2.450 Senior Secured First Lien Notes, due 2029 500 500 4.450 Senior Secured First Lien Notes, due 2033 740 — 7.000 Revolving Credit Facility 700 — various Tax-exempt bonds 466 466 1.250 - 4.750 Subtotal recourse debt 9,540 8,100 Non-recourse debt: Vivint Smart Home Senior Secured Notes, due 2027 600 — 6.750 Vivint Smart Home Senior Notes, due 2029 800 — 5.750 Vivint Smart Home Senior Secured Term Loan, due 2028 1,326 — various Subtotal all Vivint Smart Home non-recourse debt 2,726 — Subtotal long-term debt (including current maturities) 12,266 8,100 Finance leases 19 11 various Subtotal long-term debt and finance leases (including current maturities) 12,285 8,111 Less current maturities (1,319) (63) Less debt issuance costs (73) (70) Discounts (156) (2) Total long-term debt and finance leases $ 10,737 $ 7,976 (a) As of the ex-dividend date of July 31, 2023, the Convertible Senior Notes were convertible at a price of $42.17, which is equivalent to a conversion rate of approximately 23.7112 shares of common stock per $1,000 principal amount Recourse Debt Issuance of 2033 Senior Secured First Lien Notes On March 9, 2023, the Company issued $740 million of aggregate principal amount of 7.000% senior secured first lien notes due 2033 (the "2033 Senior Secured First Lien Notes"). The 2033 Senior Secured First Lien Notes are senior secured obligations of NRG and are guaranteed by certain of its subsidiaries that guarantee indebtedness under the Revolving Credit Facility. The 2033 Senior Secured First Lien Notes are secured by a first priority security interest in the same collateral that is pledged for the benefit of the lenders under the Revolving Credit Facility, which collateral consists of a substantial portion of the property and assets owned by the Company and the guarantors. The collateral securing the 2033 Senior Secured First Lien Notes will be released at the Company’s request if the senior unsecured long-term debt securities of the Company are rated investment grade by any two of the three rating agencies, subject to reversion if such rating agencies withdraw such investment grade rating or downgrade such rating below investment grade. Interest is paid semi-annually beginning on September 15, 2023 until the maturity date of March 15, 2033. The proceeds of the 2033 Senior Secured First Lien Notes, along with cash on hand and proceeds from certain other financings, were used to fund the acquisition of Vivint Smart Home. 2048 Convertible Senior Notes As of June 30, 2023, the Convertible Senior Notes were convertible, under certain circumstances, into cash or a combination of cash and the Company’s common stock at a price of $42.57 per common share, which is equivalent to a conversion rate of approximately 23.4925 shares of common stock per $1,000 principal amount of Convertible Senior Notes. The net carrying amounts of the Convertible Senior Notes as of June 30, 2023 and December 31, 2022 were $571 million and $570 million, respectively. The Convertible Senior Notes mature on June 1, 2048, unless earlier repurchased, redeemed or converted in accordance with their terms. The Convertible Senior notes are convertible at the option of the holders under certain circumstances. Prior to the close of business on the business day immediately preceding December 1, 2024, the Convertible Senior Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter during specified periods as follows: • from December 1, 2024 until the close of business on the second scheduled trading day immediately before June 1, 2025; and • from December 1, 2047 until the close of business on the second scheduled trading day immediately before the maturity date The following table details the interest expense recorded in connection with the Convertible Senior Notes, due 2048: Three months ended June 30, Six months ended June 30, ($ In millions) 2023 2022 2023 2022 Contractual interest expense $ 4 $ 4 $ 8 $ 8 Amortization of deferred finance costs — 1 1 1 Total $ 4 $ 5 $ 9 $ 9 Effective Interest Rate 0.75 % 0.76 % 1.52 % 1.52 % Revolving Credit Facility On February 14, 2023, the Company amended its Revolving Credit Facility to: (i) increase the existing revolving commitments thereunder by $600 million, (ii) extend the maturity date of a portion of the revolving commitments thereunder to February 14, 2028, (iii) transition the benchmark rate applicable to revolving loans from LIBOR to SOFR and (iv) make certain other amendments to the terms of the Revolving Credit Facility for purposes of, among other things, providing additional flexibility. For further discussion, see Note 13, Long-term Debt and Finance Leases, of the Company’s 2022 Form 10-K. On March 13, 2023, the Company further amended its Revolving Credit Facility to increase the existing revolving commitments by an additional $45 million. As of June 30, 2023, there were outstanding borrowings of $700 million and there were $823 million in letters of credit issued under the Revolving Credit Facility. As of July 31, 2023, there were outstanding borrowings of $700 million and $879 million in letters of credit issued under the Revolving Credit Facility. Bilateral Letter of Credit Facilities On May 19, 2023 and May 30, 2023, the Company increased the size of its bilateral letter of credit facilities by $25 million and $100 million, respectively, to provide additional liquidity and to allow for the issuance of up to $800 million of letters of credit. These facilities are uncommitted. As of June 30, 2023, $589 million was issued under these facilities. Receivables Securitization Facilities On June 22, 2023, NRG Receivables LLC (“NRG Receivables”), an indirect wholly-owned subsidiary of the Company, amended its existing Receivables Facility to, among other things, (i) extend the scheduled termination date to June 21, 2024, (ii) increase the aggregate commitments from $1.0 billion to $1.4 billion (adjusted seasonally) and (iii) add a new originator. As of June 30, 2023, there were no outstanding borrowings and there were $842 million in letters of credit issued. In addition, in connection with the amendments to the Receivables Facility, on June 22, 2023, the Company and the originators thereunder renewed the existing uncommitted Repurchase Facility. Such renewal, among other things, extended the maturity date to June 21, 2024 and joined an additional originator to the Repurchase Facility. As of June 30, 2023, there were no outstanding borrowings. For further information on the above facilities, see Note 13, Long-term Debt and Finance Leases , of the Company's 2022 Form 10-K. Dunkirk Bonds On April 3, 2023, NRG remarketed $59 million in aggregate principal amount of 4.25% tax-exempt refinancing bonds of the Chautauqua County Capital Resource Corporation (the "Dunkirk Bonds"). The Dunkirk Bonds are guaranteed on a first-priority basis by each of NRG's current and future subsidiaries that guarantee indebtedness under the Revolving Credit Facility. The Dunkirk Bonds are secured by a first priority security interest in the same collateral that is pledged for the benefit of the lenders under the Revolving Credit Facility, which consists of a substantial portion of the property and assets owned by NRG and the guarantors. The collateral securing the Dunkirk 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 Dunkirk Bonds or any of NRG's senior, unsecured debt securities or downgrade such ratings below investment grade. The Dunkirk Bonds are subject to mandatory tender and purchase on April 3, 2028 and have a final maturity date of April 1, 2042. Non-recourse Debt The following are descriptions of certain indebtedness of NRG's subsidiaries. All of NRG's non-recourse debt is secured by the assets in the subsidiaries as further described below. Acquired Vivint Smart Home Debt On March 10, 2023, in connection with the Vivint Smart Home acquisition, Vivint Smart Home's indirect wholly owned subsidiary, APX Group, Inc. ("APX"), retained its 6.750% senior secured notes due 2027, 5.750% senior notes due 2029, senior secured term loan credit agreement and senior secured revolving credit facility. Vivint Smart Home 2027 Senior Secured Notes Vivint Smart Home has outstanding $600 million aggregate principal amount of 6.750% senior secured notes due 2027 (the "Vivint Smart Home 2027 Senior Secured Notes"). The Vivint Smart Home 2027 Senior Secured Notes are senior secured obligations of APX and are guaranteed by APX Group Holdings, Inc., each of APX's existing and future wholly owned U.S. restricted subsidiaries (subject to customary exclusions and qualifications) and Vivint Smart Home. Interest on the Vivint Smart Home 2027 Senior Secured Notes is paid semi-annually in arrears on February 15 and August 15 until the maturity date of February 15, 2027. Vivint Smart Home 2029 Senior Notes Vivint Smart Home has outstanding $800 million aggregate principal amount of 5.750% senior notes due 2029 (the "Vivint Smart Home 2029 Senior Notes"). The Vivint Smart Home 2029 Senior Notes are senior unsecured obligations of APX and are guaranteed by APX Group Holdings, Inc., each of APX's existing and future wholly owned U.S. restricted subsidiaries (subject to customary exclusions and qualifications) and Vivint Smart Home. Interest on the Vivint Smart Home 2029 Senior Notes is paid semi-annually in arrears on January 15 and July 15 until the maturity date of July 15, 2029. Vivint Smart Home Senior Secured Credit Facilities The Vivint Smart Home senior secured credit agreement (the “Vivint Smart Home Credit Agreement”) provides for (i) a term loan facility in an aggregate principal amount of $1.4 billion (the “Vivint Smart Home Term Loan Facility”, and the loans thereunder, the “Vivint Smart Home Term Loans”) and (ii) a revolving credit facility in an aggregate principal amount of $370 million (the “Vivint Smart Home Revolving Credit Facility,” and the loans thereunder, the “Vivint Smart Home Revolving Loans”). All of APX’s obligations under the Vivint Smart Home Credit Agreement are guaranteed by APX Group Holdings, Inc. and each of APX’s existing and future wholly-owned U.S. restricted subsidiaries (subject to customary exclusions and qualifications). The obligations under the Vivint Smart Home Credit Agreement are secured by a first priority perfected security interest in (1) substantially all of the present and future tangible and intangible assets of APX, and the guarantors, including without limitation equipment, subscriber contracts and communication paths, intellectual property, general intangibles, investment property, material intercompany notes and proceeds of the foregoing, subject to permitted liens and other customary exceptions, (2) substantially all personal property of APX and the guarantors consisting of accounts receivable arising from the sale of inventory and other goods and services (including related contracts and contract rights, inventory, cash, deposit accounts, other bank accounts and securities accounts), inventory and intangible assets to the extent attached to the foregoing books and records of APX and the guarantors, and the proceeds thereof, subject to permitted liens and other customary exceptions, in each case held by APX and the guarantors and (3) a pledge of all of the capital stock of APX, each of its subsidiary guarantors and each restricted subsidiary of APX and its subsidiary guarantors, in each case other than certain excluded assets and subject to the limitations and exclusions provided in the applicable collateral documents. The Vivint Smart Home Credit Agreement contains customary covenants, which, among other things, require APX to maintain a maximum first lien net leverage ratio when amounts outstanding under the Vivint Smart Home Revolving Facility exceed a certain threshold and restrict, subject to certain exceptions, APX and its restricted subsidiaries’ ability to: • incur or guarantee additional debt or issue disqualified stock or preferred stock; • pay dividends and make other distributions on, or redeem or repurchase, capital stock; • make certain investments; • incur certain liens; • enter into transactions with affiliates; • merge or consolidate; • materially change the nature of their business; • enter into agreements that restrict the ability of restricted subsidiaries to make dividends or other payments to APX or grant liens on their assets; • designate restricted subsidiaries as unrestricted subsidiaries; • amend, prepay, redeem or purchase certain material contractually subordinated debt; and • transfer or sell certain assets. On June 9, 2023, Vivint Smart Home entered into an amendment to the Vivint Smart Home Credit Agreement which transitioned the benchmark rate applicable to the Vivint Smart Home Term Loans and the Vivint Smart Home Revolving Loans from LIBOR to SOFR. As of June 30, 2023, the aggregate outstanding principal amount of the Vivint Term Loans was $1.3 billion. As of June 30, 2023, Vivint Smart Home had $10 million in letters of credit issued under the Vivint Smart Home Revolving Credit Facility and no outstanding borrowings.

Investments Accounted for Using

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs	6 Months Ended
	Jun. 30, 2023
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 and movements in foreign currency exchange rates. During 2022, the equity method of accounting for Ivanpah was suspended based on losses generated by the project, including the impact of debt service and depreciation. Variable Interest Entities that are Consolidated The Company has a controlling financial interest that has been identified as a VIE under ASC 810 in NRG Receivables LLC, which has entered into financing transactions related to the Receivables Facility as further described in Note 13, Long-term Debt and Finance Leases, to the Company’s 2022 Form 10-K. The summarized financial information for the Company's consolidated VIE consisted of the following: (In millions) June 30, 2023 December 31, 2022 Accounts receivable and Other current assets $ 1,256 $ 2,108 Current liabilities 152 152 Net assets $ 1,104 $ 1,956

Changes in Capital Structure

Changes in Capital Structure	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Changes in Capital Structure	Changes in Capital Structure As of June 30, 2023 and December 31, 2022, the Company had 10,000,000 shares of preferred stock authorized and 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's preferred and common stock issued and outstanding: Preferred Common Issued and Outstanding Issued Treasury Outstanding Balance as of December 31, 2022 — 423,897,001 (194,335,971) 229,561,030 Shares issued under LTIPs — 778,213 — 778,213 Shares issued under ESPP — — 86,516 86,516 Issuance of Series A Preferred Stock 650,000 — — — Balance as of June 30, 2023 650,000 424,675,214 (194,249,455) 230,425,759 Shares issued under LTIPs — 13,812 — 13,812 Shares repurchased — — (1,322,141) (1,322,141) Balance as of July 31, 2023 650,000 424,689,026 (195,571,596) 229,117,430 Common Stock Share Repurchases In June 2023, NRG revised its long-term capital allocation policy to target allocating approximately 80% of cash available for allocation, after debt reduction, to be returned to shareholders. As part of the revised capital allocation framework, the Company announced an increase to its share repurchase authorization to $2.7 billion, to be executed through 2025. During July 2023, the Company purchased 1,322,141 shares for $50 million at an average price of $37.82 under the $2.7 billion authorization. Employee Stock Purchase Plan The Company offers 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 90% of its market value on the offering date or 90% of the fair market value on the exercise date. An offering date occurs each April 1 and October 1. An exercise date occurs each September 30 and March 31. On April 27, 2023, NRG stockholders approved the adoption of the Amended and Restated Employee Stock Purchase Plan, effective April 1, 2023, which included a reduction in the price at which eligible employees may purchase shares of NRG common stock from 95% to 90% of the fair market value of the shares on the applicable date. NRG stockholders also approved an increase of 4,400,000 shares available for the issuance under the ESPP. NRG Common Stock Dividends During the first quarter of 2023, NRG increased the annual dividend to $1.51 from $1.40 per share and expects to target an annual dividend growth rate of 7%-9% per share in subsequent years. A quarterly dividend of $0.3775 per share was paid on the Company's common stock during the three months ended June 30, 2023. On July 17, 2023, NRG declared a quarterly dividend on the Company's common stock of $0.3775 per share, payable on August 15, 2023 to stockholders of record as of August 1, 2023. The Company's common stock dividends are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations. Preferred Stock Series A Preferred Stock On March 9, 2023, the Company issued 650,000 shares of 10.25% Series A Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock ("Series A Preferred Stock"). The net proceeds of $635 million, net of issuance costs, were used to partially fund the Vivint Smart Home acquisition. The Series A Preferred Stock is not convertible into or exchangeable for any other securities or property and has limited voting rights. The Series A Preferred Stock may be redeemed, in whole or in part, on one or more occasions, at the option of the Company at any time after March 15, 2028 ("Series A First Reset Date") and in certain other circumstances prior to the Series A First Reset Date.

