NRG Energy (NRG) 10-Q 8 Nov 24 2024 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2024	Oct. 31, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
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		202,566,373
Entity Central Index Key	0001013871
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Revenue	$ 7,223	$ 7,946	$ 21,311	$ 22,016
Operating Costs and Expenses
Cost of operations (excluding depreciation and amortization shown below)	7,239	6,406	17,229	20,137
Depreciation and amortization	352	359	1,045	921
Impairment losses	0	0	15	0
Selling, general and administrative costs (excluding amortization of customer acquisition costs of $55, $36, $144 and $84, respectively, which are included in depreciation and amortization shown separately above)	645	602	1,739	1,502
Acquisition-related transaction and integration costs	7	18	22	111
Total operating costs and expenses	8,243	7,385	20,050	22,671
Gain on sale of assets	208	0	209	202
Operating (Loss)/Income	(812)	561	1,470	(453)
Other Income/(Expense)
Equity in earnings of unconsolidated affiliates	6	6	13	16
Other income, net	5	14	38	43
Loss on debt extinguishment	0	0	(260)	0
Interest expense	(213)	(173)	(528)	(472)
Total other expense	(202)	(153)	(737)	(413)
(Loss)/Income Before Income Taxes	(1,014)	408	733	(866)
Income tax (benefit)/expense	(247)	65	251	(182)
Net (Loss)/Income	(767)	343	482	(684)
Less: Cumulative dividends attributable to Series A Preferred Stock	17	17	51	38
Net (Loss)/Income Available to Common Stockholders, basic	(784)	326	431	(722)
Net (Loss)/Income Available for Common Stockholders, diluted	$ (784)	$ 326	$ 431	$ (722)
(Loss)/Income per Share
Weighted average number of common shares outstanding — basic (in shares)	207,000	230,000	207,000	230,000
(Loss)/Income per Weighted Average Common Share — Basic (in usd per share)	$ (3.79)	$ 1.42	$ 2.08	$ (3.14)
Weighted average number of common shares outstanding — diluted (in shares)	207,000	232,000	213,000	230,000
(Loss)/Income per Weighted Average Common Share — Diluted (in usd per share)	$ (3.79)	$ 1.41	$ 2.02	$ (3.14)

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Amortization of customer acquisition costs	$ 55	$ 36	$ 144	$ 84

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (Loss)/Income	$ (767)	$ 343	$ 482	$ (684)
Other Comprehensive (Loss)/Income
Foreign currency translation adjustments	6	(8)	(4)	0
Defined benefit plans	(8)	1	(10)	0
Other comprehensive (loss)/income	(2)	(7)	(14)	0
Comprehensive (Loss)/Income	$ (769)	$ 336	$ 468	$ (684)

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 1,104	$ 541
Funds deposited by counterparties	12	84
Restricted cash	10	24
Accounts receivable, net	3,258	3,542
Inventory	540	607
Derivative instruments	2,456	3,862
Cash collateral paid in support of energy risk management activities	449	441
Prepayments and other current assets	782	626
Total current assets	8,611	9,727
Property, plant and equipment, net	1,818	1,763
Other Assets
Equity investments in affiliates	49	42
Operating lease right-of-use assets, net	172	179
Goodwill	5,018	5,079
Derivative instruments	1,747	2,293
Deferred income taxes	2,098	2,251
Other non-current assets	1,124	777
Total other assets	13,295	14,548
Total Assets	23,724	26,038
Current Liabilities
Current portion of long-term debt and finance leases	258	620
Current portion of operating lease liabilities	77	90
Accounts payable	1,994	2,325
Derivative instruments	2,351	4,019
Cash collateral received in support of energy risk management activities	12	84
Deferred revenue current	761	720
Accrued expenses and other current liabilities	1,895	1,642
Total current liabilities	7,348	9,500
Other Liabilities
Long-term debt and finance leases	10,422	10,133
Non-current operating lease liabilities	125	128
Derivative instruments	1,469	1,488
Deferred income taxes	8	22
Deferred revenue non-current	919	914
Other non-current liabilities	913	947
Total other liabilities	13,856	13,632
Total Liabilities	21,204	23,132
Commitments and Contingencies
Stockholders' Equity
Preferred stock; 10,000,000 shares authorized; 650,000 Series A shares issued and outstanding at September 30, 2024 and December 31, 2023, aggregate liquidation preference of $650 at September 30, 2024 and December 31, 2023	650	650
Common stock; $0.01 par value; 500,000,000 shares authorized; 264,056,285 and 267,330,470 shares issued and 204,929,327 and 208,130,950 shares outstanding at September 30, 2024 and December 31, 2023, respectively	3	3
Additional paid-in-capital	3,145	3,416
Retained earnings	977	820
Treasury stock, at cost; 59,126,958 shares and 59,199,520 shares at September 30, 2024 and December 31, 2023, respectively	(2,150)	(1,892)
Accumulated other comprehensive loss	(105)	(91)
Total Stockholders' Equity	2,520	2,906
Total Liabilities and Stockholders' Equity	23,724	26,038
Customer relationships, net
Other Assets
Intangible assets, net	1,648	2,164
Other intangible assets, net
Other Assets
Intangible assets, net	$ 1,439	$ 1,763

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
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	650,000
Preferred stock, shares outstanding (in shares)	650,000	650,000
Preferred stock, liquidation preference	$ 650	$ 650
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)	264,056,285	267,330,470
Common stock, shares outstanding (in shares)	204,929,327	208,130,950
Treasury stock, shares (in shares)	59,126,958	59,199,520

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities
Net Income/(Loss)	$ 482	$ (684)
Adjustments to reconcile net income/(loss) to cash provided/(used) by operating activities:
Equity in and distributions from earnings of unconsolidated affiliates	(6)	(16)
Depreciation of property, plant and equipment and amortization of customer relationships and other intangible assets	814	813
Amortization of capitalized contract costs	231	108
Accretion of asset retirement obligations	29	14
Provision for credit losses	228	165
Amortization of nuclear fuel	0	42
Amortization of financing costs and debt discounts	32	42
Loss on debt extinguishment	260	0
Amortization of in-the-money contracts and emissions allowances	83	111
Amortization of unearned equity compensation	82	87
Net gain on sale of assets and disposal of assets	(197)	(187)
Impairment losses	15	0
Changes in derivative instruments	268	1,553
Changes in current and deferred income taxes and liability for uncertain tax benefits	134	(225)
Changes in collateral deposits in support of risk management activities	(80)	(1,188)
Changes in nuclear decommissioning trust liability	0	(4)
Changes in other working capital	(1,021)	(1,093)
Cash provided/(used) by operating activities	1,354	(462)
Cash Flows from Investing Activities
Payments for acquisitions of businesses and assets, net of cash acquired	(33)	(2,502)
Capital expenditures	(286)	(493)
Net purchases of emissions allowances	(16)	(25)
Investments in nuclear decommissioning trust fund securities	0	(293)
Proceeds from the sale of nuclear decommissioning trust fund securities	0	280
Proceeds from sales of assets, net of cash disposed	495	229
Proceeds from insurance recoveries for property, plant and equipment, net	3	173
Cash provided/(used) by investing activities	163	(2,631)
Cash Flows from Financing Activities
Proceeds from issuance of preferred stock, net of fees	0	635
Payments of dividends to preferred and common stockholders	(322)	(295)
Equivalent shares purchased in lieu of tax withholdings	(45)	(19)
Payments for share repurchase activity	(316)	(50)
Net (payments)/receipts from settlement of acquired derivatives that include financing elements	(2)	332
Net proceeds of Revolving Credit Facility and Receivable Securitization Facilities	0	300
Proceeds from issuance of long-term debt	875	731
Payments of debt issuance costs	(13)	(29)
Repayments of long-term debt and finance leases	(960)	(15)
Payments for debt extinguishment costs	(258)	0
Proceeds from credit facilities	1,050	3,020
Repayments to credit facilities	(1,050)	(3,020)
Cash (used)/provided by financing activities	(1,041)	1,590
Effect of exchange rate changes on cash and cash equivalents	1	0
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	477	(1,503)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	649	2,178
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 1,126	$ 675