Income_(Loss) Per Share

Income/(Loss) Per Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Income/(Loss) Per Share	Income/(Loss) Per Share Basic income/(loss) per common share is computed by dividing net income/(loss) less cumulative dividends attributable to preferred stock by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the period are weighted for the portion of the period that they were outstanding. Diluted income/(loss) per share is computed in a manner consistent with that of basic income/(loss) per share while giving effect to all potentially dilutive common shares that were outstanding during the period when there is net income. The relative performance stock units, non-vested restricted stock units, and non-qualified stock options are not considered outstanding for purposes of computing basic income/(loss) per share. However, these instruments are included in the denominator for purposes of computing diluted income per share under the treasury stock method for periods when there is net income. The Convertible Senior Notes are convertible, under certain circumstances, into cash or combination of cash and Company’s common stock. The Company is including the potential share settlements, if any, in the denominator for purposes of computing diluted income per share under the if converted method for periods when there is net income. The potential shares settlements are calculated as the excess of the Company's conversion obligation over the aggregate principal amount (which will be settled in cash), divided by the average share price for the period. For the three and six months ended June 30, 2023 and 2022, there was no dilutive effect for the Convertible Senior Notes since there were no potential share settlements for the periods. NRG's basic and diluted income/(loss) per share is shown in the following table: Three months ended June 30, Six months ended June 30, (In millions, except per share data) 2023 2022 2023 2022 Basic income/(loss) per share: Net income/(loss) $ 308 $ 513 $ (1,027) $ 2,249 Less: Cumulative dividends attributable to Series A Preferred Stock 17 — 21 — Net income/(loss) available for common stockholders $ 291 $ 513 $ (1,048) $ 2,249 Weighted average number of common shares outstanding - basic 231 237 230 240 Income/(loss) per weighted average common share — basic $ 1.26 $ 2.16 $ (4.56) $ 9.37 Diluted income/(loss) per share: Net income/(loss) $ 308 $ 513 $ (1,027) $ 2,249 Less: Cumulative dividends attributable to Series A Preferred Stock 17 — 21 — Net income/(loss) available for common stockholders $ 291 $ 513 $ (1,048) $ 2,249 Weighted average number of common shares outstanding - basic 231 237 230 240 Incremental shares attributable to the issuance of equity compensation (treasury stock method) 1 — — — Weighted average number of common shares outstanding - dilutive 232 237 230 240 Income/(loss) per weighted average common share — diluted $ 1.25 $ 2.16 $ (4.56) $ 9.37 The following table summarizes the Company's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted income/(loss) per share: Three months ended June 30, Six months ended June 30, (In millions of shares) 2023 2022 2023 2022 Equity compensation plans 1 — 7 —

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. The Company manages its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus. The acquired operations from the Vivint Smart Home acquisition are reported within the Vivint Smart Home segment. NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of the Company's 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). The accounting policies of the segments are the same as those applied in the consolidated financial statements as disclosed in Note 2, Summary of Significant Accounting Policies , to the Company’s 2022 Form 10-K. Three months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 2,515 $ 2,503 $ 892 $ 444 $ — $ (6) $ 6,348 Depreciation and amortization 73 30 23 180 9 — 315 Gain on sale of assets — 3 — — — — 3 Equity in earnings of unconsolidated affiliates — — 5 — — — 5 Income/(loss) before income taxes 785 (100) (128) (23) (137) — 397 Net income/(loss) $ 785 $ (101) $ (129) $ (23) $ (224) $ — $ 308 Three months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate Eliminations Total Revenue $ 2,692 $ 3,514 $ 1,076 $ — $ — $ 7,282 Depreciation and amortization 77 50 22 8 — 157 Impairment losses — 155 — — — 155 (Loss)/gain on sale of assets (12) — 44 — — 32 Equity in earnings of unconsolidated affiliates — — 4 — — 4 Income/(loss) before income taxes 762 (13) 35 (119) — 665 Net income/(loss) $ 762 $ (12) $ 24 $ (261) $ — $ 513 Six months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate Eliminations Total Revenue $ 4,549 $ 6,679 $ 2,266 $ 592 $ — $ (16) $ 14,070 Depreciation and amortization 148 60 47 232 18 — 505 Gain on sale of assets — 202 — — — — 202 Equity in earnings of unconsolidated affiliates — — 10 — — — 10 Income/(loss) before income taxes 1,069 (1,502) (479) (62) (300) — (1,274) Net income/(loss) $ 1,069 $ (1,503) $ (433) $ (62) $ (98) $ — $ (1,027) (a) Includes results of operations following the acquisition date of March 10, 2023 Six months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate Eliminations Total Revenue $ 4,712 $ 8,229 $ 2,220 $ — $ 17 $ 15,178 Depreciation and amortization 154 127 43 16 — 340 Impairment losses — 155 — — — 155 (Loss)/gain on sale of assets (12) — 43 (2) — 29 Equity in losses of unconsolidated affiliates (1) — (10) — — (11) Income/(loss) before income taxes 1,533 1,525 164 (250) — 2,972 Net income/(loss) $ 1,533 $ 1,526 $ 154 $ (964) $ — $ 2,249

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2023
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) 2023 2022 2023 2022 Income/(Loss) before income taxes $ 397 $ 665 $ (1,274) $ 2,972 Income tax expense/(benefit) 89 152 (247) 723 Effective income tax rate 22.4 % 22.9 % 19.4 % 24.3 % For the six months ended June 30, 2023, the effective tax rate was lower than the statutory rate of 21%, primarily due to current state tax expense which has an inverted effect and reduces the effective tax rate when applied to year-to-date financial statement losses. For the three months ended June 30, 2023, the effective tax rate was higher than the statutory rate of 21% primarily due to state tax expense. For the three and six months ended June 30, 2022, the effective tax rate was higher than the statutory rate of 21% primarily due to state tax expense partially offset by tax benefit resulting from the release of valuation allowance on state net operating losses. The Inflation Reduction Act ("IRA") enacted on August 16, 2022, introduced new provisions including a 15% corporate book minimum tax and a 1% excise tax on net share repurchases with both taxes effective beginning in fiscal year 2023 for NRG. The Company will continue to evaluate the impact of the corporate book minimum tax when the U.S. Treasury and the IRS release further guidance. Additionally, the IRA establishes a tax credit associated with existing nuclear facilities which begins in 2024 and terminates at the end of 2031. The production tax credit will fully apply when gross revenues are at or below $25 per MWh and phases out completely at $43.75 per MWh. The U.S. Treasury is in the process of defining the methods by which gross revenues may be calculated pursuant to the IRA. Uncertain Tax Benefits As of June 30, 2023, NRG had a non-current tax liability of $45 million for uncertain tax benefits from positions taken on various federal and state income tax returns inclusive of accrued interest. For the six months ended June 30, 2023, NRG accrued an immaterial amount of interest relating to the uncertain tax benefits. As of June 30, 2023, 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 2019. With few exceptions, state and Canadian income tax examinations are no longer open for years prior to 2014.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions NRG provides services to some of its related parties, who are accounted for as 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) 2023 2022 2023 2022 Revenues from Related Parties Included in Revenue Gladstone $ — $ — $ 1 $ 1 Ivanpah (a) 21 9 55 22 Midway-Sunset 1 1 2 3 Total $ 22 $ 10 $ 58 $ 26 (a) Also includes fees under project management agreements with each project company

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2023
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 hedges. To the extent that the underlying hedge positions for a counterparty are out-of-the-money to NRG, the counterparty would have a claim under the first lien program. As of June 30, 2023, hedges under the first lien program were out-of-the-money for NRG on a counterparty aggregate basis. 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. Environmental Lawsuits 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 in an interim order 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. During the second quarter of 2023, the IPCB held hearings regarding the appropriate relief. Midwest Generation has been working with the Illinois EPA to address the groundwater issues since 2010. Consumer Lawsuits Similar to other energy service companies (“ESCOs”) operating in the industry, from time-to-time, the Company and/or its subsidiaries may be subject to consumer lawsuits in various jurisdictions where they sell natural gas and electricity. Variable Price Cases — In the cases set forth below, referred to as the Variable Price Cases, such actions involve consumers alleging that one of the Company’s ESCOs promised that consumers would pay the same or less than they would have paid if they stayed with their default utility or previous energy supplier. The underlying claims of each case are similar and the Company continues to deny the allegations and is vigorously defending these matters. These matters were known and accrued for at the time of each acquisition. XOOM Energy Mirkin v. XOOM Energy (E.D.N.Y. Aug. 2019) is a defendant in a putative class action lawsuit pending in New York. Summary judgment is fully briefed. XOOM is waiting for a ruling from the trial court. Direct Energy There are two putative class actions pending against Direct Energy: (1) Richard Schafer v. Direct Energy (W.D.N.Y. Dec. 2019; on appeal 2 nd Cir. N.Y.) - The Second Circuit sent the matter back to the trial court in December 2021. After discovery, Direct Energy filed summary judgment. Direct Energy won summary judgment and Schafer appealed. The appeal is fully briefed. Oral argument has not been set. Given the result of Martin Forte v. Direct Energy (N.D.N.Y. Mar. 2017), the trial court's summary judgment will be upheld and Direct Energy is expected to prevail; and (2) Andrew Gant v. Direct Energy and NRG (D.N.J. Aug. 2022) - Direct Energy and NRG filed a Motion to Dismiss on October 18, 2022. Telephone Consumer Protection Act ("TCPA") Cases — In the cases set forth below, referred to as the TCPA Cases, such actions involve consumers alleging violations of the Telephone Consumer Protection Act of 1991, as amended, by receiving calls, texts or voicemails without consent in violation of the federal Telemarketing Sales Rule, and/or state counterpart legislation. The underlying claims of each case are similar. The Company denies the allegations asserted by plaintiffs and intends to vigorously defend these matters. These matters were known and accrued for at the time of the acquisition. There are two putative class actions pending against Direct Energy: (1) Holly Newman v. Direct Energy, LP (D. Md Sept 2021) - Direct Energy filed its Motion to Dismiss asserting the ruling in the Brittany Burk v. Direct Energy (S.D. Tex. Feb 2019) preempts the Plaintiff's ability to file suit based on the same facts. The Court denied Direct Energy's motion stating the Court does not have the benefit of all of the facts that were in front of the Burk court to issue a similar ruling. On October 19, 2022, Direct Energy filed a Motion to Transfer Venue asking the Court to transfer the case to the Southern District where the Burk case was filed. On April 12, 2023, the Court granted Direct Energy’s Motion to Transfer Venue, moving to the case to the Southern District of Texas; and (2) Matthew Dickson v. Direct Energy (N.D. Ohio Jan. 2018) - The case was stayed pending the outcome of an appeal to the Sixth Circuit based on the unconstitutionality of the TCPA during the period from 2015-2020. The Sixth Circuit found the TCPA was in effect during that period and remanded the case back to the trial court. Direct Energy refiled its motions along with supplements. On March 25, 2022, the Court granted summary judgment in favor of Direct Energy and dismissed the case. Dickson appealed. The Sixth Circuit found that Dickson has standing and reversed the trial court's dismissal of the case. The case will go back to the trial court where Direct Energy will seek a stay to file a petition for review by the U.S. Supreme Court. Sales Practice Lawsuits There are three litigation matters relating to claims made by Vivint Smart Home competitors against Vivint Smart Home alleging, among other things, that Vivint Smart Home's sales representatives used deceptive sales practices. Vivint Smart Home intends to vigorously defend these matters. These matters were known and accrued for at the time of the acquisition. The three matters are: (1) CPI Security Systems, Inc. ("CPI") v. Vivint Smart Home, Inc. (W.D.N.C. Sept. 2020). The CPI matter that was filed in 2020 went to trial, and in February 2023, the jury issued a verdict against Vivint Smart Home, in favor of CPI for $50 million of compensatory damages and an additional $140 million of punitive damages. Vivint Smart Home filed its post-trial motion in March 2023 and continues to evaluate its post-trial and appeal options. While Vivint Smart Home believes the CPI jury verdict is not legally or factually supported and intends to pursue post judgment remedies and file an appeal, there can be no assurance that such defense efforts will be successful; (2) ADT LLC, et al. ("ADT") v. Vivint Smart Home, Inc. f/k/a Mosaic Acquisition Corporation, et al.(S.D.Fl. Aug. 2020). The parties mediated in May 2023 and agreed on a settlement. In June 2023, the Court granted final approval of the settlement, which was paid in June 2023; and (3) Alert 360 Opco, Inc, et al. ("Alert 360") v. Vivint Smart Home, Inc., et al (N.D.Ok. March 2023). On March 1, 2023, Alert 360 filed a complaint against Vivint Smart Home alleging, among other things, deceptive sales practices. Contract Disputes Alarm.com — In September 2022, Vivint Smart Home sent Alarm.com a notice asserting that it was no longer obligated to pay certain license fees under the Patent Cross License Agreement between the parties on the basis that Vivint Smart Home no longer practices any claim under any valid Alarm.com patent and, therefore, no license fees are due. Alarm.com filed an arbitration demand against Vivint Smart Home alleging, among other things, breach of the agreement due to continued use of the patents in question. The arbitration panel recently determined that Vivint Smart Home's challenge to the validity of certain Alarm.com patents will be considered as part of the arbitration proceeding. STP — In July 2023, the partners in STP, CPS and Austin Energy, initiated a lawsuit and filed to intervene in the license transfer application with the NRC, claiming a right of first refusal exists in relation to the proposed sale of NRG South Texas' 44% interest in STP to Constellation. NRG believes the claims set forth by CPS and Austin Energy in the lawsuit and the NRC proceedings are without merit and intends to vigorously defend against them. For further discussion of the transaction, see Note 4, Acquisitions and Dispositions. Winter Storm Uri Lawsuits The Company has been named in certain property damage and wrongful death claims that have been filed in connection with Winter Storm Uri in its capacity as a generator and a REP. Most of the lawsuits related to Winter Storm Uri are consolidated into a single multi-district litigation matter in Harris County District Court. NRG's REPs have since been severed from the multi-district litigation and will be seeking dismissal in any remaining cases. As a power generator, the Company is named in various cases with claims ranging from: wrongful death; personal injury only; property damage and personal injury; property damage only; and subrogation. The case is currently stayed pending appeal by other parties on other issues. The Company intends to vigorously defend these matters. Indemnifications and Other Contractual Arrangements 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 federal court dismissed this lawsuit without prejudice for lack of subject matter jurisdiction. 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 with this litigation.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2023
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, state and provincial agencies. As such, NRG is affected by regulatory developments at the federal, state and provincial 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 wholesale and retail operations. In addition to the regulatory proceeding 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.

Environmental Matters

Environmental Matters	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Environmental Matters	Environmental Matters NRG is subject to a wide range of environmental laws in the development, construction, ownership and operation of power plants. These laws generally require that governmental permits and approvals be obtained before construction and maintained during operation of power plants. The electric generation industry has been facing increasingly stringent requirements regarding air quality, GHG emissions, combustion byproducts, water discharge and use, and threatened and endangered species. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose additional 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. The Company has elected to use a $1 million disclosure threshold, as permitted, for environmental proceedings to which the government is a party. Air CPP/ACE Rules — On July 8, 2019, the 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 required states that have coal-fired EGUs to develop plans to seek heat rate improvements from coal-fired EGUs. On January 19, 2021, the D.C. Circuit vacated the ACE rule (but on February 22, 2021, at the EPA's request, stayed the issuance of the portion of the mandate that would vacate the repeal of the CPP). On June 30, 2022, the U.S. Supreme Court held that the "generation shifting" approach in the CPP exceeded the powers granted to the EPA by Congress. The Court did not address the related issues of whether the EPA may adopt only measures applied at each source. On May 23, 2023, the EPA proposed significantly revising the manner in which new and existing EGU's GHG emissions should be regulated including using hydrogen as a fuel, capturing and storing/sequestering CO 2 and requiring new units to be more efficient. The EPA has stated that it intends to finalize these revisions in 2024. The Company expects that the final rule will be challenged in the courts and accordingly uncertain for several years. Cross-State Air Pollution Rule ("CSAPR") — On March 15, 2023, the EPA signed and released a prepublication of a final rule that sought to significantly revise the CSAPR to address the good-neighbor obligations of the 2015 ozone NAAQS for 23 states after earlier having disapproved numerous state plans to address the issue. Several states, including Texas, challenged the EPA's disapproval of their state plans. On May 1, 2023, the United States Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of Texas' and Louisiana's state plans, which disapprovals are a condition precedent to the EPA imposing its plan on Texas and Louisiana. Several other states are also similarly situated because of similar stays. Nonetheless, on June 5, 2023, the EPA published this rule in the Federal Register. On July 31, 2023, the EPA promulgated an interim final rule that addresses the various judicial orders that have stayed several State-Implementation-Plan disapprovals by limiting the effectiveness of certain requirements of the final rule promulgated on June 5, 2023 in Texas and five other states. The final rule decreases, over time, the ozone-season NOx allowances allocated to generators in the states not affected by the judicial stays beginning this summer by assuming that participants in this cap-and-trade program had or would optimize existing NOx controls and later install additional NOx controls. The Company cannot predict the outcome of the legal challenges to the: (i) various state disapprovals; (ii) the final rule promulgated on June 5, 2023; and (iii) the interim final rule promulgated on July 31, 2023 that seeks to address the judicial orders. Regional Haze Proposal — On May 2023, the EPA proposed to withdraw the existing Texas Sulfur Dioxide Trading Program and replace it with unit-specific SO 2 limits for 12 units in Texas to address requirements to improve visibility at National Parks and Wilderness areas. If finalized as proposed, it would result in more stringent SO 2 limits for two of the Company's coal-fired units in Texas. The Company cannot predict the outcome of this proposal. Water Effluent Limitations Guidelines — In November 2015, the EPA revised the Effluent Limitations Guidelines ("ELG") for Steam Electric Generating Facilities, which 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, postponed 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 amended the rule. On October 13, 2020, the EPA amended the 2015 ELG rule by: (i) altering the stringency of certain limits for FGD wastewater; (ii) relaxing the zero-discharge requirement for bottom ash transport water; and (iii) changing several deadlines. In 2021, the EPA announced that it was initiating a new rulemaking to evaluate revising the ELG rule but keeping the existing rule (as amended in 2020) in place. On March 29, 2023, the EPA proposed revisions to the ELG and sought comments on the proposal, which the EPA are currently analyzing. In October 2021, NRG informed its regulators that the Company intends to comply with the ELG by ceasing combustion of coal by the end of 2028 at its domestic coal units outside of Texas, and installing appropriate controls by the end of 2025 at its two plants that have coal-fired units in Texas. 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. On July 30, 2018, the EPA promulgated a rule that amended the 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 surface impoundments. On August 28, 2020, the EPA finalized "A Holistic Approach to Close Part A: Deadline to Initiate Closure," which amended the April 2015 Rule to address the August 2018 D.C. Circuit decision and extend some of the deadlines. On November 12, 2020, the EPA finalized "A Holistic Approach to Closure Part B," which further amended the April 2015 Rule to, among other things, provide procedures for requesting approval to operate existing impoundments with an alternative liner. On May 23, 2023, the EPA proposed establishing requirements for: (i) inactive (or legacy) surface impoundments at inactive facilities and (ii) all coal combustion residual ("CCR") management units (regardless of how or when the CCR was placed) at regulated facilities. The EPA also solicited comments on this proposal. NRG anticipates further rulemaking related to the Federal Permit Program and legacy surface impoundments.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 308	$ 513	$ (1,027)	$ 2,249

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
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	ReclassificationsCertain prior period amounts have been reclassified for comparative purposes. The reclassifications did not affect consolidated results from operations, net assets or consolidated cash flows
Vivint Flex Pay and Capitalized Contract Costs	Flex PayUnder the Flex Pay plan (“Flex Pay”), offered by Vivint Smart Home, subscribers pay separately for smart home products and smart home and security services. The subscriber has the ability to pay for Vivint Smart Home products in the following three ways: (i) qualified subscribers may finance the purchase through third-party financing providers ("Consumer Financing Program" or “CFP”), (ii) Vivint Smart Home generally offers a limited number of subscribers not eligible for the CFP, but who qualify under Vivint Smart Home underwriting criteria, the option to enter into a retail installment contract directly with Vivint Smart Home or (iii) subscribers may conduct purchases by check, automatic clearing house payments, credit or debit card or by obtaining short term financing (generally no more than six-month installment terms) through Vivint Smart Home. Although subscribers pay separately for products and services under Flex Pay, the Company has determined that the sale of products and services are one single performance obligation resulting in deferred revenue for the gross amount of products sold. For products financed through the CFP, gross deferred revenues are reduced by (i) any fees the third-party financing provider (“Financing Provider”) is contractually entitled to receive at the time of loan origination, and (ii) the present value of expected future payments due to the Financing Providers . Loans are issued on either an installment or revolving basis with repayment terms ranging from 6 to 60 months. For certain Financing Provider loans: • Vivint Smart Home pays a monthly fee based on either the average daily outstanding balance of the installment loans, or the number of outstanding loans. • Vivint Smart Home incurs fees at the time of the loan origination and receives proceeds that are net of these fees. • Vivint Smart Home also shares liability for credit losses, with Vivint Smart Home being responsible for between 2.6% and 100% of lost principal balances. Due to the nature of these provisions, the Company records a derivative liability at its fair value when the Financing Provider originates loans to subscribers, which reduces the amount of estimated revenue recognized on the provision of the services. The derivative liability is reduced as payments are made by Vivint Smart Home to the Financing Provider. Subsequent changes to the fair value of the derivative liability are realized through other income, net in the consolidated statements of operations. For further discussion, see Note 7, Accounting for Derivative Instruments and Hedging Activities . Capitalized Contract Costs Capitalized contract costs represent the costs directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts. These costs include installed products, commissions, other compensation and cost of installation of new or upgraded customer contracts. The Company calculates amortization by accumulating all deferred contract costs into separate portfolios based on the initial month of service and amortizes those deferred contract costs on a straight-line basis over the expected period of benefit, consistent with the pattern in which the Company provides services to its customers. The expected period of benefit for customers is approximately five years. The Company updates its estimate of the period of benefit periodically and whenever events or circumstances indicate that the period of benefit could change significantly. Such changes, if any, are accounted for prospectively as a change in estimate. Amortization of capitalized contract costs are included in cost of operations and selling, general and administrative costs on the consolidated statements of operations. Contract costs not directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts are expensed as incurred. Vivint Smart Home Retail Revenue Vivint Smart Home offers its subscribers combinations of smart home products and services, which together create an integrated smart home system that allows the Company's subscribers to monitor, control and protect their homes. As the products and services included in the subscriber's contract are integrated and highly interdependent, and because the products (including installation) and services must work together to deliver the monitoring, controlling and protection of their home, the Company has concluded that the products and services contracted for by the subscriber are generally not distinct within the context of the contract and, therefore, constitute a single, combined performance obligation. Revenues for this single, combined performance obligation are recognized on a straight-line basis over the subscriber's contract term, which is the period in which the parties to the contract have enforceable rights and obligations. The Company has determined that certain contracts that do not require a long-term commitment for monitoring services by the subscriber contain a material right to renew the contract, because the subscriber does not have to purchase the products upon renewal. Proceeds allocated to the material right are recognized over the period of the benefit. The majority of Vivint Smart Home's subscription contracts are five years and are generally non-cancelable. These contracts generally convert into month-to-month agreements at the end of the initial term, while some subscribers are month-to-month from inception. Payment for Vivint Smart Home services is generally due in advance on a monthly basis. Product sales and other one-time fees are invoiced to subscribers at time of sale. Revenues for any products or services that are considered separate performance obligations are recognized upon delivery. Payments received or billed in advance are reported as deferred revenues.
Credit Losses	Credit Losses Retail trade receivables are reported on the balance sheet net of the allowance for credit losses within accounts receivables, net. Long-term receivables are recorded net in other non-current assets in the consolidated balance sheets. The Company accrues a provision 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.
Funds Deposited by Counterparties and Restricted Cash	Funds deposited by counterparties consist of cash held by the Company as a result of collateral posting obligations from its counterparties related to NRG's hedging program. The decrease in funds deposited by counterparties is driven by the significant decrease in forward positions as a result of decreases in natural gas and power prices compared to December 31, 2022. Though some amounts are segregated into separate accounts, not all funds are contractually restricted. Based on the Company's intention, these funds are not available for the payment of general corporate obligations; however, they are available for liquidity management. Depending on market fluctuations and the settlement of the underlying contracts, the Company will refund this collateral to the 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 to satisfy the requirements of certain financing agreements and funds held within the Company's projects that are restricted in their uses.
Recent Accounting Developments	Recent Accounting Developments - Guidance Adopted in 2023 ASU 2021-08 — In October 2021, the FASB issued ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , or ASU 2021-08, which requires that an entity recognize and measure contract assets and contract liabilities acquired in a business combination as if it had originated the contracts in accordance with ASC 606, Revenue from Contracts with Customers. As a result, an acquirer should recognize and
Retail Revenue	Flex PayUnder the Flex Pay plan (“Flex Pay”), offered by Vivint Smart Home, subscribers pay separately for smart home products and smart home and security services. The subscriber has the ability to pay for Vivint Smart Home products in the following three ways: (i) qualified subscribers may finance the purchase through third-party financing providers ("Consumer Financing Program" or “CFP”), (ii) Vivint Smart Home generally offers a limited number of subscribers not eligible for the CFP, but who qualify under Vivint Smart Home underwriting criteria, the option to enter into a retail installment contract directly with Vivint Smart Home or (iii) subscribers may conduct purchases by check, automatic clearing house payments, credit or debit card or by obtaining short term financing (generally no more than six-month installment terms) through Vivint Smart Home. Although subscribers pay separately for products and services under Flex Pay, the Company has determined that the sale of products and services are one single performance obligation resulting in deferred revenue for the gross amount of products sold. For products financed through the CFP, gross deferred revenues are reduced by (i) any fees the third-party financing provider (“Financing Provider”) is contractually entitled to receive at the time of loan origination, and (ii) the present value of expected future payments due to the Financing Providers . Loans are issued on either an installment or revolving basis with repayment terms ranging from 6 to 60 months. For certain Financing Provider loans: • Vivint Smart Home pays a monthly fee based on either the average daily outstanding balance of the installment loans, or the number of outstanding loans. • Vivint Smart Home incurs fees at the time of the loan origination and receives proceeds that are net of these fees. • Vivint Smart Home also shares liability for credit losses, with Vivint Smart Home being responsible for between 2.6% and 100% of lost principal balances. Due to the nature of these provisions, the Company records a derivative liability at its fair value when the Financing Provider originates loans to subscribers, which reduces the amount of estimated revenue recognized on the provision of the services. The derivative liability is reduced as payments are made by Vivint Smart Home to the Financing Provider. Subsequent changes to the fair value of the derivative liability are realized through other income, net in the consolidated statements of operations. For further discussion, see Note 7, Accounting for Derivative Instruments and Hedging Activities . Capitalized Contract Costs Capitalized contract costs represent the costs directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts. These costs include installed products, commissions, other compensation and cost of installation of new or upgraded customer contracts. The Company calculates amortization by accumulating all deferred contract costs into separate portfolios based on the initial month of service and amortizes those deferred contract costs on a straight-line basis over the expected period of benefit, consistent with the pattern in which the Company provides services to its customers. The expected period of benefit for customers is approximately five years. The Company updates its estimate of the period of benefit periodically and whenever events or circumstances indicate that the period of benefit could change significantly. Such changes, if any, are accounted for prospectively as a change in estimate. Amortization of capitalized contract costs are included in cost of operations and selling, general and administrative costs on the consolidated statements of operations. Contract costs not directly related and incremental to the origination of new contracts, modification of existing contracts or to the fulfillment of the related subscriber contracts are expensed as incurred. Vivint Smart Home Retail Revenue Vivint Smart Home offers its subscribers combinations of smart home products and services, which together create an integrated smart home system that allows the Company's subscribers to monitor, control and protect their homes. As the products and services included in the subscriber's contract are integrated and highly interdependent, and because the products (including installation) and services must work together to deliver the monitoring, controlling and protection of their home, the Company has concluded that the products and services contracted for by the subscriber are generally not distinct within the context of the contract and, therefore, constitute a single, combined performance obligation. Revenues for this single, combined performance obligation are recognized on a straight-line basis over the subscriber's contract term, which is the period in which the parties to the contract have enforceable rights and obligations. The Company has determined that certain contracts that do not require a long-term commitment for monitoring services by the subscriber contain a material right to renew the contract, because the subscriber does not have to purchase the products upon renewal. Proceeds allocated to the material right are recognized over the period of the benefit. The majority of Vivint Smart Home's subscription contracts are five years and are generally non-cancelable. These contracts generally convert into month-to-month agreements at the end of the initial term, while some subscribers are month-to-month from inception. Payment for Vivint Smart Home services is generally due in advance on a monthly basis. Product sales and other one-time fees are invoiced to subscribers at time of sale. Revenues for any products or services that are considered separate performance obligations are recognized upon delivery. Payments received or billed in advance are reported as deferred revenues.
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 , 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. As of June 30, 2023, the trust liability is classified within non-current liabilities - held-for-sale on the Company's condensed consolidated balance sheet.
Segment Reporting	The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. The Company manages its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus. The acquired operations from the Vivint Smart Home acquisition are reported within the Vivint Smart Home segment. NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of the Company's 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). The accounting policies of the segments are the same as those applied in the consolidated financial statements as disclosed in Note 2, Summary of Significant Accounting Policies , to the Company’s 2022 Form 10-K.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2023
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 customer relationships, net and other intangible assets, net: (In millions) June 30, 2023 December 31, 2022 Property, plant and equipment accumulated depreciation $ 1,351 $ 1,478 Customer relationships and other intangible assets accumulated amortization 2,394 2,112
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, 2023 and 2022: Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Beginning balance $ 121 $ 666 $ 133 $ 683 Acquired balance from Vivint Smart Home — — 22 — Provision for credit losses 45 26 80 51 Write-offs (66) (71) (144) (121) Recoveries collected 12 6 21 14 Other 8 — 8 — Ending balance $ 120 $ 627 $ 120 $ 627
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, 2023 December 31, 2022 Cash and cash equivalents $ 422 $ 430 Funds deposited by counterparties 365 1,708 Restricted cash 26 40 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 813 $ 2,178
Schedule of Goodwill	The following table represents the changes in goodwill during the six months ended June 30, 2023: (In millions) Texas East West/Services/Other Vivint Smart Home Total Balance as of December 31, 2022 $ 710 $ 723 $ 217 $ — $ 1,650 Goodwill resulting from the acquisition of Vivint Smart Home — — — 3,492 3,492 Sale of business — (2) — — (2) Foreign currency translation adjustments — — 3 — 3 Balance as of June 30, 2023 $ 710 $ 721 $ 220 $ 3,492 $ 5,143