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2022		$ 3,828		$ 4	$ 8,457	$ 1,408	$ (5,864)	$ (177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		(1,335)				(1,335)
Issuance of Series A Preferred Stock		636	$ 650		(14)
Other comprehensive (loss)/income		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		4	8,457	1,408	(5,864)	(177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		(684)
Other comprehensive (loss)/income		0
Ending balance at Sep. 30, 2023		3,518		4	8,527	425	(5,911)	(177)
Beginning balance at Dec. 31, 2022		3,828		4	8,457	1,408	(5,864)	(177)
Ending balance at Dec. 31, 2023		2,906	650	3	3,416	820	(1,892)	(91)
Beginning balance at Mar. 31, 2023		3,080	650	4	8,481	(15)	(5,864)	(176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		308				308
Issuance of Series A Preferred Stock		(1)			(1)
Other comprehensive (loss)/income		6						6
Shares reissuance for ESPP		4			1		3
Equity-based awards activity, net	[1]	23			23
Common stock dividends and dividend equivalents declared		(88)				(88)
Ending balance at Jun. 30, 2023		3,332	650	4	8,504	205	(5,861)	(170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		343				343
Other comprehensive (loss)/income		(7)						(7)
Share repurchases		(50)					(50)
Equity-based awards activity, net	[1]	23			23
Common stock dividends and dividend equivalents declared		(89)				(89)
Series A Preferred Stock dividends	[3]	(34)				(34)
Ending balance at Sep. 30, 2023		3,518		4	8,527	425	(5,911)	(177)
Ending balance at Dec. 31, 2023		2,906	650	3	3,416	820	(1,892)	(91)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		511				511
Other comprehensive (loss)/income		(9)						(9)
Share repurchases	[4]				117		(117)
Retirement of treasury stock	[5]				(38)		38
Equity-based awards activity, net	[6]	8			8
Common stock dividends and dividend equivalents declared	[7]	(86)				(86)
Series A Preferred Stock dividends	[8]	(33)				(33)
Ending balance at Mar. 31, 2024		3,297	650	3	3,503	1,212	(1,971)	(100)
Beginning balance at Dec. 31, 2023		2,906	650	3	3,416	820	(1,892)	(91)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		482
Other comprehensive (loss)/income		(14)
Ending balance at Sep. 30, 2024		2,520	650	3	3,145	977	(2,150)	(105)
Beginning balance at Mar. 31, 2024		3,297	650	3	3,503	1,212	(1,971)	(100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		738				738
Other comprehensive (loss)/income		(3)						(3)
Shares reissuance for ESPP		6			1		5
Share repurchases	[9]	(91)					(91)
Retirement of treasury stock	[5]				(38)		38
Equity-based awards activity, net	[6]	16			16
Common stock dividends and dividend equivalents declared	[7]	(87)				(87)
Capped Call Options	[10]	(253)			(253)
Ending balance at Jun. 30, 2024		3,623	650	3	3,229	1,863	(2,019)	(103)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income		(767)				(767)
Other comprehensive (loss)/income		(2)						(2)
Share repurchases	[9]	(231)					(231)
Retirement of treasury stock	[5]				(100)		100
Equity-based awards activity, net	[6]	16			16
Common stock dividends and dividend equivalents declared	[7]	(86)				(86)
Series A Preferred Stock dividends	[8]	(33)				(33)
Ending balance at Sep. 30, 2024		$ 2,520	$ 650	$ 3	$ 3,145	$ 977	$ (2,150)	$ (105)
[1] Includes $(3) million, $(8) million and $(8) million of equivalent shares purchased in lieu of tax withholding on equity compensation issuances for the quarters ended September 30, June 30 and March 31, 2023, respectively Dividends per common share were $0.3775 for each of the quarters ended September 30, June 30, and March 31, 2023 Dividend per share of Series A Preferred Stock was $52.96 Represents the final settlements of the November 6, 2023 ASR agreements. See Note 9, Changes in Capital Structure for additional information For further discussion of the treasury stock retirements, see Note 9, Changes in Capital Structure Includes $(10) million, $(12) million and $(23) million of equivalent shares purchased in lieu of tax withholding on equity compensation issuances for the quarters ended September 30, June 30 and March 31, 2024, respectively Dividends per common share were $0.4075 for each of the quarters ended September 30, June 30 and March 31, 2024 Dividends per share of Series A Preferred Stock were $51.25 for each of the periods ended September 15 and March 15, 2024 Includes excise tax accrued of $2 million and $1 million for the quarters ended September 30 and June 30, 2024, respectively For further discussion of the Capped Call Options, see Note 9, Changes in Capital Structure

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023		Jun. 30, 2023		Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Shares purchased for tax withholding obligation (in shares)	(10)	(12)	(23)	(3)	[1]	(8)	[1]	(8)	[1]
Dividends per common share (in usd per share)	$ 0.4075	$ 0.4075	$ 0.4075	$ 0.3775		$ 0.3775		$ 0.3775
Dividends per share of Series A Preferred Stock (in usd per share)	$ 51.25		$ 51.25	$ 52.96
Excise tax, accrued	$ 2	$ 1
[1] Includes $(3) million, $(8) million and $(8) million of equivalent shares purchased in lieu of tax withholding on equity compensation issuances for the quarters ended September 30, June 30 and March 31, 2023, respectively

Nature of Business and Basis of

Nature of Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2024
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, sits at the intersection of energy and home services. NRG is a leading energy and home 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 8 million residential consumers in addition to commercial, industrial, and wholesale customers, supported by approximately 13 GW of generation as of September 30, 2024. 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 and (iii) activity related to the Cottonwood facility and other investments; • 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 GAAP 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 2023 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 September 30, 2024, and the results of operations, comprehensive (loss)/income, cash flows and stockholders' equity for the three and nine months ended September 30, 2024 and 2023. The Company identified an error in the previously issued condensed consolidated financial statements for the period ended September 30, 2023 related to the presentation of cash flows associated with certain borrowings and repayments related to certain credit facilities. The statement of cash flows for the period ended September 30, 2023 has been adjusted to present on a gross basis the certain borrowings from credit facilities of $3.0 billion and the related repayments of $3.0 billion. The change had no impact to the total cash used by financing activities for the period ended September 30, 2023. The Company evaluated the materiality of this error both qualitatively and quantitatively and has concluded it is immaterial to the impacted period. 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 of operations, net assets or consolidated cash flows. Presentation Adjustments As of September 30, 2024, the Company is recording the amortization of capitalized contracts costs within depreciation and amortization. This change, along with additional financial statement disclosures, is meant to address investor inquiries by enhancing transparency to easier match expenses with revenues. NRG previously recorded amortization of capitalized contract costs related to fulfillment in cost of operations and amortization of capitalized contract costs related to customer acquisition primarily in selling, general and administrative costs in the consolidated statements of operations. The following table presents adjustments within the condensed consolidated statement of operations for the three and nine months ended September 30, 2023 related to capitalized contract costs: (In millions) As Previously Presented Presentation Adjustments As Adjusted Three months ended September 30, 2023 Cost of operations (excluding depreciation and amortization shown below) $ 6,421 $ (15) $ 6,406 Depreciation and amortization 308 51 359 Selling, general and administrative costs 638 (36) 602 Nine months ended September 30, 2023 Cost of operations (excluding depreciation and amortization shown below) $ 20,161 $ (24) $ 20,137 Depreciation and amortization 813 108 921 Selling, general and administrative costs 1,586 (84) 1,502 The following table presents adjustments within the condensed consolidated statement of cash flows for the nine months ended September 30, 2023 related to capitalized contract costs: (In millions) As Previously Presented Presentation Adjustments As Adjusted Nine months ended September 30, 2023 Cash flows from operating activities: Amortization of capitalized contract costs $ — $ 108 $ 108 Changes in other working capital (985) (108) (1,093)