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2023
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, 2023 and 2022: Three months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 1,563 $ 446 $ 406 $ 444 $ — $ 2,859 Business 832 1,912 424 — — 3,168 Total retail revenue (b) 2,395 2,358 830 444 — 6,027 Energy revenue (b) 16 28 40 — (1) 83 Capacity revenue (b) — 49 — — — 49 Mark-to-market for economic hedging activities (c) — 52 23 — — 75 Contract amortization — (7) (1) — — (8) Other revenue (b) 104 23 — — (5) 122 Total revenue 2,515 2,503 892 444 (6) 6,348 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 6 7 — — 13 Less: Realized and unrealized ASC 815 revenue 14 99 7 — (1) 119 Total revenue from contracts with customers $ 2,501 $ 2,398 $ 878 $ 444 $ (5) $ 6,216 (a) Home includes Services and Vivint Smart Home (b) 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/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 16 $ — $ — $ — $ 16 Energy revenue — 13 (7) — (1) 5 Capacity revenue — 17 — — — 17 Other revenue 14 1 (9) — — 6 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate/Eliminations Total Retail revenue: Home (a) $ 1,655 $ 417 $ 543 $ (1) $ 2,614 Business 910 2,983 444 — 4,337 Total retail revenue 2,565 3,400 987 (1) 6,951 Energy revenue (b) 38 128 131 9 306 Capacity revenue (b) — 89 1 — 90 Mark-to-market for economic hedging activities (c) (1) (106) (38) (3) (148) Contract amortization — (11) (2) — (13) Other revenue (b) 90 14 (3) (5) 96 Total revenue 2,692 3,514 1,076 — 7,282 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — (4) 8 — 4 Less: Realized and unrealized ASC 815 revenue (13) (123) (70) 7 (199) Total revenue from contracts with customers $ 2,705 $ 3,641 $ 1,138 $ (7) $ 7,477 (a) Home includes Services (b) 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/Services/Other Corporate/Eliminations Total Energy revenue $ — $ (19) $ (20) $ 9 $ (30) Capacity revenue — 9 — — 9 Other revenue (12) (7) (12) 1 (30) (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate/Eliminations Total Retail revenue: Home (b) $ 2,799 $ 1,097 $ 1,031 $ 592 $ — $ 5,519 Business 1,554 5,277 1,040 — — 7,871 Total retail revenue (c) 4,353 6,374 2,071 592 — 13,390 Energy revenue (c) 20 102 88 — 1 211 Capacity revenue (c) — 90 1 — — 91 Mark-to-market for economic hedging activities (d) — 87 90 — (11) 166 Contract amortization — (18) (1) — — (19) Other revenue (c) 176 44 17 — (6) 231 Total revenue 4,549 6,679 2,266 592 (16) 14,070 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 5 16 — — 21 Less: Realized and unrealized ASC 815 revenue 12 212 104 — (10) 318 Total revenue from contracts with customers $ 4,537 $ 6,462 $ 2,146 $ 592 $ (6) $ 13,731 (a) Includes results of operations following the acquisition date of March 10, 2023 (b) Home includes Services and Vivint Smart Home (c) 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/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 43 $ — $ — $ — $ 43 Energy revenue — 60 10 — 1 71 Capacity revenue — 23 — — — 23 Other revenue 12 (1) 4 — — 15 (d) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Six months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate/Eliminations Total Retail revenue: Home (a) $ 2,938 $ 996 $ 1,246 $ (1) $ 5,179 Business 1,573 6,925 844 — 9,342 Total retail revenue 4,511 7,921 2,090 (1) 14,521 Energy revenue (b) 53 332 185 14 584 Capacity revenue (b) — 204 2 — 206 Mark-to-market for economic hedging activities (c) (3) (236) (56) 14 (281) Contract amortization — (20) (2) — (22) Other revenue (b) 151 28 1 (10) 170 Total revenue 4,712 8,229 2,220 17 15,178 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — (13) 19 — 6 Less: Realized and unrealized ASC 815 revenue (20) (189) (112) 27 (294) Total revenue from contracts with customers $ 4,732 $ 8,431 $ 2,313 $ (10) $ 15,466 (a) Home includes Services (b) 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/Services/Other Corporate/Eliminations Total Energy revenue $ — $ 26 $ (40) $ 13 $ (1) Capacity revenue — 22 — — 22 Other revenue (17) (1) (16) — (34) (c) 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, 2023 and December 31, 2022: (In millions) June 30, 2023 December 31, 2022 Deferred customer acquisition costs $ 422 $ 126 Accounts receivable, net - Contracts with customers 3,049 4,704 Accounts receivable, net - Accounted for under topics other than ASC 606 194 64 Accounts receivable, net - Affiliate 31 5 Total accounts receivable, net $ 3,274 $ 4,773 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 1,297 $ 1,952 Deferred revenues (a) 1,658 186 (a) Deferred revenues from contracts with customers as of June 30, 2023 and December 31, 2022 were approximately $1.6 billion and $175 million, respectively. The increase in deferred revenues is primarily due to acquisition of Vivint Smart Home

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Total Consideration	The total consideration of $2.623 billion includes: (In millions) Vivint Smart Home, Inc. common shares outstanding as of March 10, 2023 of 216,901,639 at $12.00 per share $ 2,603 Other Vivint Smart Home, Inc. equity instruments (Cash out RSUs and PSUs, Stock Appreciation Rights, Private Placement Warrants) 6 Total Cash Consideration $ 2,609 Fair value of acquired Vivint Smart Home, Inc. equity awards attributable to pre-combination service 14 Total Consideration $ 2,623
Schedule of Purchase Price Allocation	The purchase price is provisionally allocated as follows: (In millions) Current Assets Cash and cash equivalents $ 120 Accounts receivable, net 60 Inventory 113 Prepayments and other current assets 37 Total current assets 330 Property, plant and equipment, net 49 Other Assets Operating lease right-of-use assets, net 35 Goodwill (a) 3,492 Intangible assets, net (b) : Customer relationships 1,740 Technology 860 Trade name 160 Sales channel contract 10 Intangible assets, net 2,770 Deferred income taxes 381 Other non-current assets 14 Total other assets 6,692 Total Assets $ 7,071 Current Liabilities Current portion of long-term debt and finance leases $ 14 Current portion of operating lease liabilities 13 Accounts payable 109 Derivatives instruments 80 Deferred revenue current 517 Accrued expenses and other current liabilities 207 Total current liabilities 940 Other Liabilities Long-term debt and finance leases 2,572 Non-current operating lease liabilities 28 Derivatives instruments 32 Deferred income taxes 18 Deferred revenue non-current 835 Other non-current liabilities 23 Total other liabilities 3,508 Total Liabilities $ 4,448 Vivint Smart Home Purchase Price $ 2,623 (a) Goodwill arising from the acquisition is attributed to the value of the platform acquired, cross-selling opportunities, subscriber growth and the synergies expected from combining the operations of Vivint Smart Home with NRG's existing businesses. None of the goodwill recorded is expected to be deductible for tax purposes (b) The weighted average amortization period for total amortizable intangible assets is approximately ten years The following measurement period adjustments were recognized during the quarter ended June 30, 2023: (In millions) (Decrease)/Increase Goodwill $ (200) Intangible assets, net 270 Deferred income taxes (70) Net change in assets $ —
Schedule of Pro Forma Financial Information	The pro forma financial information has been prepared for illustrative and informational purposes only, and is not intended to project future operating results or be indicative of what the Company's financial performance would have been had the transactions occurred on the date acquired. No effect has been given to prospective operating synergies. Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Total operating revenues $ 6,348 $ 7,690 $ 14,356 $ 15,978 Net income/(loss) 342 466 (955) 2,018
Schedule of Classified Held for Sale	As of June 30, 2023, the following is classified as held for sale in the Condensed Consolidated Balance Sheets, primarily related to the planned sale of STP, which is in the Texas segment: (In millions) Inventory $ 63 Prepayments and other current assets 12 Current assets - held-for-sale $ 75 Property, plant and equipment, net $ 227 Intangible assets, net 12 Nuclear decommissioning trust fund 922 Non-current assets - held-for-sale $ 1,161 Total assets held-for-sale $ 1,236 Current liabilities - held-for-sale $ 36 Nuclear decommissioning reserve $ 336 Nuclear decommissioning trust liability 551 Other non-current liabilities 60 Non-current liabilities - held-for-sale $ 947 Total liabilities held-for-sale $ 983 The Company recorded income before income taxes from its 44% equity interest in STP as follows: Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Income before income taxes (a) $ 23 $ 121 $ 7 $ 156 (a) Excludes the impact of the Company's hedges at the portfolio level

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2023
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 value and fair value of the Company's long-term debt, including current portion, is as follows: June 30, 2023 December 31, 2022 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Convertible Senior Notes $ 575 $ 618 $ 575 $ 576 Other long-term debt, including current portion 11,535 10,563 7,523 6,432 Total long-term debt, including current portion (a) $ 12,110 $ 11,181 $ 8,098 $ 7,008 (a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt in the Company's consolidated balance sheets
Schedule of 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, 2023 and December 31, 2022: June 30, 2023 December 31, 2022 (In millions) Level 2 Level 3 Level 2 Level 3 Convertible Senior Notes $ 618 $ — $ 576 $ — Other long-term debt, including current portion 9,863 700 6,432 — Total long-term debt, including current portion $ 10,481 $ 700 $ 7,008 $ —
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, 2023 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 19 $ — $ 19 $ — Nuclear trust fund investments (classified within non-current assets - held-for-sale): Cash and cash equivalents 21 21 — — U.S. government and federal agency obligations 90 88 2 — Federal agency mortgage-backed securities 103 — 103 — Commercial mortgage-backed securities 34 — 34 — Corporate debt securities 116 — 116 — Equity securities 464 464 — — Foreign government fixed income securities 1 — 1 — Derivative assets: Foreign exchange contracts 8 — 8 — Commodity contracts 7,301 1,225 4,564 1,512 Interest rate contracts 24 — 24 — Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments (classified within non-current assets - held-for-sale) 93 Equity securities (classified within other non-current assets) 6 Total assets $ 8,280 $ 1,798 $ 4,871 $ 1,512 Derivative liabilities: Foreign exchange contracts $ 6 $ — $ 6 $ — Commodity contracts 5,600 1,072 3,921 607 Consumer Financing Program 115 — — 115 Total liabilities $ 5,721 $ 1,072 $ 3,927 $ 722 December 31, 2022 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 19 $ — $ 19 $ — Nuclear trust fund investments: Cash and cash equivalents 15 15 — — U.S. government and federal agency obligations 86 84 2 — Federal agency mortgage-backed securities 101 — 101 — Commercial mortgage-backed securities 35 — 35 — Corporate debt securities 114 — 114 — Equity securities 403 403 — — Foreign government fixed income securities 1 — 1 — Other trust fund investments (classified within other non-current assets): U.S. government and federal agency obligations 1 1 — — Derivative assets: Foreign exchange contracts 18 — 18 — Commodity contracts 11,976 1,929 8,796 1,251 Measured using net asset value practical expedient: Equity securities — nuclear trust fund investments 83 Equity securities (classified within other non-current assets) 6 Total assets $ 12,858 $ 2,432 $ 9,086 $ 1,251 Derivative liabilities: Foreign exchange contracts $ 2 $ — $ 2 $ — Commodity contracts 8,439 1,244 6,449 746 Total liabilities $ 8,441 $ 1,244 $ 6,451 $ 746
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 table reconciles, for the three and six months ended June 30, 2023 and 2022, the beginning and ending balances for financial instruments that are recognized at fair value in the condensed consolidated financial statements, using significant unobservable inputs, for commodity derivatives: Fair Value Measurement Using Significant Unobservable Inputs (Level 3) Commodity Derivatives (a) (In millions) Three months ended June 30, 2023 Three months ended June 30, 2022 Six months ended June 30, 2023 Six months ended June 30, 2022 Beginning balance $ 471 $ 528 $ 505 $ 293 Total (losses)/gains realized/unrealized included in earnings (86) 293 (177) 459 Purchases 99 6 140 29 Transfers into Level 3 (b) 414 568 438 621 Transfers out of Level 3 (b) 7 8 (1) 1 Ending balance $ 905 $ 1,403 $ 905 $ 1,403 (Losses)/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 $ (76) $ 297 $ (131) $ 534 (a) Consists of derivative assets and liabilities, net, excluding derivatives liabilities from Consumer Financing Program, which are presented in a separate table below (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
Reconciliation of Contractual Obligations of Consumer Financing Program Recognized at Fair Value	The following table reconciles, for the three and six months ended June 30, 2023 the beginning and ending balances of the contractual obligations from the Consumer Financing Program 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) Consumer Financing Program (In millions) Three months ended June 30, 2023 Six months ended June 30, 2023 Beginning balance $ 111 $ — Contractual obligations added from the acquisition of Vivint Smart Home — 112 New contractual obligations 20 22 Settlements (19) (22) Total losses included in earnings 3 3 Ending balance $ 115 $ 115
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, 2023 and December 31, 2022: June 30, 2023 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 105 $ 123 Discounted Cash Flow Forward Market Price (per MMBtu) $ 1 $ 17 $ 4 Power Contracts 1,373 427 Discounted Cash Flow Forward Market Price (per MWh) 1 263 47 FTRs 34 57 Discounted Cash Flow Auction Prices (per MWh) (23) 146 1 Consumer Financing Program — 115 Discounted Cash Flow Collateral Default Rates 1.51 % 76.59 % 5.86 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.64 % Discounted Cash Flow Loss Severity Rates 6.00 % 36.00 % 10.20 % $ 1,512 $ 722 December 31, 2022 Fair Value Input/Range (In millions) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 340 $ 448 Discounted Cash Flow Forward Market Price (per MMBtu) $ 2 $ 48 $ 6 Power Contracts 843 216 Discounted Cash Flow Forward Market Price (per MWh) 3 431 48 FTRs 68 82 Discounted Cash Flow Auction Prices (per MWh) (32) 610 0 $ 1,251 $ 746
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, 2023 and December 31, 2022: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Natural Gas/Power Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Natural Gas/Power Sell Increase/(Decrease) Lower/(Higher) FTR Prices Buy Increase/(Decrease) Higher/(Lower) FTR Prices Sell Increase/(Decrease) Lower/(Higher) Collateral Default Rates n/a Increase/(Decrease) Higher/(Lower) Collateral Prepayment Rates n/a Increase/(Decrease) Lower/(Higher) Loss Severity Rates n/a Increase/(Decrease) Higher/(Lower)
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 73 % Financial institutions 27 Total as of June 30, 2023 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 55 % Non-investment grade/non-rated 45 Total as of June 30, 2023 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, 2023
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, 2023, the trust funds are classified within non-current assets - held-for-sale on the Company's condensed consolidated balance sheet. As of June 30, 2023 As of December 31, 2022 (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 $ 21 $ — $ — — $ 15 $ — $ — — U.S. government and federal agency obligations 90 1 5 12 86 — 5 11 Federal agency mortgage-backed securities 103 — 8 25 101 — 11 26 Commercial mortgage-backed securities 34 — 4 29 35 — 4 30 Corporate debt securities 116 — 10 12 114 — 13 12 Equity securities 557 408 — — 486 346 3 — Foreign government fixed income securities 1 — — 20 1 — — 17 Total $ 922 $ 409 $ 27 $ 838 $ 346 $ 36
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) 2023 2022 Realized gains $ 6 $ 8 Realized losses (10) (11) Proceeds from sale of securities 180 278