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies 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 the 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 expected period of benefit periodically and whenever events or circumstances indicate that the expected 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 depreciation and amortization in the condensed 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. Depreciation and Amortization The Company's depreciation and amortization included in the condensed consolidated statement of operations consisted of the following: Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Amortization of capitalized contract costs related to fulfillment $ 34 $ 14 $ 82 $ 20 Amortization of capitalized contract costs related to customer acquisition 57 37 149 88 Amortization of customer relationships and other intangible assets 192 244 610 623 Depreciation of property, plant and equipment 69 64 204 190 Total depreciation and amortization $ 352 $ 359 $ 1,045 $ 921 Credit Losses Retail trade receivables are reported on the consolidated balance sheet net of the allowance for credit losses within accounts receivables, net. Long-term receivables are recorded net of allowance for credit losses in other non-current assets on the consolidated balance sheet. 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 nine months ended September 30, 2024 and 2023: Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Beginning balance $ 127 $ 120 $ 145 $ 133 Acquired balance from Vivint Smart Home — — — 22 Provision for credit losses 95 85 228 165 Write-offs (74) (59) (252) (203) Recoveries collected 9 9 28 30 Other 7 3 15 11 Ending balance $ 164 $ 158 $ 164 $ 158 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) September 30, 2024 December 31, 2023 Property, plant and equipment accumulated depreciation $ 1,470 $ 1,295 Customer relationships and other intangible assets accumulated amortization 3,435 2,994 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) September 30, 2024 December 31, 2023 Cash and cash equivalents $ 1,104 $ 541 Funds deposited by counterparties 12 84 Restricted cash 10 24 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 1,126 $ 649 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. 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 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 nine months ended September 30, 2024: (In millions) Texas East West/Services/Other Vivint Smart Home Total Balance as of December 31, 2023 $ 643 $ 721 $ 221 $ 3,494 $ 5,079 Impairment — — (15) — (15) Sale of Airtron — — (44) — (44) Foreign currency translation adjustments — — (2) — (2) Balance as of September 30, 2024 $ 643 $ 721 $ 160 $ 3,494 $ 5,018 Recent Accounting Developments — Guidance Not Yet Adopted ASU 2023-07 – In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures , or ASU 2023-07. The guidance in ASU 2023-07 enhances reportable segment disclosure requirements by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit and loss, an amount and description of its composition for other segment items and interim disclosures of a reportable segment’s profit or loss and assets. The Company plans to adopt the new guidance for the annual period ending December 31, 2024 and subsequent interim periods thereafter. The guidance will be applied retrospectively for all prior periods presented in the financial statements. ASU 2023-09 – In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) – Improvements to Income Tax Disclosures , or ASU 2023-09. The guidance in ASU 2023-09 enhances income tax disclosures by requiring disclosure of specific categories in the effective tax rate reconciliation and additional information for reconciling items that meet a quantitative threshold. Further the amendments of ASU 2023-09 require certain disclosures on income tax expense and income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The amendments of ASU 2023-09 may be applied on a prospective or retrospective basis. The Company is currently evaluating the impact of adopting ASU 2023-09 on its disclosures. ASU 2024-03 – In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) – Disaggregation of Income Statement Expenses , or ASU 2024-03. The guidance in ASU 2024-03 requires more detailed information about specified categories of expenses included in certain captions presented on the face of the income statement. This ASU is effective for annual periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the impact of adopting ASU 2024-03 on its disclosures.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Performance Obligations As of September 30, 2024, estimated future fixed fee performance obligations are $421 million for the remaining three months of fiscal year 2024, and $1.4 billion, $1.1 billion, $757 million, $459 million and $190 million for the fiscal years 2025, 2026, 2027, 2028 and 2029, 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 nine months ended September 30, 2024 and 2023: Three months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 2,235 $ 616 $ 349 $ 499 $ (4) $ 3,695 Business 996 1,852 411 — — 3,259 Total retail revenue (b) 3,231 2,468 760 499 (4) 6,954 Energy revenue (b) 12 67 52 — (3) 128 Capacity revenue (b) — 40 8 — (1) 47 Mark-to-market for economic hedging activities (c) — 1 6 — 1 8 Contract amortization — (7) (1) — — (8) Other revenue (b) 58 31 8 — (3) 94 Total revenue 3,301 2,600 833 499 (10) 7,223 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 14 13 — — 27 Less: Realized and unrealized ASC 815 revenue 19 33 18 — (1) 69 Total revenue from contracts with customers $ 3,282 $ 2,553 $ 802 $ 499 $ (9) $ 7,127 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 6 $ — $ — $ — $ 6 Energy revenue — 9 12 — (3) 18 Capacity revenue — 17 — — — 17 Other revenue 19 — — — 1 20 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 2,397 $ 544 $ 390 $ 478 $ (1) $ 3,808 Business 1,092 2,089 532 — — 3,713 Total retail revenue (b) 3,489 2,633 922 478 (1) 7,521 Energy revenue (b) 51 152 59 — (1) 261 Capacity revenue (b) — 64 (4) — (1) 59 Mark-to-market for economic hedging activities (c) — (60) (10) — — (70) Contract amortization — (6) 1 — — (5) Other revenue (b) 146 26 10 — (2) 180 Total revenue 3,686 2,809 978 478 (5) 7,946 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 8 10 — — 18 Less: Realized and unrealized ASC 815 revenue 16 58 (7) — — 67 Total revenue from contracts with customers $ 3,670 $ 2,743 $ 975 $ 478 $ (5) $ 7,861 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 14 $ — $ — $ — $ 14 Energy revenue — 77 — — — 77 Capacity revenue — 27 — — — 27 Other revenue 16 — 3 — — 19 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Nine months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 5,361 $ 1,855 $ 1,362 $ 1,434 $ (12) $ 10,000 Business 2,740 6,402 1,385 — — 10,527 Total retail revenue (b) 8,101 8,257 2,747 1,434 (12) 20,527 Energy revenue (b) 35 194 170 — (9) 390 Capacity revenue (b) — 120 16 — (3) 133 Mark-to-market for economic hedging activities (c) — 15 14 — 3 32 Contract amortization — (23) (2) — — (25) Other revenue (b) 161 84 17 — (8) 254 Total revenue 8,297 8,647 2,962 1,434 (29) 21,311 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 36 38 — — 74 Less: Realized and unrealized ASC 815 revenue 29 165 60 — (4) 250 Total revenue from contracts with customers $ 8,268 $ 8,446 $ 2,864 $ 1,434 $ (25) $ 20,987 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 25 $ — $ — $ — $ 25 Energy revenue — 67 50 — (8) 109 Capacity revenue — 58 — — — 58 Other revenue 29 — (4) — 1 26 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Nine months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate/Eliminations Total Retail revenue: Home (b) $ 5,196 $ 1,641 $ 1,421 $ 1,070 $ (1) $ 9,327 Business 2,646 7,366 1,572 — — 11,584 Total retail revenue (c) 7,842 9,007 2,993 1,070 (1) 20,911 Energy revenue (c) 71 254 147 — — 472 Capacity revenue (c) — 154 (3) — (1) 150 Mark-to-market for economic hedging activities (d) — 27 80 — (11) 96 Contract amortization — (24) — — — (24) Other revenue (c) 322 70 27 — (8) 411 Total revenue 8,235 9,488 3,244 1,070 (21) 22,016 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 13 26 — — 39 Less: Realized and unrealized ASC 815 revenue 28 270 97 — (10) 385 Total revenue from contracts with customers $ 8,207 $ 9,205 $ 3,121 $ 1,070 $ (11) $ 21,592 (a) Includes results of operations following the acquisition date of March 10, 2023 (b) Home includes Services (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 $ — $ 57 $ — $ — $ — $ 57 Energy revenue — 137 10 — 1 148 Capacity revenue — 50 — — — 50 Other revenue 28 (1) 7 — — 34 (d) 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 September 30, 2024 and December 31, 2023: (In millions) September 30, 2024 December 31, 2023 Capitalized contract costs ( included in Prepayments and other current assets and Other non-current assets) $ 1,173 $ 706 Accounts receivable, net - Contracts with customers 3,181 3,395 Accounts receivable, net - Accounted for under topics other than ASC 606 74 136 Accounts receivable, net - Affiliate 3 11 Total accounts receivable, net $ 3,258 $ 3,542 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 1,318 $ 1,493 Deferred revenues (a) 1,680 1,634 (a) Deferred revenues from contracts with customers were approximately $1.6 billion as of both September 30, 2024 and December 31, 2023 The revenue recognized from contracts with customers during the three months ended September 30, 2024 and 2023 relating to the deferred revenue balance at the beginning of each period was $290 million and $310 million, respectively, which decreased 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 nine months ended September 30, 2024 and 2023 relating to the deferred revenue balance at the beginning of each period was $511 million and $168 million, respectively, which increased primarily due to the acquisition of Vivint Smart Home.

Acquisitions and Dispositions

Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions Acquisition of Vivint Smart Home On March 10, 2023, 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 brought 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, customer service and technical support and professional monitoring, enabling superior subscriber experiences and a complete end-to-end smart home experience. The acquisition accelerated the realization of NRG's consumer-focused growth strategy and created 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 approximately $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. The acquisition has been recorded as a business combination under ASC 805, with identifiable assets and liabilities acquired recorded at their estimated Acquisition Closing Date fair value. 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 Acquisition costs of $38 million for the nine months ended September 30, 2023 are included in acquisition-related transaction and integration costs in the Company's consolidated statement of operations. For additional information, refer to Note 4, Acquisitions and Dispositions, to the Company's 2023 Form 10-K. Dispositions Sale of Airtron On September 16, 2024, the Company closed on the sale of its 100% ownership in the Airtron business unit. Proceeds of $500 million were reduced by working capital and other adjustments of $16 million, resulting in net proceeds of $484 million. The Company recorded a gain on the sale of $208 million within the West/Services/Other region of operations. Sale of Gregory On October 2, 2023, the Company closed on the sale of its 100% ownership in the Gregory natural gas generating facility in Texas for $102 million. 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 proceeds of $212 million, subject to transaction fees of $3 million and certain indemnifications, resulting in a $199 million gain.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2024
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: September 30, 2024 December 31, 2023 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Convertible Senior Notes $ 232 $ 515 $ 575 $ 739 Other long-term debt, including current portion 10,497 10,412 10,219 9,835 Total long-term debt, including current portion (a) $ 10,729 $ 10,927 $ 10,794 $ 10,574 (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, the Term Loans and Vivint Senior Secured Term Loan (as defined in Note 7, Long-term Debt and Finance Leases ) are based on quoted market prices and are classified as Level 2 within the fair value hierarchy. Recurring Fair Value Measurements Debt securities, 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: September 30, 2024 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 26 $ — $ 26 $ — Derivative assets: Interest rate contracts 2 — 2 — Foreign exchange contracts 5 — 5 — Commodity contracts 4,196 626 3,384 186 Equity securities measured using net asset value practical expedient (classified within other non-current assets) 6 Total assets $ 4,235 $ 626 $ 3,417 $ 186 Derivative liabilities: Interest rate contracts $ 30 $ — $ 30 $ — Foreign exchange contracts 2 — 2 — Commodity contracts 3,588 654 2,722 212 Consumer Financing Program 200 — — 200 Total liabilities $ 3,820 $ 654 $ 2,754 $ 412 December 31, 2023 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 21 $ — $ 21 $ — Derivative assets: Interest rate contracts 12 — 12 — Foreign exchange contracts 5 — 5 — Commodity contracts 6,138 1,334 4,470 334 Equity securities measured using net asset value practical expedient (classified within other non-current assets) 6 Total assets $ 6,182 $ 1,334 $ 4,508 $ 334 Derivative liabilities: Interest rate contracts $ 8 $ — $ 8 $ — Foreign exchange contracts 9 — 9 — Commodity contracts 5,356 1,413 3,728 215 Consumer Financing Program 134 — — 134 Total liabilities $ 5,507 $ 1,413 $ 3,745 $ 349 The following table reconciles, for the three and nine months ended September 30, 2024 and 2023, 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 September 30, 2024 Three months ended September 30, 2023 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Beginning balance $ 121 $ 905 $ 119 $ 505 Total (losses)/gains realized/unrealized included in earnings (83) 5 (120) (172) Purchases (38) (115) (7) 25 Transfers into Level 3 (b) (19) (374) (2) 64 Transfers out of Level 3 (b) (7) — (16) (1) Ending balance $ (26) $ 421 $ (26) $ 421 (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 $ (41) $ 75 $ (70) $ (56) (a) Consists of derivative assets and liabilities, net, excluding derivatives liabilities from the Consumer Financing Program, which are presented in a separate table below (b) Transfers into/out of Level 3 within the fair value hierarchy are related to the availability of consensus pricing and external broker quotes and are valued as of the end of the reporting period. All transfers in/out of Level 3 are from/to 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 nine months ended September 30, 2024 and 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 September 30, 2024 Three months ended September 30, 2023 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Beginning balance $ (151) $ (115) $ (134) $ — Contractual obligations added from the acquisition of Vivint Smart Home — — — (112) New contractual obligations (63) (33) (121) (55) Settlements 21 21 64 43 Total losses included in earnings (7) (1) (9) (4) Ending balance $ (200) $ (128) $ (200) $ (128) Gains and losses that are related to the Consumer Financing Program derivative are recorded in other income, net. Derivative Fair Value Measurements The Company's contracts consist of non-exchange traded contracts valued using prices provided by external sources and exchange-traded contracts with readily available quoted market prices. Beginning in the fourth quarter of 2023 and as of September 30, 2024, the fair value of non-exchange traded contracts were primarily based on consensus pricing provided by independent pricing services. The pricing data was compiled from market makers with longer dated tenors as compared to broker quotes, enhancing reliability and increasing transparency. Prior to the fourth quarter of 2023, the Company valued derivatives based on price quotes from brokers in active markets who regularly facilitate those transactions. 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 September 30, 2024, contracts valued with prices provided by models and other valuation techniques made up 4% of derivative assets and 11% of derivative liabilities. NRG's significant positions classified as Level 3 include physical and financial natural gas, power, capacity contracts and RECs executed in illiquid markets, FTRs and the Consumer Financing Program. 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. Forward capacity prices are based on market information, forecasted future electricity demand and supply, past auctions and internally developed pricing models. REC prices are based on market information and internally developed pricing models. 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 credit loss rates. The following tables quantify the significant, unobservable inputs used in developing the fair value of the Company's Level 3 positions as of September 30, 2024 and December 31, 2023: September 30, 2024 Fair Value Input/Range (In millions, except as noted) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 38 $ 27 Discounted Cash Flow Forward Market Price ($ per MMBtu) $ 1 $ 13 $ 4 Power Contracts 75 138 Discounted Cash Flow Forward Market Price ($ per MWh) 0 131 41 Capacity Contracts 27 12 Discounted Cash Flow Forward Market Price ($ per MW/Day) 20 649 207 RECs 31 9 Discounted Cash Flow Forward Market Price ($ per Certificate) 2 245 16 FTRs 15 26 Discounted Cash Flow Auction Prices ($ per MWh) (38) 8,434 0 Consumer Financing Program — 200 Discounted Cash Flow Collateral Default Rates 0.25 % 100.00 % 10.90 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.86 % Discounted Cash Flow Credit Loss Rates 4.70 % 60.00 % 13.88 % $ 186 $ 412 December 31, 2023 Fair Value Input/Range (In millions, except as noted) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 39 $ 65 Discounted Cash Flow Forward Market Price ($ per MMBtu) $ 1 $ 15 $ 3 Power Contracts 197 66 Discounted Cash Flow Forward Market Price ($ per MWh) 1 210 47 Capacity Contracts 21 33 Discounted Cash Flow Forward Market Price ($ per MW/Day) 49 658 285 RECs 58 14 Discounted Cash Flow Forward Market Price ($ per Certificate) 2 320 15 FTRs 19 37 Discounted Cash Flow Auction Prices ($ per MWh) (58) 252 0 Consumer Financing Program — 134 Discounted Cash Flow Collateral Default Rates 0.43 % 93.30 % 8.12 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.95 % Discounted Cash Flow Credit Loss Rates 6.00 % 60.00 % 12.57 % $ 334 $ 349 The following table provides sensitivity of fair value measurements to increases/(decreases) in significant, unobservable inputs as of September 30, 2024 and December 31, 2023: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Natural Gas/Power/Capacity/RECs Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Natural Gas/Power/Capacity/RECs 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) Credit Loss 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 September 30, 2024, the credit reserve resulted in a $2 million decrease primarily within cost of operations. As of December 31, 2023, the credit reserve resulted in a $18 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 2023 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 2023 Form 10-K. As of September 30, 2024, counterparty credit exposure, excluding credit exposure from RTOs, ISOs, registered commodity exchanges and certain long-term agreements, was $1.3 billion and NRG held collateral (cash and letters of credit) against those positions of $128 million, resulting in a net exposure of $1.2 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 30% of the Company's exposure before collateral is expected to roll off by the end of 2025. 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 75 % Financial institutions 25 Total as of September 30, 2024 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 59 % Non-investment grade/Non-Rated 41 Total as of September 30, 2024 100 % (a) Counterparty credit exposure excludes 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 no exposure to wholesale counterparties in excess of 10% of total net exposure as of September 30, 2024. 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 solar under 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 September 30, 2024, aggregate credit risk exposure managed by NRG to these counterparties was approximately $890 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 by using established credit policies, which include monitoring of the portfolio and the use of credit mitigation measures such as deposits or prepayment arrangements. As of September 30, 2024, 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 their bills in a timely manner or at all, which could increase customer delinquencies and may lead to an increase in credit losses.

Accounting for Derivative Instr

Accounting for Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2024
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 September 30, 2024, NRG had energy-related derivative instruments extending through 2036. The Company marks these derivatives to market through the consolidated statement of operations. NRG has executed energy-related contracts extending through 2037 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. To manage the Company's interest rate risk, NRG enters into interest rate swap agreements. In the first quarter of 2024, the Company entered into interest rate swaps with a total nominal value of $700 million extending through 2029 to hedge the floating rate of the Term Loans. Additionally, as of September 30, 2024, the Company had $1.0 billion of interest rate swaps extending through 2027 to hedge the floating rate of the Vivint Term Loans (as defined in Note 7, Long-term Debt and Finance Leases ). In November 2024, in connection with the repayment of the Vivint Term Loans and the increase of the Term Loans, the Company decreased its interest rate swap notional value from $1.7 billion to $700 million. Foreign Exchange Contracts NRG is exposed to changes in foreign currency primarily associated with the purchase of U.S. dollar denominated natural gas for its Canadian business. To manage the Company's foreign exchange risk, NRG entered into foreign exchange contracts. As of September 30, 2024, NRG had foreign exchange contracts extending through 2028. The Company marks these derivatives to market through the consolidated 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 credit loss rates. 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 Providers 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 September 30, 2024 and December 31, 2023. 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 September 30, 2024 December 31, 2023 Emissions Short Ton 1 — RECs Certificates 12 12 Coal Short Ton 11 9 Natural Gas MMBtu 759 838 Oil Barrels 1 — Power MWh 206 201 Interest Dollars 1,700 1,000 Foreign Exchange Dollars 433 548 Consumer Financing Program Dollars 1,275 1,116 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) September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Interest rate contracts - current $ 2 $ 12 $ 1 $ — Interest rate contracts - long-term — — 29 8 Foreign exchange contracts - current 4 3 1 4 Foreign exchange contracts - long-term 1 2 1 5 Commodity contracts - current 2,450 3,847 2,234 3,922 Commodity contracts - long-term 1,746 2,291 1,354 1,434 Consumer Financing Program - short-term — — 115 93 Consumer Financing Program - long-term — — 85 41 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 4,203 $ 6,155 $ 3,820 $ 5,507 The Company has elected to present derivative assets and liabilities on the consolidated 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 consolidated 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 September 30, 2024 Interest rate contracts: Derivative assets $ 2 $ (2) $ — $ — Derivative liabilities (30) 2 — (28) Total interest rate contracts $ (28) $ — $ — $ (28) Foreign exchange contracts: Derivative assets $ 5 $ (1) $ — $ 4 Derivative liabilities (2) 1 — (1) Total foreign exchange contracts $ 3 $ — $ — $ 3 Commodity contracts: Derivative assets $ 4,196 $ (3,224) $ (6) $ 966 Derivative liabilities (3,588) 3,224 166 (198) Total commodity contracts $ 608 $ — $ 160 $ 768 Consumer Financing Program: Derivative liabilities $ (200) $ — $ — $ (200) Total derivative instruments $ 383 $ — $ 160 $ 543 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, 2023 Interest rate contracts: Derivative assets $ 12 $ (8) $ — $ 4 Derivative liabilities (8) 8 — — Total interest rate contracts $ 4 $ — $ — $ 4 Foreign exchange contracts: Derivative assets $ 5 $ (5) $ — $ — Derivative liabilities (9) 5 — (4) Total foreign exchange contracts $ (4) $ — $ — $ (4) Commodity contracts: Derivative assets $ 6,138 $ (4,926) $ (74) $ 1,138 Derivative liabilities (5,356) 4,926 145 (285) Total commodity contracts $ 782 $ — $ 71 $ 853 Consumer Financing Program: Derivative liabilities $ (134) $ — $ — $ (134) Total derivative instruments $ 648 $ — $ 71 $ 719 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 consolidated 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 September 30, Nine months ended September 30, Unrealized mark-to-market results 2024 2023 2024 2023 Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges $ (414) $ (522) $ 39 $ (1,519) Reversal of acquired (gain)/loss positions related to economic hedges (8) (6) (3) 4 Net unrealized (losses)/gains on open positions related to economic hedges (1,208) 475 (319) (418) Total unrealized mark-to-market (losses) for economic hedging activities (1,630) (53) (283) (1,933) Reversal of previously recognized unrealized (gains)/losses on settled positions related to trading activity (1) — (1) 11 Net unrealized (losses)/gains on open positions related to trading activity (4) (1) 1 13 Total unrealized mark-to-market (losses)/gains for trading activity (5) (1) — 24 Total unrealized (losses) - commodities and foreign exchange $ (1,635) $ (54) $ (283) $ (1,909) Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Total impact to statement of operations - interest rate contracts $ (49) $ 8 $ (31) $ 32 Unrealized gains/(losses) included in revenues - commodities $ 3 $ (71) $ 32 $ 120 Unrealized (losses)/gains included in cost of operations - commodities (1,633) 8 (321) (2,024) Unrealized (losses)/gains included in cost of operations - foreign exchange (5) 9 6 (5) Total impact to statement of operations - commodities and foreign exchange $ (1,635) $ (54) $ (283) $ (1,909) Total impact to statement of operations - Consumer Financing Program $ (7) $ (1) $ (9) $ (4) The reversals of acquired loss positions were valued based upon the forward prices on the acquisition date. The roll-off amounts were offset by realized gains or losses at the settled prices and are reflected in revenue or cost of operations during the same period. For the nine months ended September 30, 2024, the $319 million unrealized loss from open economic hedge positions was primarily the result of a decrease in the value of forward positions as a result of decreases in power prices. For the nine months ended September 30, 2023, the $418 million unrealized loss from open economic hedge positions was primarily the result of a decrease in the value of forward positions as a result of decreases in natural gas and power prices in the East and West. 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 September 30, 2024 was $444 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 $31 million as of September 30, 2024. In the event of a downgrade in the Company's credit rating and if called for by the counterparty, $27 million of additional collateral would be required for all contracts with credit rating contingent features as of September 30, 2024. See Note 5, Fair Value of Financial Instruments , for discussion regarding concentration of credit risk.