Accounting for Derivative Ins_2

Accounting for Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2023
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, 2023 and December 31, 2022. 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, 2023 December 31, 2022 Emissions Short Ton — 1 Renewable Energy Certificates Certificates 13 15 Coal Short Ton 12 11 Natural Gas MMBtu 804 422 Oil Barrels — 1 Power MWh 210 192 Consumer Financing Program Dollars 942 — Foreign Exchange Dollars 590 569 Interest Dollars 1,400 —
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, 2023 December 31, 2022 June 30, 2023 December 31, 2022 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Interest rate contracts - current $ 20 $ — $ — $ — Interest rate contracts - long-term 4 — — — Foreign exchange contracts - current 5 11 3 1 Foreign exchange contracts - long-term 3 7 3 1 Consumer Financing Program - short-term — — 78 — Consumer Financing Program - long-term — — 37 — Commodity contracts - current 4,398 7,875 3,751 6,194 Commodity contracts - long-term 2,903 4,101 1,849 2,245 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 7,333 $ 11,994 $ 5,721 $ 8,441
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, 2023 Foreign exchange contracts: Derivative assets $ 8 $ (5) $ — $ 3 Derivative liabilities (6) 5 — (1) Total foreign exchange contracts $ 2 $ — $ — $ 2 Commodity contracts: Derivative assets $ 7,301 $ (5,344) $ (340) $ 1,617 Derivative liabilities (5,600) 5,344 5 (251) Total commodity contracts $ 1,701 $ — $ (335) $ 1,366 Consumer Financing Program: Derivative liabilities $ (115) $ — $ — $ (115) Interest rate contracts: Derivative assets $ 24 $ — $ — $ 24 Total derivative instruments $ 1,612 $ — $ (335) $ 1,277 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, 2022 Foreign exchange contracts: Derivative assets $ 18 $ (2) $ — $ 16 Derivative liabilities (2) 2 — — Total foreign exchange contracts $ 16 $ — $ — $ 16 Commodity contracts: Derivative assets $ 11,976 $ (7,897) $ (1,659) $ 2,420 Derivative liabilities (8,439) 7,897 20 (522) Total commodity contracts $ 3,537 $ — $ (1,639) $ 1,898 Total derivative instruments $ 3,553 $ — $ (1,639) $ 1,914
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, 2023 Foreign exchange contracts: Derivative assets $ 8 $ (5) $ — $ 3 Derivative liabilities (6) 5 — (1) Total foreign exchange contracts $ 2 $ — $ — $ 2 Commodity contracts: Derivative assets $ 7,301 $ (5,344) $ (340) $ 1,617 Derivative liabilities (5,600) 5,344 5 (251) Total commodity contracts $ 1,701 $ — $ (335) $ 1,366 Consumer Financing Program: Derivative liabilities $ (115) $ — $ — $ (115) Interest rate contracts: Derivative assets $ 24 $ — $ — $ 24 Total derivative instruments $ 1,612 $ — $ (335) $ 1,277 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, 2022 Foreign exchange contracts: Derivative assets $ 18 $ (2) $ — $ 16 Derivative liabilities (2) 2 — — Total foreign exchange contracts $ 16 $ — $ — $ 16 Commodity contracts: Derivative assets $ 11,976 $ (7,897) $ (1,659) $ 2,420 Derivative liabilities (8,439) 7,897 20 (522) Total commodity contracts $ 3,537 $ — $ (1,639) $ 1,898 Total derivative instruments $ 3,553 $ — $ (1,639) $ 1,914
Pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations	The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges or fair value hedges and trading activity on the Company's statement of operations. The effect of foreign exchange and commodity hedges are included within revenues and cost of operations. The effect of the interest rate contracts are included within interest expense. The effect of the Consumer Financing Program is included in other income, net. (In millions) Three months ended June 30, Six months ended June 30, Unrealized mark-to-market results 2023 2022 2023 2022 Reversal of previously recognized unrealized (gains) on settled positions related to economic hedges $ (151) $ (197) $ (997) $ (605) Reversal of acquired loss/(gain) positions related to economic hedges 35 48 10 (12) Net unrealized gains/(losses) on open positions related to economic hedges 180 868 (893) 3,613 Total unrealized mark-to-market gains/(losses) for economic hedging activities 64 719 (1,880) 2,996 Reversal of previously recognized unrealized losses on settled positions related to trading activity 10 8 11 9 Net unrealized gains/(losses) on open positions related to trading activity 3 (10) 14 (25) Total unrealized mark-to-market gains/(losses) for trading activity 13 (2) 25 (16) Total unrealized gains/(losses) - commodities and foreign exchange $ 77 $ 717 $ (1,855) $ 2,980 Three months ended June 30, Six months ended June 30, (In millions) 2023 2022 2023 2022 Unrealized gains/(losses) included in revenues - commodities $ 88 $ (150) $ 191 $ (297) Unrealized gains/(losses) included in cost of operations - commodities 5 858 (2,032) 3,272 Unrealized (losses)/gains included in cost of operations - foreign exchange (16) 9 (14) 5 Total impact to statement of operations - commodities and foreign exchange $ 77 $ 717 $ (1,855) $ 2,980 Total impact to statement of operations - consumer financing program $ (3) $ — $ (3) $ — Total impact to statement of operations - interest rate contracts $ 29 $ — $ 24 $ —

Long-term Debt and Finance Le_2

Long-term Debt and Finance Leases (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Long-term Debt and Finance Leases	Long-term debt and finance leases consisted of the following: (In millions, except rates) June 30, 2023 December 31, 2022 Interest rate % Recourse debt: Senior Notes, due 2027 $ 375 $ 375 6.625 Senior Notes, due 2028 821 821 5.750 Senior Notes, due 2029 733 733 5.250 Senior Notes, due 2029 500 500 3.375 Senior Notes, due 2031 1,030 1,030 3.625 Senior Notes, due 2032 1,100 1,100 3.875 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 2025 500 500 2.000 Senior Secured First Lien Notes, due 2027 900 900 2.450 Senior Secured First Lien Notes, due 2029 500 500 4.450 Senior Secured First Lien Notes, due 2033 740 — 7.000 Revolving Credit Facility 700 — various Tax-exempt bonds 466 466 1.250 - 4.750 Subtotal recourse debt 9,540 8,100 Non-recourse debt: Vivint Smart Home Senior Secured Notes, due 2027 600 — 6.750 Vivint Smart Home Senior Notes, due 2029 800 — 5.750 Vivint Smart Home Senior Secured Term Loan, due 2028 1,326 — various Subtotal all Vivint Smart Home non-recourse debt 2,726 — Subtotal long-term debt (including current maturities) 12,266 8,100 Finance leases 19 11 various Subtotal long-term debt and finance leases (including current maturities) 12,285 8,111 Less current maturities (1,319) (63) Less debt issuance costs (73) (70) Discounts (156) (2) Total long-term debt and finance leases $ 10,737 $ 7,976 (a) As of the ex-dividend date of July 31, 2023, the Convertible Senior Notes were convertible at a price of $42.17, which is equivalent to a conversion rate of approximately 23.7112 shares of common stock per $1,000 principal amount
Schedule of Debt Instrument, Interest Expense	The following table details the interest expense recorded in connection with the Convertible Senior Notes, due 2048: Three months ended June 30, Six months ended June 30, ($ In millions) 2023 2022 2023 2022 Contractual interest expense $ 4 $ 4 $ 8 $ 8 Amortization of deferred finance costs — 1 1 1 Total $ 4 $ 5 $ 9 $ 9 Effective Interest Rate 0.75 % 0.76 % 1.52 % 1.52 %

Investments Accounted for Usi_2

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Tables)	6 Months Ended
	Jun. 30, 2023
Variable Interest Entities Disclosure [Abstract]
Financial Information for Consolidated VIEs	The summarized financial information for the Company's consolidated VIE consisted of the following: (In millions) June 30, 2023 December 31, 2022 Accounts receivable and Other current assets $ 1,256 $ 2,108 Current liabilities 152 152 Net assets $ 1,104 $ 1,956

Changes in Capital Structure (T

Changes in Capital Structure (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Changes in NRG's Preferred Stock and Commons Shares Issued and Outstanding	The following table reflects the changes in NRG's preferred and common stock issued and outstanding: Preferred Common Issued and Outstanding Issued Treasury Outstanding Balance as of December 31, 2022 — 423,897,001 (194,335,971) 229,561,030 Shares issued under LTIPs — 778,213 — 778,213 Shares issued under ESPP — — 86,516 86,516 Issuance of Series A Preferred Stock 650,000 — — — Balance as of June 30, 2023 650,000 424,675,214 (194,249,455) 230,425,759 Shares issued under LTIPs — 13,812 — 13,812 Shares repurchased — — (1,322,141) (1,322,141) Balance as of July 31, 2023 650,000 424,689,026 (195,571,596) 229,117,430

Income_(Loss) Per Share (Tables

Income/(Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
NRG's basic and diluted income/(loss per share	NRG's basic and diluted income/(loss) per share is shown in the following table: Three months ended June 30, Six months ended June 30, (In millions, except per share data) 2023 2022 2023 2022 Basic income/(loss) per share: Net income/(loss) $ 308 $ 513 $ (1,027) $ 2,249 Less: Cumulative dividends attributable to Series A Preferred Stock 17 — 21 — Net income/(loss) available for common stockholders $ 291 $ 513 $ (1,048) $ 2,249 Weighted average number of common shares outstanding - basic 231 237 230 240 Income/(loss) per weighted average common share — basic $ 1.26 $ 2.16 $ (4.56) $ 9.37 Diluted income/(loss) per share: Net income/(loss) $ 308 $ 513 $ (1,027) $ 2,249 Less: Cumulative dividends attributable to Series A Preferred Stock 17 — 21 — Net income/(loss) available for common stockholders $ 291 $ 513 $ (1,048) $ 2,249 Weighted average number of common shares outstanding - basic 231 237 230 240 Incremental shares attributable to the issuance of equity compensation (treasury stock method) 1 — — — Weighted average number of common shares outstanding - dilutive 232 237 230 240 Income/(loss) per weighted average common share — diluted $ 1.25 $ 2.16 $ (4.56) $ 9.37
Summary of outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted income/(loss) per share	The following table summarizes the Company's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted income/(loss) per share: Three months ended June 30, Six months ended June 30, (In millions of shares) 2023 2022 2023 2022 Equity compensation plans 1 — 7 —

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 2,515 $ 2,503 $ 892 $ 444 $ — $ (6) $ 6,348 Depreciation and amortization 73 30 23 180 9 — 315 Gain on sale of assets — 3 — — — — 3 Equity in earnings of unconsolidated affiliates — — 5 — — — 5 Income/(loss) before income taxes 785 (100) (128) (23) (137) — 397 Net income/(loss) $ 785 $ (101) $ (129) $ (23) $ (224) $ — $ 308 Three months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate Eliminations Total Revenue $ 2,692 $ 3,514 $ 1,076 $ — $ — $ 7,282 Depreciation and amortization 77 50 22 8 — 157 Impairment losses — 155 — — — 155 (Loss)/gain on sale of assets (12) — 44 — — 32 Equity in earnings of unconsolidated affiliates — — 4 — — 4 Income/(loss) before income taxes 762 (13) 35 (119) — 665 Net income/(loss) $ 762 $ (12) $ 24 $ (261) $ — $ 513 Six months ended June 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate Eliminations Total Revenue $ 4,549 $ 6,679 $ 2,266 $ 592 $ — $ (16) $ 14,070 Depreciation and amortization 148 60 47 232 18 — 505 Gain on sale of assets — 202 — — — — 202 Equity in earnings of unconsolidated affiliates — — 10 — — — 10 Income/(loss) before income taxes 1,069 (1,502) (479) (62) (300) — (1,274) Net income/(loss) $ 1,069 $ (1,503) $ (433) $ (62) $ (98) $ — $ (1,027) (a) Includes results of operations following the acquisition date of March 10, 2023 Six months ended June 30, 2022 (In millions) Texas East West/Services/Other Corporate Eliminations Total Revenue $ 4,712 $ 8,229 $ 2,220 $ — $ 17 $ 15,178 Depreciation and amortization 154 127 43 16 — 340 Impairment losses — 155 — — — 155 (Loss)/gain on sale of assets (12) — 43 (2) — 29 Equity in losses of unconsolidated affiliates (1) — (10) — — (11) Income/(loss) before income taxes 1,533 1,525 164 (250) — 2,972 Net income/(loss) $ 1,533 $ 1,526 $ 154 $ (964) $ — $ 2,249

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Provision	The income tax provision consisted of the following: Three months ended June 30, Six months ended June 30, (In millions, except rates) 2023 2022 2023 2022 Income/(Loss) before income taxes $ 397 $ 665 $ (1,274) $ 2,972 Income tax expense/(benefit) 89 152 (247) 723 Effective income tax rate 22.4 % 22.9 % 19.4 % 24.3 %

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2023
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) 2023 2022 2023 2022 Revenues from Related Parties Included in Revenue Gladstone $ — $ — $ 1 $ 1 Ivanpah (a) 21 9 55 22 Midway-Sunset 1 1 2 3 Total $ 22 $ 10 $ 58 $ 26 (a) Also includes fees under project management agreements with each project company

Nature of Business and Basis _2

Nature of Business and Basis of Presentation - General (Details) counterparty in Millions	6 Months Ended
	Jun. 30, 2023 counterparty GW
Business Acquisition [Line Items]
Generation capacity (in GW) | GW	16
Home
Business Acquisition [Line Items]
Customers | counterparty	7.5

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Vivint Flex Pay and Capitalized Contract Costs (Details) - Vivint Smart Home	6 Months Ended
	Jun. 30, 2023 performanceObligation
Product Information [Line Items]
Customer, short-term financing term	6 months
Number of performance obligations	1
Contract with customer, term	5 years
Minimum
Product Information [Line Items]
Customer repayment terms	6 months
Liability for customer lost principal balances, percentage	2.60%
Maximum
Product Information [Line Items]
Customer repayment terms	60 months
Liability for customer lost principal balances, percentage	100%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Other Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Property, plant and equipment accumulated depreciation	$ 1,351	$ 1,478
Customer relationships and other intangible assets accumulated amortization	$ 2,394	$ 2,112

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 121	$ 666	$ 133	$ 683
Acquired balance from Vivint Smart Home	0	0	22	0
Provision for credit losses	45	26	80	51
Write-offs	(66)	(71)	(144)	(121)
Recoveries collected	12	6	21	14
Other	8	0	8	0
Ending balance	$ 120	$ 627	$ 120	$ 627

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Cash and cash equivalents	$ 422	$ 430
Funds deposited by counterparties	365	1,708
Restricted cash	26	40
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows	$ 813	$ 2,178	$ 4,594	$ 1,110

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance beginning of period	$ 1,650
Goodwill resulting from the acquisition of Vivint Smart Home	3,492
Sale of business	(2)
Foreign currency translation adjustments	3
Balance end of period	5,143
Texas
Goodwill [Roll Forward]
Balance beginning of period	710
Goodwill resulting from the acquisition of Vivint Smart Home	0
Sale of business	0
Foreign currency translation adjustments	0
Balance end of period	710
East
Goodwill [Roll Forward]
Balance beginning of period	723
Goodwill resulting from the acquisition of Vivint Smart Home	0
Sale of business	(2)
Foreign currency translation adjustments	0
Balance end of period	721
West/Services/Other
Goodwill [Roll Forward]
Balance beginning of period	217
Goodwill resulting from the acquisition of Vivint Smart Home	0
Sale of business	0
Foreign currency translation adjustments	3
Balance end of period	220
Vivint Smart Home
Goodwill [Roll Forward]
Balance beginning of period	0
Goodwill resulting from the acquisition of Vivint Smart Home	3,492
Sale of business	0
Foreign currency translation adjustments	0
Balance end of period	$ 3,492

Revenue Recognition - Retail Re

Revenue Recognition - Retail Revenue (Details)	6 Months Ended
	Jun. 30, 2023
Maximum | Vivint Home Services
Disaggregation of Revenue [Line Items]
Expected period of benefit	five years

Revenue Recognition - Performan

Revenue Recognition - Performance Obligations Expected Timing of Satisfaction (Details) $ in Millions	Jun. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 742
Revenue remaining performance obligation period	6 months
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	$ 1,300
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 949
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 622
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 336
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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 Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 6,216	$ 7,477	$ 13,731	$ 15,466
Mark-to-market for economic hedging activities	64	719	(1,880)	2,996
Revenue	6,348	7,282	14,070	15,178
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	13	4	21	6
Derivative revenue	77	717	(1,855)	2,980
Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(5)	(7)	(6)	(10)
Revenue	(6)	0	(16)	17
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0	0	0	0
Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,027	6,951	13,390	14,521
Derivative revenue	16		43
Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	(1)	0	(1)
Derivative revenue	0		0
Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	306	211	584
Derivative revenue	5	(30)	71	(1)
Energy revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	9	1	14
Derivative revenue	(1)	9	1	13
Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	49	90	91	206
Derivative revenue	17	9	23	22
Capacity revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Derivative revenue	0	0	0	0
Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	75	(148)	166	(281)
Less: Realized and unrealized ASC 815 revenue	119	(199)	318	(294)
Derivative revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	(3)	(11)	14
Less: Realized and unrealized ASC 815 revenue	(1)	7	(10)	27
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	122	96	231	170
Contract amortization	(8)	(13)	(19)	(22)
Other revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(5)	(5)	(6)	(10)
Contract amortization	0	0	0	0
Total operating revenue
Disaggregation of Revenue [Line Items]
Revenue	6,348	7,282	14,070	15,178
Total operating revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(6)	0	(16)	17
Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	6	(30)	15	(34)
Other revenue, derivative | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Derivative revenue	0	1	0	0
Home | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,859	2,614	5,519	5,179
Home | Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	(1)	0	(1)
Business | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,168	4,337	7,871	9,342
Business | 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	2,501	2,705	4,537	4,732
Revenue	2,515	2,692	4,549	4,712
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0	0	0	0
Texas | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,395	2,565	4,353	4,511
Derivative revenue	0		0
Texas | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	38	20	53
Derivative revenue	0	0	0	0
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	(1)	0	(3)
Less: Realized and unrealized ASC 815 revenue	14	(13)	12	(20)
Texas | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	104	90	176	151
Contract amortization	0	0	0	0
Texas | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,515	2,692	4,549	4,712
Texas | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	14	(12)	12	(17)
Texas | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,563	1,655	2,799	2,938
Texas | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	832	910	1,554	1,573
East | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,398	3,641	6,462	8,431
Revenue	2,503	3,514	6,679	8,229
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	6	(4)	5	(13)
East | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,358	3,400	6,374	7,921
Derivative revenue	16		43
East | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	28	128	102	332
Derivative revenue	13	(19)	60	26
East | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	49	89	90	204
Derivative revenue	17	9	23	22
East | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	52	(106)	87	(236)
Less: Realized and unrealized ASC 815 revenue	99	(123)	212	(189)
East | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	14	44	28
Contract amortization	(7)	(11)	(18)	(20)
East | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,503	3,514	6,679	8,229
East | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	1	(7)	(1)	(1)
East | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	446	417	1,097	996
East | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,912	2,983	5,277	6,925
West/Services/Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	878	1,138	2,146	2,313
Revenue	892	1,076	2,266	2,220
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	7	8	16	19
West/Services/Other | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	830	987	2,071	2,090
Derivative revenue	0		0
West/Services/Other | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40	131	88	185
Derivative revenue	(7)	(20)	10	(40)
West/Services/Other | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	1	1	2
Derivative revenue	0	0	0	0
West/Services/Other | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	23	(38)	90	(56)
Less: Realized and unrealized ASC 815 revenue	7	(70)	104	(112)
West/Services/Other | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	(3)	17	1
Contract amortization	(1)	(2)	(1)	(2)
West/Services/Other | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	892	1,076	2,266	2,220
West/Services/Other | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	(9)	(12)	4	(16)
West/Services/Other | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	406	543	1,031	1,246
West/Services/Other | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	424	$ 444	1,040	$ 844
Vivint Smart Home | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	444		592
Revenue	444		592
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0		0
Vivint Smart Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	444		592
Derivative revenue	0		0
Vivint Smart Home | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Derivative revenue	0		0
Vivint Smart Home | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Derivative revenue	0		0
Vivint Smart Home | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0		0
Less: Realized and unrealized ASC 815 revenue	0		0
Vivint Smart Home | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Contract amortization	0		0
Vivint Smart Home | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	444		592
Vivint Smart Home | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	0		0
Vivint Smart Home | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	444		592
Vivint Smart Home | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0		$ 0

Revenue Recognition - Contract

Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule Of Contract Assets And Liabilities [Line Items]
Deferred customer acquisition costs	$ 422		$ 422		$ 126
Total accounts receivable, net	3,274		3,274		4,773
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)	1,297		1,297		1,952
Deferred revenues	1,658		1,658		186
Deferred revenues	1,600		1,600		175
Revenue recognized	310	$ 106	168	$ 117
Accounts receivable, net - Contracts with customers
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	3,049		3,049		4,704
Accounts receivable, net - Accounted for under topics other than ASC 606
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	194		194		64
Accounts receivable, net - Affiliate
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	$ 31		$ 31		$ 5

Acquisitions and Dispositions -

Acquisitions and Dispositions - Acquisitions Narrative (Details)		1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 10, 2023 USD ($) customer $ / shares	Feb. 28, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 09, 2023 USD ($)
Business Acquisition [Line Items]
Proceeds from issuance of preferred stock					$ 635,000,000	$ 0
Issuance of Series A Preferred Stock				$ 636,000,000
Senior Notes | Senior Secured First Lien Notes, due 2033
Business Acquisition [Line Items]
Debt issuance amount							$ 740,000,000
Interest rate, stated percentage							7%
Vivint Smart Home
Business Acquisition [Line Items]
Customers added (nearly) | customer	2,000,000
Acquisition, share price (in usd per share) | $ / shares	$ 12
Cash paid to acquire business	$ 2,609,000,000
Acquisition costs			$ 2,000,000		$ 38,000,000
Consideration	$ 2,623,000,000
Weighted average useful life, years	10 years
Long-term debt acquired, aggregate principal	$ 2,700,000,000
Amortization of the difference between the principal and fair value of acquired debt	$ 152,000,000
Vivint Smart Home | Customer relationships
Business Acquisition [Line Items]
Weighted average useful life, years	12 years
Vivint Smart Home | Technology
Business Acquisition [Line Items]
Weighted average useful life, years	5 years
Vivint Smart Home | Trade name
Business Acquisition [Line Items]
Weighted average useful life, years	10 years
Vivint Smart Home | Revolving Credit Facility
Business Acquisition [Line Items]
Borrowings on credit facility	$ 900,000,000
Increase to existing revolving commitments		$ 600,000,000
Vivint Smart Home | Series A Preferred Stock
Business Acquisition [Line Items]
Proceeds from issuance of preferred stock	635,000,000
Issuance of Series A Preferred Stock	$ 650,000,000
Preferred stock, dividend rate, percentage	10.25%
Vivint Smart Home | Senior Notes | Senior Secured First Lien Notes, due 2033
Business Acquisition [Line Items]
Proceeds from issuance of senior notes	$ 724,000,000
Debt issuance amount	$ 740,000,000
Interest rate, stated percentage	7%

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Consideration (Details) - Vivint Smart Home $ / shares in Units, $ in Millions	Mar. 10, 2023 USD ($) $ / shares shares
Business Acquisition [Line Items]
Acquisition, shares outstanding (in shares) | shares	216,901,639
Acquisition, share price (in usd per share) | $ / shares	$ 12
Vivint Smart Home, Inc. common shares outstanding as of March 10, 2023 of 216,901,639 at $12.00 per share	$ 2,603
Other Vivint Smart Home, Inc. equity instruments (Cash out RSUs and PSUs, Stock Appreciation Rights, Private Placement Warrants)	6
Total Cash Consideration	2,609
Total Consideration	2,623
Equity Awards Pre-combination Service
Business Acquisition [Line Items]
Fair value of acquired Vivint Smart Home, Inc. equity awards attributable to pre-combination service	$ 14

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($)	Mar. 10, 2023	Jun. 30, 2023	Dec. 31, 2022
Other Assets
Goodwill		$ 5,143,000,000	$ 1,650,000,000
Vivint Smart Home
Current Assets
Cash and cash equivalents	$ 120,000,000
Accounts receivable, net	60,000,000
Inventory	113,000,000
Prepayments and other current assets	37,000,000
Total current assets	330,000,000
Property, plant and equipment, net	49,000,000
Other Assets
Operating lease right-of-use assets, net	35,000,000
Goodwill	3,492,000,000
Intangible assets, net	2,770,000,000
Deferred income taxes	381,000,000
Other non-current assets	14,000,000
Total other assets	6,692,000,000
Total Assets	7,071,000,000
Current Liabilities
Current portion of long-term debt and finance leases	14,000,000
Current portion of operating lease liabilities	13,000,000
Accounts payable	109,000,000
Derivatives instruments	80,000,000
Deferred revenue current	517,000,000
Accrued expenses and other current liabilities	207,000,000
Total current liabilities	940,000,000
Other Liabilities
Long-term debt and finance leases	2,572,000,000
Non-current operating lease liabilities	28,000,000
Derivatives instruments	32,000,000
Deferred income taxes	18,000,000
Deferred revenue non-current	835,000,000
Other non-current liabilities	23,000,000
Total other liabilities	3,508,000,000
Total Liabilities	4,448,000,000
Vivint Smart Home Purchase Price	2,623,000,000
Goodwill, expected to be tax deductible	$ 0
Weighted average useful life, years	10 years
Vivint Smart Home | Customer relationships
Other Assets
Intangible assets, net	$ 1,740,000,000
Other Liabilities
Weighted average useful life, years	12 years
Vivint Smart Home | Technology
Other Assets
Intangible assets, net	$ 860,000,000
Other Liabilities
Weighted average useful life, years	5 years
Vivint Smart Home | Trade name
Other Assets
Intangible assets, net	$ 160,000,000
Other Liabilities
Weighted average useful life, years	10 years
Vivint Smart Home | Sales channel contract
Other Assets
Intangible assets, net	$ 10,000,000

Acquisitions and Dispositions_4

Acquisitions and Dispositions - Measurement Period Adjustments (Details) - Vivint Smart Home $ in Millions	3 Months Ended
	Jun. 30, 2023 USD ($)
Business Acquisition [Line Items]
Goodwill	$ (200)
Intangible assets, net	270
Deferred income taxes	(70)
Net change in assets	$ 0

Acquisitions and Dispositions_5

Acquisitions and Dispositions - Supplemental Pro Forma Financial Information (Details) - Vivint Smart Home - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Business Acquisition [Line Items]
Total operating revenues	$ 6,348	$ 7,690	$ 14,356	$ 15,978
Net income/(loss)	$ 342	$ 466	$ (955)	$ 2,018

Acquisitions and Dispositions_6

Acquisitions and Dispositions - Dispositions (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
	Jan. 06, 2023	Jun. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale			$ 3	$ 32	$ 202	$ 29
Watson Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest		49%
Proceeds from sale of investment		$ 59
West/Services/Other | Watson Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale		$ 46
Held-for-sale | Forecast | Subsequent Event | STP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest							44%
Cash consideration							$ 1,750
Disposal Group, Disposed of by Sale, Not Discontinued Operations | East
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of land and related assets	$ 212
Transaction fees	3
Gain on sale	$ 199

Acquisitions and Dispositions_7

Acquisitions and Dispositions - Held For Sale (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets - held-for-sale	$ 75		$ 75		$ 0
Non-current assets - held-for-sale	1,161		1,161		5
Total assets held-for-sale	1,236		1,236
Current liabilities - held-for-sale	36		36		4
Non-current liabilities - held-for-sale	947		947		$ 31
Income before income taxes	5	$ 4	10	$ (11)
Held-for-sale | STP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory	63		63
Prepayments and other current assets	12		12
Current assets - held-for-sale	75		75
Property, plant and equipment, net	227		227
Intangible assets, net	12		12
Nuclear decommissioning trust fund	922		922
Non-current assets - held-for-sale	1,161		1,161
Current liabilities - held-for-sale	36		36
Nuclear decommissioning reserve	336		336
Nuclear decommissioning trust liability	551		551
Other non-current liabilities	60		60
Non-current liabilities - held-for-sale	947		947
Total liabilities held-for-sale	983		983
Income before income taxes	$ 23	$ 121	$ 7	$ 156

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Estimated Carrying Amounts and Fair Value of Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	$ 12,266	$ 8,100
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	12,110	8,098
Carrying Amount | Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	575	575
Carrying Amount | Other long-term debt, including current portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	11,535	7,523
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	11,181	7,008
Fair Value | Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	618	576
Fair Value | Other long-term debt, including current portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	$ 10,563	$ 6,432

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Fair Value Hierarchy for Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	$ 12,266	$ 8,100
Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	10,481	7,008
Level 2 | Convertible Senior Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	618	576
Level 2 | Other long-term debt, including current portion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	9,863	6,432
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	700	0
Level 3 | Convertible Senior Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	0	0
Level 3 | Other long-term debt, including current portion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total long-term debt, including current portion	$ 700	$ 0

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	$ 19	$ 19
Other trust fund investments (classified within other non-current assets):
U.S. government and federal agency obligations		1
Measured using net asset value practical expedient:
Total assets	8,280	12,858
Derivative liabilities:
Derivative contracts	5,721	8,441
Foreign exchange
Derivative assets:
Derivative contracts	8	18
Derivative liabilities:
Derivative contracts	6	2
Commodity contracts
Derivative assets:
Derivative contracts	7,301	11,976
Derivative liabilities:
Derivative contracts	5,600	8,439
Interest rate contracts
Derivative assets:
Derivative contracts	24
Consumer Financing Program
Derivative liabilities:
Derivative contracts	115
Cash and cash equivalents
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	21	15
U.S. government and federal agency obligations
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	90	86
Federal agency mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	103	101
Commercial mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	34	35
Corporate debt securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	116	114
Equity securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	464	403
Measured using net asset value practical expedient:
Equity securities	6	6
Foreign government fixed income securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	1	1
Equity securities — nuclear trust fund investments (classified within non-current assets - held-for-sale)
Measured using net asset value practical expedient:
Equity securities	93	83
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 (classified within other non-current assets):
U.S. government and federal agency obligations		1
Measured using net asset value practical expedient:
Total assets	1,798	2,432
Derivative liabilities:
Derivative contracts	1,072	1,244
Level 1 | Foreign exchange
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 1 | Commodity contracts
Derivative assets:
Derivative contracts	1,225	1,929
Derivative liabilities:
Derivative contracts	1,072	1,244
Level 1 | Interest rate contracts
Derivative assets:
Derivative contracts	0
Level 1 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	0
Level 1 | Cash and cash equivalents
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	21	15
Level 1 | U.S. government and federal agency obligations
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	88	84
Level 1 | Federal agency mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 1 | Commercial mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 1 | Corporate debt securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 1 | Equity securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	464	403
Level 1 | Foreign government fixed income securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
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)	19	19
Other trust fund investments (classified within other non-current assets):
U.S. government and federal agency obligations		0
Measured using net asset value practical expedient:
Total assets	4,871	9,086
Derivative liabilities:
Derivative contracts	3,927	6,451
Level 2 | Foreign exchange
Derivative assets:
Derivative contracts	8	18
Derivative liabilities:
Derivative contracts	6	2
Level 2 | Commodity contracts
Derivative assets:
Derivative contracts	4,564	8,796
Derivative liabilities:
Derivative contracts	3,921	6,449
Level 2 | Interest rate contracts
Derivative assets:
Derivative contracts	24
Level 2 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	0
Level 2 | Cash and cash equivalents
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 2 | U.S. government and federal agency obligations
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	2	2
Level 2 | Federal agency mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	103	101
Level 2 | Commercial mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	34	35
Level 2 | Corporate debt securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	116	114
Level 2 | Equity securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 2 | Foreign government fixed income securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	1	1
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 (classified within other non-current assets):
U.S. government and federal agency obligations		0
Derivative assets:
Derivative contracts	1,512	1,251
Measured using net asset value practical expedient:
Total assets	1,512	1,251
Derivative liabilities:
Derivative contracts	722	746
Level 3 | Foreign exchange
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 3 | Commodity contracts
Derivative assets:
Derivative contracts	1,512	1,251
Derivative liabilities:
Derivative contracts	607	746
Level 3 | Interest rate contracts
Derivative assets:
Derivative contracts	0
Level 3 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	115
Level 3 | Cash and cash equivalents
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | U.S. government and federal agency obligations
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | Federal agency mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | Commercial mortgage-backed securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | Corporate debt securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | Equity securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	0	0
Level 3 | Foreign government fixed income securities
Nuclear trust fund investments (classified within non-current assets - held-for-sale):
Nuclear trust fund investments	$ 0	$ 0