Long-term Debt and Finance Leas

Long-term Debt and Finance Leases	9 Months Ended
	Sep. 30, 2024
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) September 30, 2024 December 31, 2023 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 480 480 3.875 Convertible Senior Notes, due 2048 (a) 232 575 2.750 Senior Secured First Lien Notes, due 2024 — 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 740 740 7.000 Term Loan, due 2031 871 — SOFR + 2.000 Tax-exempt bonds 466 466 1.250 - 4.750 Subtotal recourse debt 8,148 8,220 Non-recourse debt: Vivint Senior Notes, due 2029 800 800 5.750 Vivint Senior Secured Notes, due 2027 600 600 6.750 Vivint Senior Secured Term Loan, due 2028 1,310 1,320 SOFR + 2.750 Subtotal all Vivint non-recourse debt 2,710 2,720 Subtotal long-term debt (including current maturities) 10,858 10,940 Finance leases 11 19 various Subtotal long-term debt and finance leases (including current maturities) 10,869 10,959 Less current maturities (258) (620) Less debt issuance costs (60) (60) Discounts (129) (146) Total long-term debt and finance leases $ 10,422 $ 10,133 (a) As of the ex-dividend date of November 1, 2024, the Convertible Senior Notes were convertible at a price of $40.94, which is equivalent to a conversion rate of approximately 24.4241 shares of common stock per $1,000 principal amount Recourse Debt Issuance of 2029 Senior Notes, 2033 Senior Notes and 2034 Senior Notes On October 30, 2024, the Company issued $1.9 billion in aggregate principal amount of senior unsecured notes, consisting of (i) $925 million aggregate principal amount of 6.000% senior unsecured notes due 2033 (the “2033 Notes”) and (ii) $950 million aggregate principal amount of 6.250% senior notes due 2034 (the “2034 Notes” and, together with the 2033 Notes, the “Notes”). In addition, on October 30, 2024, the Company issued $798 million aggregate principal amount of 5.750% senior unsecured notes due 2029 (the “New NRG 5.750% Senior Notes due 2029”) in connection with the Company’s previously announced offer to exchange. The Notes and the New NRG 5.750% Senior Notes due 2029 are senior unsecured obligations of the Company and are guaranteed by certain of its subsidiaries that guarantee indebtedness under the Senior Credit Facility. Interest on the New NRG 5.750% Senior Notes due 2029 is paid semi-annually beginning on January 15, 2025 until the maturity date of July 15, 2029. Interest on the 2033 Notes is paid semi-annually beginning on February 1, 2025 until the maturity date of February 1, 2033. Interest on the 2034 Notes is paid semi-annually beginning on May 1, 2025 until the maturity date of November 1, 2034. On October 30, 2024, the Company used the net proceeds from the offering of the Notes, together with the net proceeds of its new incremental term loan B in an aggregate principal amount of $450 million, and cash on hand, to pay the cash tender price for any and all of APX Group, Inc.’s 6.750% Senior Secured Notes due 2027 and to repay the APX Group, Inc.'s secured term loans in an outstanding aggregate principal amount of approximately $1.3 billion under its senior secured credit agreement. In addition, on October 31, 2024, the Company used the net proceeds from the offering of the Notes to redeem all of its outstanding 6.625% Senior Notes due 2027, of which $375 million aggregate principal amount was outstanding. Any remaining net proceeds from the offering will be used to pay the transaction fees, expenses and premiums, to refinance outstanding debt and for general corporate purposes. Senior Credit Facility Term Loan B Incurrence On April 16, 2024, the Company, as borrower, and certain of its subsidiaries, as guarantors, entered into the Eighth Amendment to the Second Amended and Restated Credit Agreement (the “Eighth Amendment”) with, among others, Citicorp North America, Inc., as administrative agent (the “Agent”) and as collateral agent, and certain financial institutions, as lenders, which amended the Company’s Second Amended and Restated Credit Agreement, dated as of June 30, 2016 (as amended, restated, supplemented and/or otherwise modified from time to time, the “Credit Agreement”), in order to (i) establish a new term loan B facility with borrowings of $875 million in aggregate principal amount (the “Existing Term Loan B Facility” and the loans thereunder, the “Term Loans”) and (ii) make certain other modifications to the Credit Agreement as set forth therein. The proceeds from the Term Loans were used to repay a portion of the Company’s Convertible Senior Notes, all of the Company’s 3.750% senior secured first lien notes due 2024 and for general corporate purposes. At the Company’s election, the Term Loans bear interest at a rate per annum equal to either (1) a fluctuating rate equal to the highest of (A) the rate published by the Federal Reserve Bank of New York in effect on such day, plus 0.50%, (B) the rate of interest per annum publicly announced from time to time by The Wall Street Journal as the “Prime Rate” in the United States, and (C) a rate of one-month Term SOFR (as defined in the Credit Agreement) (after giving effect to any floor applicable to Term SOFR) plus 1.00%, in each case, plus a margin of 1.00% or (2) Term SOFR (as defined in the Credit Agreement) (which shall not be less than 0.00%) for a one-, three- or six-month interest period (or such other period as agreed to by the Agent and the lenders, as selected by the Company), plus a margin of 2.00%. On October 30, 2024, the Company, as borrower, and certain subsidiaries of the Company, as guarantors, entered into the Eleventh Amendment to the Second Amended and Restated Credit Agreement (the “Eleventh Amendment”) with, among others, the Agent and certain financial institutions, as lenders, which amended the Credit Agreement in order to include a new incremental term loan B in an aggregate principal amount of $450 million (the “Incremental Term Loan B Facility” and the loans thereunder, the “Incremental Term Loans”) which Incremental Term Loan B Facility is fungible for U.S. federal tax purposes with the Existing Term Loan B Facility. The proceeds from the Incremental Term Loans, together with the proceeds of the Notes, were used to repay all loans and other amounts outstanding under APX’s senior secured credit agreement and to fund the working capital needs and other general corporate purposes of the Company and its subsidiaries. The terms of the Incremental Term Loan B Facility (including pricing) are identical to those applicable to, and the Incremental Term Loans constitute the same class of term loans as, the Company’s Existing Term Loan B Facility. At the Company’s election, the Incremental Term Loans bear interest at a rate per annum equal to either (1) a fluctuating rate equal to the highest of (A) the rate published by the Federal Reserve Bank of New York in effect on such day, plus 0.50%, (B) the rate of interest per annum publicly announced from time to time by The Wall Street Journal as the “Prime Rate” in the United States, and (C) a rate of one-month Term SOFR (as defined in the Credit Agreement), plus 1.00%, in each case, plus a margin of 1.00%, or (2) Term SOFR (as defined in the Credit Agreement) (which will not be less than 0.00%) for a one-, three- or six-month interest period (or such other period as agreed to by the Agent and the lenders, as selected by the Company), plus a margin of 2.00%. The Existing Term Loan B Facility and the Incremental Term Loan B Facility are guaranteed by each of the Company’s subsidiaries that guarantee the Company’s Revolving Credit Facility and are secured on a first lien basis by substantially all of the Company’s and such subsidiaries’ assets, in each case, subject to certain customary exceptions and limitations set forth in the Credit Agreement. The Existing Term Loan B Facility and Incremental Term Loan B Facility have a final maturity date of April 16, 2031 and amortize at a rate of 1% per annum in equal quarterly installments (subject to any adjustments to such amortization payments to ensure that such Incremental Term Loan B Facility is fungible for U.S. federal tax purposes with the Company’s Existing Term Loan B Facility). If an event of default occurs under the Existing Term Loan B Facility or the Incremental Term Loan B Facility, the entire principal amount outstanding thereunder, together with all accrued unpaid interest and other amounts owing in respect thereof, may be declared immediately due and payable, subject, in certain instances, to the expiration of applicable cure periods. The Term Loan Facility and the Incremental Term Loan B Facility also provide for customary asset sale mandatory prepayments, reporting covenants and negative covenants governing dividends, investments, indebtedness, and other matters that are customary for similar term loan B facilities. Revolving Credit Facility On April 22, 2024, the Company, as borrower, and certain of its subsidiaries, as guarantors, entered into the Ninth Amendment to the Second Amended and Restated Credit Agreement (the “Ninth Amendment”) to extend the maturity date of a portion of the revolving commitments thereunder to February 14, 2028. On October 30, 2024, the Company, as borrower, and certain subsidiaries of the Company, as guarantors, entered into the Tenth Amendment to the Second Amended and Restated Credit Agreement (the "Tenth Amendment") with, among others, Citicorp North America, Inc., as administrative agent and as collateral agent (the “Agent”), and certain financial institutions, as lenders, which amended the Company’s Second Amended and Restated Credit Agreement, dated as of June 30, 2016 (the “Credit Agreement”), in order to (i) extend the maturity date of its revolving credit facility to October 30, 2029 and (ii) make certain other amendments to the Credit Agreement. 2048 Convertible Senior Notes As of October 1, 2024, the Company's Convertible Senior Notes are convertible during the quarterly period ending December 31, 2024 due to the satisfaction of the Common Stock Sale Price Condition (as defined below). As of September 30, 2024, the Convertible Senior Notes are convertible into cash or a combination of cash and the Company’s common stock at a price of $41.11 per common share, which is the equivalent to a conversion rate of approximately 24.3220 shares of common stock per $1,000 principal amount of Convertible Senior Notes. The settlement method is at the Company's election. The net carrying amounts of the Convertible Senior Notes as of September 30, 2024 and December 31, 2023 were $231 million and $572 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, including, among others, during any calendar quarter (and only during such calendar quarter) if the last reported sales price per share of the Company's common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter (the "Common Stock Sale Price Condition"). 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. All conversions with a conversion date that occurs within the specific periods above will be settled after such period pursuant to the terms of the Convertible Senior Notes indenture. The following table details the interest expense recorded in connection with the Convertible Senior Notes: Three months ended September 30, Nine months ended September 30, (In millions, except percentages) 2024 2023 2024 2023 Contractual interest expense $ 1 $ 4 $ 7 $ 12 Amortization of deferred finance costs — — 1 1 Total $ 1 $ 4 $ 8 $ 13 Effective Interest Rate 0.76 % 0.76 % 2.31 % 2.28 % Repurchases During the nine months ended September 30, 2024, the Company completed repurchases of a portion of the Convertible Senior Notes using cash on hand and a portion of the proceeds from the Term Loans, as detailed in the table below. For the nine months ended September 30, 2024, a $260 million loss on debt extinguishment was recorded. (In millions, except percentages) Settlement Period Principal Repurchased Cash Paid (a) Average Repurchase Percentage March 2024 $ 92 $ 151 162.356% April 2024 251 452 179.454% Total Repurchases $ 343 $ 603 (a) Includes accrued interest of $1 million and $2 million for the March and April repurchases, respectively Capped Call Options During the second quarter of 2024, the Company entered into privately negotiated capped call transactions with certain counterparties (the "Capped Calls") to effectively lock in a conversion premium of $257 million on the remaining $232 million of the Convertible Senior Notes. The option price of $257 million was incurred when the Company entered into the Capped Calls, which will be payable upon the earlier of settlement and expiration of the applicable Capped Calls. For further discussion see Note 9, Changes in Capital Structure . Receivables Securitization Facilities On June 21, 2024, 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 20, 2025, (ii) increase the aggregate commitments from $1.4 billion to $2.3 billion (adjusted seasonally) and (iii) add a new originator. As of September 30, 2024, there were no outstanding borrowings and there were $1.5 billion in letters of credit issued. Also on June 21, 2024, Direct Energy Services, LLC (in its capacity as additional originator, the “Additional Originator”) entered into a Joinder Agreement (the “Joinder Agreement”) to join as Additional Originator to the Receivables Sale Agreement, dated as of September 22, 2020, among Direct Energy, LP, Direct Energy Business, LLC, Green Mountain Energy Company, NRG Business Marketing, LLC, Reliant Energy Northeast LLC, Reliant Energy Retail Services, LLC, Stream SPE, Ltd., US Retailers LLC and XOOM Energy Texas, LLC, as originators, NRG Retail, as the servicer, and NRG Receivables (the “Receivables Sale Agreement”). Pursuant to the Joinder Agreement, the Additional Originator agrees to be bound by the terms of the Receivables Sale Agreement, will sell to NRG Receivables substantially all of its receivables for the sale of electricity, natural gas and/or related services and certain related rights (collectively, the “Receivables”) and in connection therewith have transferred to NRG Receivables the deposit accounts into which the proceeds of such Receivables are paid. Concurrently with the amendments to the Receivables Facility, the Company and the originators thereunder terminated the existing uncommitted Repurchase Facility. 3.750% Senior Secured First Lien Note due 2024 Repayment On June 17, 2024, the Company repaid $600 million in aggregate principal amount of its 3.750% Senior Secured First Lien Notes due 2024. 6.625% Senior Notes due 2027 Repayment On October 31, 2024, the Company used the net proceeds from the offering of the Notes to redeem all of its outstanding 6.625% Senior Notes due 2027, of which $375 million aggregate principal amount was outstanding. Non-recourse Debt Vivint Secured Notes Tender Offer On October 30, 2024, in connection with APX Group, Inc.'s previously announced offer to purchase for cash (the "Tender Offer") any and all of APX Group, Inc.'s outstanding 6.750% senior secured notes due 2027 (the “Vivint 6.750% Senior Secured Notes due 2027”), APX Group, Inc. purchased $589 million of the Vivint 6.750% Senior Secured Notes due 2027 that had been validly tendered. On October 30, 2024, APX Group, Inc. notified the trustee for the Vivint 6.750% Senior Secured Notes due 2027 of its election to redeem the $11 million of the Vivint 6.750% Senior Secured Notes due 2027 that remained outstanding following the Tender Offer on November 8, 2024. The redemption price for such remaining Vivint 6.750% Senior Secured Notes due 2027 was equal to the total consideration paid in connection with the Tender Offer. Vivint Unsecured Notes Exchange Offer In connection with the Company’s previously announced offer to exchange (the "Exchange Offer") a ny and all outstanding 5.750% Senior Notes due 2029 (the “Vivint 5.750% Senior Notes due 2029”) issued by APX Group, Inc. for the New NRG 5.750% Senior Notes due 2029 and cash, NRG accepted tenders with respect to $798 million aggregate principal amount of the Vivint 5.750% Senior Notes due 2029 that were tendered on or prior to the early tender date. On October 30, 2024, the Company issued the New NRG 5.750% Senior Notes due 2029 in an aggregate principal amount of $798 million. The New NRG 5.750% Senior Notes due 2029 are senior unsecured obligations of NRG and are guaranteed by certain of its subsidiaries that guarantee indebtedness under the Senior Credit Facility. Vivint Term Loan Repricing On April 10, 2024, the Company’s wholly-owned indirect subsidiary, Vivint, entered into Amendment No. 2 (the "Second Amendment") to the Second Amended and Restated Credit Agreement dated as of June 9, 2021 (the “Vivint Credit Agreement”) with, among others, Bank of America, N.A. as administrative agent (the “Vivint Agent”), and certain financial institutions, as lenders, which amended the Vivint Credit Agreement in order to (i) reprice its term loan B facility (the term loans thereunder, the “Vivint Term Loans”) and (ii) make certain other modifications to the Vivint Credit Agreement as set forth therein. At Vivint’s election, the Vivint Term Loans bear interest at a rate per annum equal to either (1) a fluctuating rate equal to the highest of (A) the rate published by the Federal Reserve Bank of New York in effect on such day, plus 0.50%, (B) the rate of interest per annum publicly announced from time to time by The Wall Street Journal as the “Prime Rate” in the United States, and (C) a rate of one-month Term SOFR (as defined in the Vivint Credit Agreement), (after giving effect to any floor applicable to Term SOFR) plus 1.00%, in each case, plus a margin of 1.75%, or (2) Term SOFR (as defined in the Vivint Credit Agreement) (which Term SOFR shall not be less than 0.50%) for a one-, three- or six-month interest period (or such other period as agreed to by the Vivint Agent and the lenders, as selected by Vivint), plus a margin of 2.75%. On October 30, 2024, the Company repaid in full the outstanding Vivint Term Loans and terminated the revolving credit facility under the Vivint Credit Agreement.