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - Derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 471	$ 528	$ 505	$ 293
Total (losses)/gains realized/unrealized included in earnings	(86)	293	(177)	459
Purchases	99	6	140	29
Transfers into Level 3	414	568	438	621
Transfers out of Level 3	7	8	(1)	1
Ending balance	905	1,403	905	1,403
(Losses)/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	$ (76)	$ 297	$ (131)	$ 534

Fair Value of Financial Instr_7

Fair Value of Financial Instruments - Contractual Obligations From the Consumer Financing Program (Details) - Level 3 - Derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 471	$ 528	$ 505	$ 293
New contractual obligations	(99)	(6)	(140)	(29)
Total losses included in earnings	86	(293)	177	(459)
Ending balance	905	$ 1,403	905	$ 1,403
Consumer Financing Program
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	111		0
Contracts added from Vivint acquisition	0		112
New contractual obligations	20		22
Settlements	(19)		(22)
Total losses included in earnings	3		3
Ending balance	$ 115		$ 115

Fair Value of Financial Instr_8

Fair Value of Financial Instruments - Derivative Fair Value Measurements, Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Total derivative assets valued with prices provided by models and other valuation techniques (as a percent)	21%
Total derivative liabilities valued with prices provided by models and other valuation techniques (as a percent)	13%
Change in credit reserve	$ 8	$ 9

Fair Value of Financial Instr_9

Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Jun. 30, 2023 USD ($) $ / MWh	Dec. 31, 2022 USD ($) $ / MWh
Liabilities
Derivative liabilities	$ 5,721	$ 8,441
Commodity contracts
Assets
Derivative assets	7,301	11,976
Liabilities
Derivative liabilities	5,600	8,439
Interest rate contracts
Assets
Derivative assets	24
Level 3
Assets
Derivative assets	1,512	1,251
Liabilities
Derivative liabilities	722	746
Level 3 | Commodity contracts
Assets
Derivative assets	1,512	1,251
Liabilities
Derivative liabilities	607	746
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	105	340
Liabilities
Derivative liabilities	$ 123	$ 448
Level 3 | Commodity contracts | Natural Gas Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	1,000,000	2
Level 3 | Commodity contracts | Natural Gas Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	17,000,000	48
Level 3 | Commodity contracts | Natural Gas Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	4	6
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 1,373	$ 843
Liabilities
Derivative liabilities	$ 427	$ 216
Level 3 | Commodity contracts | Power Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	1,000,000	3
Level 3 | Commodity contracts | Power Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	263,000,000	431
Level 3 | Commodity contracts | Power Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	47	48
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 34	$ 68
Liabilities
Derivative liabilities	$ 57	$ 82
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	(23,000,000)	(32)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	146,000,000	610
Level 3 | Commodity contracts | FTRs | Weighted Average | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	1	0
Level 3 | Interest rate contracts
Assets
Derivative assets	$ 0
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0600
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.3600
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0264
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1020
Level 3 | Interest rate contracts | Consumer financing program
Assets
Derivative assets	$ 0
Liabilities
Derivative liabilities	$ 115
Level 3 | Interest rate contracts | Consumer financing program | Low | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0151
Level 3 | Interest rate contracts | Consumer financing program | High | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.7659
Level 3 | Interest rate contracts | Consumer financing program | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0586

Fair Value of Financial Inst_10

Fair Value of Financial Instruments - Counterparty Credit Risk (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Concentration of Credit Risk
Counterparty credit exposure to a portion of the Company's counterparties	$ 1,900
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties	616
Net counterparty credit exposure to a portion of the Company's counterparties	$ 1,300
Company's exposure before collateral expected to roll off (as a percent)	59%
Net exposure (as a percent)	100%
Counterparty credit risk exposure to certain counterparties, threshold (as a percent)	10%
Estimated counterparty credit risk exposure under certain long term agreements for the next 5 years	$ 889
Period of estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements (in years)	5 years
Investment grade
Concentration of Credit Risk
Net exposure (as a percent)	55%
Non-Investment grade/Non-Rated
Concentration of Credit Risk
Net exposure (as a percent)	45%
Utilities, energy merchants, marketers and other
Concentration of Credit Risk
Net exposure (as a percent)	73%
Financial Institutions
Concentration of Credit Risk
Net exposure (as a percent)	27%

Nuclear Decommissioning Trust_3

Nuclear Decommissioning Trust Fund - Narrative (Details)	Jun. 30, 2023
STP
Nuclear decommissioning trust fund
Ownership interest as percentage	44%

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, 2023	Dec. 31, 2022
Nuclear decommissioning trust fund
Fair Value	$ 0	$ 838
Unrealized Gains		346
Unrealized Losses		36
Held-for-sale
Nuclear decommissioning trust fund
Fair Value	922
Unrealized Gains	409
Unrealized Losses	27
Cash and cash equivalents
Nuclear decommissioning trust fund
Fair Value		15
Unrealized Gains		0
Unrealized Losses		0
Cash and cash equivalents | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	21
Unrealized Gains	0
Unrealized Losses	$ 0
U.S. government and federal agency obligations
Nuclear decommissioning trust fund
Fair Value		86
Unrealized Gains		0
Unrealized Losses		$ 5
Weighted-average Maturities (In years)	12 years	11 years
U.S. government and federal agency obligations | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	$ 90
Unrealized Gains	1
Unrealized Losses	$ 5
Federal agency mortgage-backed securities
Nuclear decommissioning trust fund
Fair Value		$ 101
Unrealized Gains		0
Unrealized Losses		$ 11
Weighted-average Maturities (In years)	25 years	26 years
Federal agency mortgage-backed securities | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	$ 103
Unrealized Gains	0
Unrealized Losses	$ 8
Commercial mortgage-backed securities
Nuclear decommissioning trust fund
Fair Value		$ 35
Unrealized Gains		0
Unrealized Losses		$ 4
Weighted-average Maturities (In years)	29 years	30 years
Commercial mortgage-backed securities | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	$ 34
Unrealized Gains	0
Unrealized Losses	$ 4
Corporate debt securities
Nuclear decommissioning trust fund
Fair Value		$ 114
Unrealized Gains		0
Unrealized Losses		$ 13
Weighted-average Maturities (In years)	12 years	12 years
Corporate debt securities | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	$ 116
Unrealized Gains	0
Unrealized Losses	10
Equity securities
Nuclear decommissioning trust fund
Fair Value		$ 486
Unrealized Gains		346
Unrealized Losses		3
Equity securities | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	557
Unrealized Gains	408
Unrealized Losses	$ 0
Foreign government fixed income securities
Nuclear decommissioning trust fund
Fair Value		1
Unrealized Gains		0
Unrealized Losses		$ 0
Weighted-average Maturities (In years)	20 years	17 years
Foreign government fixed income securities | Held-for-sale
Nuclear decommissioning trust fund
Fair Value	$ 1
Unrealized Gains	0
Unrealized Losses	$ 0

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, 2023	Jun. 30, 2022
Regulated Operations [Abstract]
Realized gains	$ 6	$ 8
Realized losses	(10)	(11)
Proceeds from sale of securities	$ 180	$ 278

Accounting for Derivative Ins_3

Accounting for Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Net unrealized losses on open positions related to economic hedges	$ (180)	$ (868)	$ 893	$ (3,613)
Revolving Credit Facility
Derivative [Line Items]
Outstanding borrowing	400		400
Interest Rate Swap | Term Loan
Derivative [Line Items]
Derivative, notional amount	$ 1,000		$ 1,000

Accounting for Derivative Ins_4

Accounting for Derivative Instruments and Hedging Activities - Net Notional Volume Buy/Sell of Open Derivative Transactions (Details) - Long certificate in Millions, bbl in Millions, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) MWh MMBTU certificate T bbl	Dec. 31, 2022 USD ($) MWh MMBTU certificate T bbl
Emissions
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	0	1
Renewable Energy Certificates
Volumetric Underlying Derivative Transactions
Derivative, non-monetary notional amount (in shares) | certificate	13	15
Coal
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	12	11
Natural Gas
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU	804	422
Oil
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount (in barrels) | bbl	0	1
Power
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MWh	210	192
Consumer Financing Program
Volumetric Underlying Derivative Transactions
Derivative, notional amount	$ 942	$ 0
Foreign Exchange
Volumetric Underlying Derivative Transactions
Derivative, notional amount	590	569
Interest
Volumetric Underlying Derivative Transactions
Derivative, notional amount	$ 1,400	$ 0

Accounting for Derivative Ins_5

Accounting for Derivative Instruments and Hedging Activities - Fair Value within the Derivative Instrument Valuation (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative Liabilities	$ 5,721	$ 8,441
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Assets	7,333	11,994
Derivative Liabilities	5,721	8,441
Not Designated as Hedging Instrument | Interest rate contracts current
Derivative [Line Items]
Derivative Assets	20	0
Derivative Liabilities	0	0
Not Designated as Hedging Instrument | Interest rate contracts long-term
Derivative [Line Items]
Derivative Assets	4	0
Derivative Liabilities	0	0
Not Designated as Hedging Instrument | Foreign exchange contracts - current
Derivative [Line Items]
Derivative Assets	5	11
Derivative Liabilities	3	1
Not Designated as Hedging Instrument | Foreign exchange contracts - long-term
Derivative [Line Items]
Derivative Assets	3	7
Derivative Liabilities	3	1
Not Designated as Hedging Instrument | Consumer Financing Program - short-term
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	78	0
Not Designated as Hedging Instrument | Consumer Financing Program - long-term
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	37	0
Not Designated as Hedging Instrument | Commodity contracts - current
Derivative [Line Items]
Derivative Assets	4,398	7,875
Derivative Liabilities	3,751	6,194
Not Designated as Hedging Instrument | Commodity contracts - long-term
Derivative [Line Items]
Derivative Assets	2,903	4,101
Derivative Liabilities	$ 1,849	$ 2,245

Accounting for Derivative Ins_6

Accounting for Derivative Instruments and Hedging Activities - Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash collateral received in support of energy risk management activities	$ (365)	$ (1,708)
Derivative liabilities	(5,721)	(8,441)
Cash Collateral Posted	270	260
Total Derivative Contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Gross Amounts of Recognized Assets / Liabilities	1,612	3,553
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(335)	(1,639)
Net Amount	1,277	1,914
Foreign exchange
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	8	18
Derivative Instruments	(5)	(2)
Cash collateral received in support of energy risk management activities	0	0
Net Amount	3	16
Derivative liabilities	(6)	(2)
Derivative Instruments	5	2
Cash Collateral Posted	0	0
Net Amount	(1)	0
Gross Amounts of Recognized Assets / Liabilities	2	16
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	2	16
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	7,301	11,976
Derivative Instruments	(5,344)	(7,897)
Cash collateral received in support of energy risk management activities	(340)	(1,659)
Net Amount	1,617	2,420
Derivative liabilities	(5,600)	(8,439)
Derivative Instruments	5,344	7,897
Cash Collateral Posted	5	20
Net Amount	(251)	(522)
Gross Amounts of Recognized Assets / Liabilities	1,701	3,537
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(335)	(1,639)
Net Amount	1,366	$ 1,898
Consumer Financing Program
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative liabilities	(115)
Derivative Instruments	0
Cash Collateral Posted	0
Net Amount	(115)
Interest rate contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	24
Derivative Instruments	0
Cash collateral received in support of energy risk management activities	0
Net Amount	$ 24

Accounting for Derivative Ins_7

Accounting for Derivative Instruments and Hedging Activities - Pre-tax Effects of Economic Hedges Not Designated as Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Unrealized mark-to-market results
Reversal of previously recognized unrealized (gains) on settled positions related to economic hedges	$ (151)	$ (197)	$ (997)	$ (605)
Reversal of acquired loss/(gain) positions related to economic hedges	35	48	10	(12)
Net unrealized gains/(losses) on open positions related to economic hedges	180	868	(893)	3,613
Total unrealized mark-to-market gains/(losses) for economic hedging activities	64	719	(1,880)	2,996
Reversal of previously recognized unrealized losses on settled positions related to trading activity	10	8	11	9
Net unrealized gains/(losses) on open positions related to trading activity	3	(10)	14	(25)
Total unrealized mark-to-market gains/(losses) for trading activity	13	(2)	25	(16)
Total unrealized gains/(losses) - commodities and foreign exchange	77	717	(1,855)	2,980
Credit Risk Related Contingent Features
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	91		91
Additional collateral required	15		15
Adequate Assurance Clauses
Credit Risk Related Contingent Features
Derivative net liability position, collateral required for contracts with credit rating contingent feature	743		743
Commodities | Operating revenues
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	88	(150)	191	(297)
Commodities | Cost of operations
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	5	858	(2,032)	3,272
Foreign exchange | Cost of operations
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	(16)	9	(14)	5
Commodities and foreign exchange
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	77	717	(1,855)	2,980
Consumer financing program
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	(3)	0	(3)	0
Interest rate contracts
Unrealized mark-to-market results
Total unrealized gains/(losses) - commodities and foreign exchange	$ 29	$ 0	$ 24	$ 0

Impairments (Details)

Impairments (Details) - East $ in Millions	3 Months Ended
	Jun. 30, 2022 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Generating assets impairment loss	$ 20
Goodwill impairment loss	$ 130

Long-term Debt and Finance Le_3

Long-term Debt and Finance Leases - Schedule of Long-term Debt and Finance Leases (Details) $ / shares in Units, $ in Millions		6 Months Ended
	Jul. 31, 2023 $ / shares	Jun. 30, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 12,266	$ 8,100
Finance leases		19	11
Subtotal long-term debt and finance leases (including current maturities)		12,285	8,111
Less current maturities		(1,319)	(63)
Less debt issuance costs		(73)	(70)
Discounts		(156)	(2)
Total long-term debt and finance leases		10,737	7,976
Recourse Debt
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		9,540	8,100
Recourse Debt | Senior Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 375	375
Interest rate, stated percentage		6.625%
Recourse Debt | Senior Notes, due 2028
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 821	821
Interest rate, stated percentage		5.75%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 733	733
Interest rate, stated percentage		5.25%
Recourse Debt | Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 500	500
Interest rate, stated percentage		3.375%
Recourse Debt | Senior Notes, due 2031
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 1,030	1,030
Interest rate, stated percentage		3.625%
Recourse Debt | Senior Notes, due 2032
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 1,100	1,100
Interest rate, stated percentage		3.875%
Recourse Debt | Convertible Senior Notes due 2048
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 575	575
Interest rate, stated percentage		2.75%
Convertible notes, conversion price (in usd per share) | $ / shares		$ 42.57
Conversion rate		0.0234925
Recourse Debt | Convertible Senior Notes due 2048 | Subsequent Event
Debt Instrument [Line Items]
Convertible notes, conversion price (in usd per share) | $ / shares	$ 42.17
Conversion rate	0.0237112
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 600	600
Interest rate, stated percentage		3.75%
Recourse Debt | Senior Secured First Lien Notes, due 2025
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 500	500
Interest rate, stated percentage		2%
Recourse Debt | Senior Secured First Lien Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 900	900
Interest rate, stated percentage		2.45%
Recourse Debt | Senior Secured First Lien Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 500	500
Interest rate, stated percentage		4.45%
Recourse Debt | Senior Secured First Lien Notes, due 2033
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 740	0
Interest rate, stated percentage		7%
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 466	466
Recourse Debt | Tax-exempt bonds | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage		1.25%
Recourse Debt | Tax-exempt bonds | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage		4.75%
Line of Credit | Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 700	0
Non Recourse Debt
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		2,726	0
Non Recourse Debt | Vivint Smart Home Senior Secured Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 600	0
Interest rate, stated percentage		6.75%
Non Recourse Debt | Vivint Smart Home Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 800	0
Interest rate, stated percentage		5.75%
Non Recourse Debt | Vivint Smart Home Senior Secured Term Loan, due 2028
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 1,326	$ 0