Investments Accounted for Using

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs	9 Months Ended
	Sep. 30, 2024
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. 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 2023 Form 10-K. The summarized financial information for the Company's consolidated VIE consisted of the following: (In millions) September 30, 2024 December 31, 2023 Accounts receivable and Other current assets $ 2,457 $ 1,541 Current liabilities 154 153 Net assets $ 2,303 $ 1,388

Changes in Capital Structure

Changes in Capital Structure	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Changes in Capital Structure	Changes in Capital Structure As of September 30, 2024 and December 31, 2023, 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, 2023 650,000 267,330,470 (59,199,520) 208,130,950 Shares issued under LTIPs — 1,836,827 — 1,836,827 Shares issued under ESPP — — 145,562 145,562 Shares repurchased — — (5,181,424) (5,181,424) Partial settlement of Capped Call Options — — (2,588) (2,588) Retirement of treasury stock — (5,111,012) 5,111,012 — Balance as of September 30, 2024 650,000 264,056,285 (59,126,958) 204,929,327 Shares issued under LTIPs — 64,861 — 64,861 Shares issued under ESPP — — 96,508 96,508 Shares repurchased — — (2,524,323) (2,524,323) Retirement of treasury stock — (2,064,950) 2,064,950 — Balance as of October 31, 2024 650,000 262,056,196 (59,489,823) 202,566,373 Common Stock Share Repurchases The Company's long-term capital allocation policy is to target allocating approximately 80% of cash available for allocation, after debt reduction, to be returned to shareholders. In June 2023, NRG announced an increase to its existing share repurchase authorization to $2.7 billion, to be executed through 2025. In October 2024, the Board of Directors authorized an additional $1.0 billion for share repurchases as part of the existing share repurchase authorization. As of October 31, 2024, $2.0 billion is remaining under the $3.7 billion authorization. The following table summarizes the share repurchases made under the $3.7 billion authorization through October 31, 2024: Total number of shares purchased Average price paid per share Amounts paid for shares purchased (in millions) 2023 Repurchases: Open market repurchases 5,054,798 $ 39.56 $ 200 Repurchases made under the accelerated share repurchase agreements 17,676,142 (b) 950 Total Share Repurchases during 2023 22,730,940 1,150 (a) 2024 Repurchases: Repurchases made under the accelerated share repurchase agreements 1,163,230 (b) — Open market repurchases (c) 4,018,194 $ 79.26 319 Total Share Repurchases during the nine months ended September 30, 2024 5,181,424 $ 319 (d) Open market repurchases October 1, 2024 through October 31, 2024 2,524,323 $ 89.23 225 Total Share Repurchases under the $3.7 billion authorization 30,436,687 $ 55.65 $ 1,694 (a) Excludes $10 million accrued for excise tax owed as of December 31, 2023 (b) Under the November 6, 2023 ASR, the Company received a total of 18,839,372 shares for an average price per share of $50.43, excluding the impact of the excise tax incurred. See discussion below for further information of the ASR agreements (c) Includes $3 million accrued as of September 30, 2024 (d) Excludes $3 million accrued for estimated excise tax owed as of September 30, 2024 On November 6, 2023, the Company executed Accelerated Share Repurchase agreements to repurchase a total of $950 million of NRG's outstanding common stock based on volume-weighted average prices. The Company received 17,676,142 shares in the fourth quarter of 2023, which were recorded in treasury stock at fair value based on the closing prices of $833 million, with the remaining $117 million recorded in additional paid-in-capital, representing the value of the forward contracts to purchase additional shares. During the first quarter of 2024, the Company received an additional 1,163,230 shares pursuant to the ASR agreements. Upon receipt of the final shares, the Company transferred the $117 million from additional paid-in-capital to treasury stock. 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. NRG Common Stock Dividends During the first quarter of 2024, NRG increased the annual dividend to $1.63 from $1.51 per share. A quarterly dividend of $0.4075 per share was paid on the Company's common stock during the three months ended September 30, 2024. On October 11, 2024, NRG declared a quarterly dividend on the Company's common stock of $0.4075 per share, payable on November 15, 2024 to stockholders of record as of November 1, 2024. Beginning in the first quarter of 2025, NRG will increase the annual dividend by 8% to $1.76 per share. The Company expects to target an annual dividend growth rate of 7%-9% per share in subsequent years. The Company's common stock dividends are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations. Retirement of Treasury Stock During the nine months ended September 30, 2024, the Company retired shares of treasury stock as detailed below. These retired shares are now included in NRG's pool of authorized but unissued shares. The Company's accounting policy upon the formal retirement of treasury stock is to deduct its par value from common stock and to reflect any excess of cost over par value as a deduction from additional paid-in-capital. Total number of treasury shares retired Average price per share Carrying value of treasury shares retired (in millions) Shares retired during the first quarter of 2024 1,163,230 $ 32.67 $ 38 Shares retired during the second quarter of 2024 1,114,400 33.84 38 Shares retired during the third quarter of 2024 2,833,382 35.40 100 Total shares retired during the nine months ended September 30, 2024 5,111,012 $ 176 Capped Call Options During the second quarter of 2024, the Company entered into privately negotiated capped call transactions with certain counterparties (the "Capped Calls"). The Capped Calls each have a strike price of $41.11 per share, subject to certain adjustments, which correspond to the conversion price of the Convertible Senior Notes as of September 30, 2024. The Capped Calls have a cap price of $249.00 per share, subject to certain adjustments, and effectively lock in a conversion premium of $257 million on the remaining $232 million balance of the Convertible Senior Notes. The options will expire on June 1, 2025 if not exercised. The Capped Calls are separate transactions and not part of the terms of the Convertible Senior Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity. The option price of $257 million incurred in connection with the Capped Calls, of which $253 million was recorded as a reduction to additional paid-in capital and a $4 million loss was recorded to other income, net to account for the change in the value of the Capped Calls during the calculation period which began on May 31, 2024 and concluded on June 28, 2024. The option price will be payable upon the earlier of settlement and expiration of the applicable Capped Calls. Preferred Stock Series A Preferred Stock Dividends During the quarters ended March 31, 2024 and September 30, 2024, the Company declared and paid semi-annual 10.25% dividends of $51.25 per share on its outstanding Series A Preferred Stock, each totaling $33 million.

(Loss)_Income Per Share

(Loss)/Income Per Share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
(Loss)/Income Per Share	(Loss)/Income Per Share Basic (loss)/income per common share is computed by dividing net (loss)/income 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 (loss)/income per share is computed in a manner consistent with that of basic (loss)/income per share while giving effect to all potentially dilutive common shares that were outstanding during the period when there is net income. The performance stock units and non-vested restricted stock units are not considered outstanding for purposes of computing basic (loss)/income 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 a combination of cash and the 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. NRG's basic and diluted (loss)/income per share is shown in the following table: Three months ended September 30, Nine months ended September 30, (In millions, except per share data) 2024 2023 2024 2023 Basic (loss)/income per share: Net (loss)/income $ (767) $ 343 $ 482 $ (684) Less: Cumulative dividends attributable to Series A Preferred Stock 17 17 51 38 Net (loss)/income available for common stockholders $ (784) $ 326 $ 431 $ (722) Weighted average number of common shares outstanding - basic 207 230 207 230 (Loss)/income per weighted average common share — basic $ (3.79) $ 1.42 $ 2.08 $ (3.14) Diluted (loss)/income per share: Net (loss)/income $ (767) $ 343 $ 482 $ (684) Less: Cumulative dividends attributable to Series A Preferred Stock 17 17 51 38 Net (loss)/income available for common stockholders $ (784) $ 326 $ 431 $ (722) Weighted average number of common shares outstanding - basic 207 230 207 230 Incremental shares attributable to the issuance of equity compensation (treasury stock method) — 2 3 — Incremental shares attributable to the potential share settlements of the Convertible Senior Notes (if converted method) — — 3 — Weighted average number of common shares outstanding - dilutive 207 232 213 230 (Loss)/income per weighted average common share — diluted $ (3.79) $ 1.41 $ 2.02 $ (3.14) 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 (loss)/income per share: Three months ended September 30, Nine months ended September 30, (In millions of shares) 2024 2023 2024 2023 Equity compensation plans 5 — — 6 Potential share settlement of the Convertible Senior Notes 3 — — —