Long-term Debt and Finance Le_4

Long-term Debt and Finance Leases - Senior Notes (Details) - USD ($)	Jun. 30, 2023	Mar. 09, 2023	Dec. 31, 2022
Senior Notes | Senior Secured First Lien Notes, due 2033
Debt Instrument [Line Items]
Debt issuance amount		$ 740,000,000
Interest rate, stated percentage		7%
Recourse Debt | Senior Secured First Lien Notes, due 2033
Debt Instrument [Line Items]
Interest rate, stated percentage	7%
Recourse Debt | Convertible Senior Notes due 2048
Debt Instrument [Line Items]
Interest rate, stated percentage	2.75%
Convertible notes, conversion price (in usd per share)	$ 42.57
Convertible notes, carrying amount	$ 571,000,000		$ 570,000,000

Long-term Debt and Finance Le_5

Long-term Debt and Finance Leases - Interest Expense in Connection with Convertible Senior Notes, due 2048 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Instrument [Line Items]
Amortization of financing costs and debt discounts			$ 31	$ 11
Convertible Senior Notes due 2048 | Recourse Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 4	$ 4	8	8
Amortization of financing costs and debt discounts	0	1	1	1
Total	$ 4	$ 5	$ 9	$ 9
Effective Interest Rate	0.75%	0.76%	1.52%	1.52%

Long-term Debt and Finance Le_6

Long-term Debt and Finance Leases - Revolving Credit Facility, Bilateral Letter of Credit Facilities, Receivables Securitization Facilities and Dunkirk Bonds (Details) - USD ($)	May 30, 2023	May 19, 2023	Mar. 13, 2023	Feb. 14, 2023	Jul. 31, 2023	Jun. 30, 2023	Jun. 22, 2023	Jun. 21, 2023	Apr. 03, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Borrowings outstanding						$ 12,266,000,000				$ 8,100,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding borrowing						400,000,000
Bilateral Credit Facilities | Secured Debt
Line of Credit Facility [Line Items]
Increase to existing revolving commitments	$ 100,000,000	$ 25,000,000
Dunkirk Bonds
Line of Credit Facility [Line Items]
Borrowings outstanding									$ 59,000,000
Interest rate, stated percentage									4.25%
Revolving Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Increase to existing revolving commitments			$ 45,000,000	$ 600,000,000
Outstanding borrowing						700,000,000
Revolving Credit Facility | Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Outstanding borrowing					$ 700,000,000
Revolving Credit Facility | Receivables Facility
Line of Credit Facility [Line Items]
Outstanding borrowing						0
Revolving credit commitments							$ 1,400,000,000	$ 1,000,000,000
Letter of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Letters of credit issued						823,000,000
Letter of Credit | Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Letters of credit issued					$ 879,000,000
Letter of Credit | Bilateral Credit Facilities | Secured Debt
Line of Credit Facility [Line Items]
Letters of credit issued						589,000,000
Revolving credit commitments	$ 800,000,000
Letter of Credit | Receivables Facility
Line of Credit Facility [Line Items]
Letters of credit issued						$ 842,000,000

Long-term Debt and Finance Le_7

Long-term Debt and Finance Leases - Vivint Smart Home Acquired Debt (Details) - USD ($)	Jun. 30, 2023	Mar. 10, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings outstanding	$ 12,266,000,000		$ 8,100,000,000
Vivint Credit Agreement | Term Loan
Debt Instrument [Line Items]
Borrowings outstanding	1,300,000,000
Vivint Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings outstanding	0
Letters of credit issued	10,000,000
Vivint Credit Agreement | Vivint Smart Home | Term Loan
Debt Instrument [Line Items]
Revolving credit commitments		$ 1,400,000,000
Vivint Credit Agreement | Vivint Smart Home | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit commitments		$ 370,000,000
Non Recourse Debt
Debt Instrument [Line Items]
Borrowings outstanding	$ 2,726,000,000		0
Non Recourse Debt | Vivint Smart Home Senior Secured Notes, due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	6.75%
Borrowings outstanding	$ 600,000,000		0
Non Recourse Debt | Vivint Smart Home Senior Secured Notes, due 2027 | Vivint Smart Home
Debt Instrument [Line Items]
Interest rate, stated percentage	6.75%	6.75%
Borrowings outstanding	$ 600,000,000
Non Recourse Debt | Vivint Smart Home Senior Notes, due 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Borrowings outstanding	$ 800,000,000		$ 0
Non Recourse Debt | Vivint Smart Home Senior Notes, due 2029 | Vivint Smart Home
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%
Borrowings outstanding	$ 800,000,000

Investments Accounted for Usi_3

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs - Summarized Financial Information (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments Accounted for by the Equity Method
Accounts receivable and Other current assets	$ 10,121	$ 16,231
Current liabilities	9,876	12,982
Variable Interest Entity, Primary Beneficiary
Investments Accounted for by the Equity Method
Accounts receivable and Other current assets	1,256	2,108
Current liabilities	152	152
Net assets	$ 1,104	$ 1,956

Changes in Capital Structure -

Changes in Capital Structure - Narrative (Details) - USD ($)			1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 27, 2023	Apr. 01, 2023	Jul. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)				10,000,000		10,000,000	10,000,000
Common stock, shares authorized (in shares)				500,000,000		500,000,000	500,000,000
ESPP, minimum percentage of eligible compensation to purchase shares						1%
ESPP, maximum percentage of eligible compensation						10%
ESPP, exercise price as percentage of fair value		90%			95%	90%
ESPP, increase, shares available for issuance (in shares)	4,400,000
Subsequent Event
Class of Stock [Line Items]
Shares repurchased (in shares)			1,322,141
Capital Allocation Plan, 2023
Class of Stock [Line Items]
Capital allocation policy, target allocation, percentage of cash available for allocation after debt reduction to be returned to shareholders				80%
Stock repurchase program, authorized amount				$ 2,700,000,000		$ 2,700,000,000
Capital Allocation Plan, 2023 | Subsequent Event
Class of Stock [Line Items]
Shares repurchased (in shares)			1,322,141
Amounts paid for shares purchased			$ 50,000,000
Average price paid per share and share equivalent (in usd per share)			$ 37.82

Changes in Capital Structure _2

Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares		1 Months Ended	6 Months Ended
	Mar. 09, 2023	Jul. 31, 2023	Jun. 30, 2023
Schedule of Stock by Class, Equity [Roll Forward]
Common, Balance as of beginning of period (in shares)		424,675,214	423,897,001
Treasury, Balance as of end of period (in shares)		(194,249,455)	(194,335,971)
Common, Outstanding, as of beginning of period (in shares)		230,425,759	229,561,030
Preferred, Balance as of end of period (in shares)			650,000
Common, Balance as of end of period (in shares)			424,675,214
Treasury, Balance as of end of period (in shares)			(194,249,455)
Preferred, Outstanding as of end of period (in shares)			650,000
Common, Outstanding, as of end of period (in shares)			230,425,759
Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares repurchased (in shares)		(1,322,141)
Common, Outstanding, as of end of period (in shares)		229,117,430
Shares issued under LTIPs
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)			778,213
Shares issued under LTIPs | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)		13,812
Shares issued under ESPP
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)			86,516
Preferred Stock
Schedule of Stock by Class, Equity [Roll Forward]
Preferred, Balance as of end of period (in shares)			650,000
Preferred, Outstanding as of end of period (in shares)			650,000
Preferred Stock | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Preferred, Balance as of end of period (in shares)		650,000
Preferred, Outstanding as of end of period (in shares)		650,000
Preferred Stock | Series A Preferred Stock
Schedule of Stock by Class, Equity [Roll Forward]
Issuance of Series A Preferred Stock (in shares)	650,000		650,000
Common Stock
Schedule of Stock by Class, Equity [Roll Forward]
Common, Balance as of beginning of period (in shares)		424,675,214	423,897,001
Common, Balance as of end of period (in shares)			424,675,214
Common Stock | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares repurchased (in shares)		0
Common, Balance as of end of period (in shares)		424,689,026
Common Stock | Shares issued under LTIPs
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)			778,213
Common Stock | Shares issued under LTIPs | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)		13,812
Common Stock | Shares issued under ESPP
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)			0
Treasury Stock
Schedule of Stock by Class, Equity [Roll Forward]
Treasury, Balance as of end of period (in shares)		(194,249,455)	(194,335,971)
Treasury, Balance as of end of period (in shares)			(194,249,455)
Treasury Stock | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares repurchased (in shares)		(1,322,141)
Treasury, Balance as of end of period (in shares)		(195,571,596)
Treasury Stock | Shares issued under LTIPs
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)			0
Treasury Stock | Shares issued under LTIPs | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)		0
Treasury Stock | Shares issued under ESPP
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)			86,516

Changes in Capital Structure _3

Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended				12 Months Ended
	Jul. 17, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)			$ 1.51			$ 1.40
Dividends per common share (in usd per share)		$ 0.3775	$ 0.3775	$ 0.35	$ 0.35
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.3775
Minimum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			7%
Maximum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			9%

Changes in Capital Structure _4

Changes in Capital Structure - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Mar. 09, 2023	Jun. 30, 2023	Jun. 30, 2022
Class of Stock [Line Items]
Proceeds from issuance of preferred stock		$ 635	$ 0
Series A Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Issuance of Series A Preferred Stock (in shares)	650,000	650,000
Preferred stock, dividend rate, percentage	10.25%
Proceeds from issuance of preferred stock	$ 635
Series A Preferred Stock | Preferred Stock | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Preferred stock, dividend rate, floor	1%
Preferred stock, dividend rate, basis spread on variable rate	5.92%
Preferred stock, liquidation preference (in usd per share)	$ 1,000

Income_(Loss) Per Share - Basic

Income/(Loss) Per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic income/(loss) per share:
Net income/(loss)	$ 308	$ (1,335)	$ 513	$ 1,736	$ (1,027)	$ 2,249
Less: Cumulative dividends attributable to Series A Preferred Stock	17		0		21	0
Net Income/(Loss) Available to Common Stockholders, basic	$ 291		$ 513		$ (1,048)	$ 2,249
Weighted average number of common shares outstanding — basic (in shares)	231,000		237,000		230,000	240,000
Income/(loss) per weighted average common share — basic (in usd per share)	$ 1.26		$ 2.16		$ (4.56)	$ 9.37
Diluted income/(loss) per share:
Net income/(loss)	$ 308	$ (1,335)	$ 513	$ 1,736	$ (1,027)	$ 2,249
Less: Cumulative dividends attributable to Series A Preferred Stock	17		0		21	0
Net Income/(Loss) Available to Common Stockholders, diluted	$ 291		$ 513		$ (1,048)	$ 2,249
Weighted average number of common shares outstanding — basic (in shares)	231,000		237,000		230,000	240,000
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	1,000		0		0	0
Weighted average number of common shares outstanding — diluted (in shares)	232,000		237,000		230,000	240,000
Income/(loss) per weighted average common share — diluted (in usd per share)	$ 1.25		$ 2.16		$ (4.56)	$ 9.37

Income_(Loss) Per Share - Summa

Income/(Loss) Per Share - Summary of Outstanding Equity Instruments that are Anti-dilutive and Excluded from the Computation of Diluted Income/(loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Antidilutive securities (in shares)	1,000	0	7,000	0

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information
Revenues	$ 6,348	$ 7,282	$ 14,070	$ 15,178
Depreciation and amortization	315	157	505	340
Impairment losses	0	155	0	155
Gain (loss) on sale of assets	3	32	202	29
Equity in earnings/(losses) of unconsolidated affiliates	5	4	10	(11)
Income/(loss) before income taxes	397	665	(1,274)	2,972
Net income /(loss)	308	513	(1,027)	2,249
Corporate
Segment Reporting Information
Revenues	0	0	0	0
Depreciation and amortization	9	8	18	16
Impairment losses		0		0
Gain (loss) on sale of assets	0	0	0	(2)
Equity in earnings/(losses) of unconsolidated affiliates	0	0	0	0
Income/(loss) before income taxes	(137)	(119)	(300)	(250)
Net income /(loss)	(224)	(261)	(98)	(964)
Eliminations
Segment Reporting Information
Revenues	(6)	0	(16)	17
Depreciation and amortization	0	0	0	0
Impairment losses		0		0
Gain (loss) on sale of assets	0	0	0	0
Equity in earnings/(losses) of unconsolidated affiliates	0	0	0	0
Income/(loss) before income taxes	0	0	0	0
Net income /(loss)	0	0	0	0
Texas | Operating Segments
Segment Reporting Information
Revenues	2,515	2,692	4,549	4,712
Depreciation and amortization	73	77	148	154
Impairment losses		0		0
Gain (loss) on sale of assets	0	(12)	0	(12)
Equity in earnings/(losses) of unconsolidated affiliates	0	0	0	(1)
Income/(loss) before income taxes	785	762	1,069	1,533
Net income /(loss)	785	762	1,069	1,533
East | Operating Segments
Segment Reporting Information
Revenues	2,503	3,514	6,679	8,229
Depreciation and amortization	30	50	60	127
Impairment losses		155		155
Gain (loss) on sale of assets	3	0	202	0
Equity in earnings/(losses) of unconsolidated affiliates	0	0	0	0
Income/(loss) before income taxes	(100)	(13)	(1,502)	1,525
Net income /(loss)	(101)	(12)	(1,503)	1,526
West/Services/Other | Operating Segments
Segment Reporting Information
Revenues	892	1,076	2,266	2,220
Depreciation and amortization	23	22	47	43
Impairment losses		0		0
Gain (loss) on sale of assets	0	44	0	43
Equity in earnings/(losses) of unconsolidated affiliates	5	4	10	(10)
Income/(loss) before income taxes	(128)	35	(479)	164
Net income /(loss)	(129)	$ 24	(433)	$ 154
Vivint Smart Home | Operating Segments
Segment Reporting Information
Revenues	444		592
Depreciation and amortization	180		232
Gain (loss) on sale of assets	0		0
Equity in earnings/(losses) of unconsolidated affiliates	0		0
Income/(loss) before income taxes	(23)		(62)
Net income /(loss)	$ (23)		$ (62)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Effective Tax Rate
Income/(Loss) before income taxes	$ 397	$ 665	$ (1,274)	$ 2,972
Income tax expense/(benefit)	$ 89	$ 152	$ (247)	$ 723
Effective income tax rate	22.40%	22.90%	19.40%	24.30%
Uncertain Tax Benefits
Non-current tax liability for uncertain tax benefits	$ 45		$ 45
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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Revenue	$ 6,348	$ 7,282	$ 14,070	$ 15,178
Related Party
Related Party Transaction [Line Items]
Revenue	22	10	58	26
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	0	0	1	1
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	21	9	55	22
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 1	$ 2	$ 3

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Feb. 28, 2023 USD ($)	Jul. 31, 2023	Jun. 30, 2023 case facility	Oct. 31, 2021 facility	Jun. 30, 2019 facility
Loss Contingencies
Number of facilities | facility			2	2
Pending Litigation
Loss Contingencies
Pending lawsuits			3
Sierra Club Et Al V. Midwest Generation LLC
Loss Contingencies
Number of facilities | facility					4
Direct Energy vs. Stanley, Forte, Schafer and Lane
Loss Contingencies
Pending lawsuits			2
Direct Energy vs. Burk and Dickson
Loss Contingencies
Pending lawsuits			2
CPI Security Systems, Inc.
Loss Contingencies
Damages awarded | $	$ 50
Punitive damages awarded | $	$ 140
Partners in STP, CPS and Austin Energy vs. NRG | Pending Litigation | STP | Subsequent Event
Loss Contingencies
Ownership interest		44%

Environmental Matters (Details)

Environmental Matters (Details) - facility	Jun. 30, 2023	Oct. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Number of plants	2	2

Uncategorized Items - nrg-20230

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2020-06 [Member]