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2024
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. Vivint Smart Home operations 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 (loss)/income. 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 2023 Form 10-K. Three months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 3,301 $ 2,600 $ 833 $ 499 $ — $ (10) $ 7,223 Depreciation and amortization 81 39 23 198 11 — 352 Gain on sale of assets — — 208 — — — 208 Equity in earnings of unconsolidated affiliates — — 6 — — — 6 (Loss)/income before income taxes (1,056) 89 148 (37) (158) — (1,014) Net (loss)/income $ (1,056) $ 88 $ 148 $ (29) $ 82 $ — $ (767) Three months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 3,686 $ 2,809 $ 978 $ 478 $ — $ (5) $ 7,946 Depreciation and amortization 84 39 24 203 9 — 359 Equity in earnings of unconsolidated affiliates — — 6 — — — 6 Income/(loss) before income taxes 463 314 (205) (24) (140) — 408 Net income/(loss) $ 463 $ 316 $ (168) $ (4) $ (264) $ — $ 343 Nine months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 8,297 $ 8,647 $ 2,962 $ 1,434 $ — $ (29) $ 21,311 Depreciation and amortization 240 117 96 561 31 — 1,045 Impairment losses — — 15 — — — 15 (Loss)/gain on sale of assets (4) — 213 — — — 209 Equity in earnings of unconsolidated affiliates — — 13 — — — 13 Loss on debt extinguishment — — — — 260 — 260 Income/(loss) before income taxes 259 1,116 69 (59) (652) — 733 Net income/(loss) $ 259 $ 1,116 $ 90 $ (51) $ (932) $ — $ 482 Nine months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate Eliminations Total Revenue $ 8,235 $ 9,488 $ 3,244 $ 1,070 $ — $ (21) $ 22,016 Depreciation and amortization 257 122 73 442 27 — 921 Gain on sale of assets — 202 — — — — 202 Equity in earnings of unconsolidated affiliates — — 16 — — — 16 Income/(loss) before income taxes 1,532 (1,188) (684) (86) (440) — (866) Net income/(loss) $ 1,532 $ (1,187) $ (601) $ (66) $ (362) $ — $ (684) (a)

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Income Tax Rate The income tax provision consisted of the following: Three months ended September 30, Nine months ended September 30, (In millions, except rates) 2024 2023 2024 2023 (Loss)/Income before income taxes $ (1,014) $ 408 $ 733 $ (866) Income tax (benefit)/expense (247) 65 251 (182) Effective income tax rate 24.4 % 15.9 % 34.2 % 21.0 % For the three months ended September 30, 2024, the effective tax rate was higher than the statutory rate of 21%, primarily due to the state tax expense. For the nine months ended September 30, 2024, the effective tax rate was higher than the statutory rate of 21%, primarily due to the state tax expense and permanent differences. For the three months ended September 30, 2023, the effective tax rate was lower than the statutory rate of 21%, primarily due to a decrease in state tax expense resulting from a decrease in year-to-date financial statement losses. For the nine months ended September 30, 2023, the effective tax rate approximated the statutory rate of 21%, which includes the impact of state and foreign taxes. On September 12, 2024, Treasury and the IRS released proposed regulations that provide guidance on the application of the CAMT. The proposed regulations allow excluding of unrealized mark-to-market gains and losses, related to qualified hedge transactions, from adjusted financial statement income. The Company will continue to evaluate the applicable corporation status and the impact of the CAMT based on the proposed guidance. As of September 30, 2024, there is no impact on the Company’s provision for income taxes from the CAMT. Uncertain Tax Benefits As of September 30, 2024, NRG had a non-current tax liability of $70 million for uncertain tax benefits from positions taken on various federal and state income tax returns inclusive of accrued interest. For the nine months ended September 30, 2024, NRG accrued $1 million of interest relating to the uncertain tax benefits. As of September 30, 2024, NRG had cumulative interest and penalties related to these uncertain tax benefits of $4 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 2020. With few exceptions, state and Canadian income tax examinations are no longer open for years prior to 2015.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions NRG provides services to some of its related parties, which 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 services, 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 September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Revenues from Related Parties Included in Revenue Gladstone $ 1 $ 1 $ 2 $ 2 Ivanpah (a) 12 15 37 70 Midway-Sunset 1 — 3 2 Total $ 14 $ 16 $ 42 $ 74 (a) Also includes fees under project management agreements with each project company

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2024
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 September 30, 2024, all hedges under the first liens were out-of-the-money 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 15, Regulatory Matters , and Note 16, 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. In 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 Case Mirkin v. XOOM Energy (E.D.N.Y. Aug. 2019) — XOOM Energy is a defendant in a putative class action lawsuit pending in New York, alleging that XOOM Energy 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 Court denied XOOM's motion for summary judgment and granted class certification. The Second Circuit denied XOOM's request to appeal the class certification grants. XOOM prevailed in its challenge to Mirkin's expert reports. The Court granted XOOM's motion to exclude both reports on damages. As a result, Mirkin has no method to establish damages for its class. The Court asked for further briefing on whether class certification can stand in light of the recent ruling. This matter was known and accrued for at the time of the XOOM acquisition. 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 Direct Energy 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 April 12, 2023, the Court granted Direct Energy’s Motion to Transfer Venue, moving to the case to the Southern District of Texas. The parties are proceeding with written discovery; 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 matter is back at the trial court. The parties conducted fact and expert discovery and Direct Energy submitted its motion for summary judgment in August 2024. Sales Practice Lawsuit A Vivint Smart Home competitor has made a claim against Vivint Smart Home alleging, among other things, that Vivint Smart Home's sales representatives used deceptive sales practices. This matter was known and accrued for at the time of the Vivint Smart Home acquisition. CPI Security Systems, Inc. ("CPI") v. Vivint Smart Home, Inc. (W.D.N.C. Sept. 2020) 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 has fully briefed the appeal and oral argument is expected in early 2025. While Vivint Smart Home believes the CPI jury verdict is not legally or factually supported and is pursuing an appeal, there can be no assurance that such defense efforts will be successful. Patent Infringement Lawsuit SB IP Holdings LLC (“Skybell”) v. Vivint Smart Home, Inc. — On October 23, 2023, a jury in the U.S. District Court, Eastern District of Texas, Sherman Division, issued a verdict against the Company in favor of Skybell for $45 million in damages for patent infringement. The patents that were the basis for the claims made by Skybell were ruled invalid by the U.S. International Trade Commission in November 2021. The Company does not believe the verdict is legally supported and is pursuing appellate remedies along with any other legal options available. This matter was known and accrued for at the time of the Vivint Smart Home acquisition. Contract Dispute 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. The parties entered into a settlement agreement in May 2024, and the litigation was dismissed. There was no incremental impact to NRG as a result of the settlement. 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 dismissed from the multi-district litigation. 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 First Court of Appeals conditionally granted the generators' mandamus relief, ordering the trial court to grant the generator defendants' Motion to Dismiss. The plaintiffs challenged the ruling and the matters are stayed pending appeals by the various parties. The Company intends to vigorously defend these matters.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2024
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters Environmental regulatory matters are discussed within Note 16, 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 proceedings noted below, NRG and its subsidiaries are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows. California Station Power — As the result of unfavorable final and non-appealable litigation, the Company accrued a liability associated with consumption of station power at the Company's Encina power plant facility in California after August 30, 2010. The Company has established an appropriate accrual pending potential regulatory action by San Diego Gas & Electric regarding the Company's Encina facility. New York State Public Service Commission ("NYSPSC") - Notice of Apparent Violation — The NYSPSC issued an order referred to as the Retail Reset Order in December 2019 that limited ESCO's offers for electric and natural gas to three compliant products: guaranteed savings from the utility default rate, a fixed rate commodity product that is priced at no more than 5% greater than the trailing 12-month average utility supply rate or New York-sourced renewable energy that is at least 50% greater than the prevailing New York Renewable Energy Standard for load serving entities. The order effectively limited ESCO offers to natural gas customers to only the guaranteed savings and capped fixed term compliant products because no equivalent renewable energy product exists for natural gas. NRG took action to comply with the order when it became effective April 16, 2021. On January 8, 2024, the NYSPSC notified eight of NRG's retail energy suppliers (serving both electricity and natural gas) of alleged non-compliance with New York regulatory requirements. Among other items, the notices allege that the NRG suppliers did not transition existing residential customers to one of the three compliant products authorized by the NYSPSC following the effective date of the order. NRG responded to the notices in February 2024. The Company believes it has complied with the Retail Reset Order and does not agree with the NYSPSC's assertions made in the notice. The outcome of this process has the potential to negatively impact the retail business in New York.

Environmental Matters

Environmental Matters	9 Months Ended
	Sep. 30, 2024
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 use and discharge, and threatened and endangered species including four rules promulgated during the second quarter of 2024. 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 — The attention in recent years on GHG emissions has resulted in federal and state regulations. In 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 9, 2024, the EPA promulgated a rule that repealed the ACE rule and significantly revised the manner in which new combustion-turbine and existing steam EGU's GHG emissions will be regulated including capturing and storing/sequestering CO 2 in some instances. This rule has been challenged by numerous parties in the D.C. Circuit including 27 states with 22 states intervening in support of the rule. The Company anticipates that the new U.S. presidential administration will revisit this rule. Cross-State Air Pollution Rule ("CSAPR") — On March 15, 2023, the EPA signed and released a prepublication version 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 promulgated this rule. 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 several other states. On June 27, 2024, the U.S. Supreme Court stayed the final rule in the 11 states where the rule had not already been stayed. 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. The Company anticipates that the new U.S. presidential administration will revisit this rule. Regional Haze Proposal — In 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. Mercury and Air Toxics Standards (“MATS”) — On May 7, 2024, the EPA promulgated a final rule that amends the MATS rule by, among other things, increasing the stringency of the filterable particulate matter standard at coal-burning units. The deadline for complying with this more stringent standard is 2027. Twenty-three states have challenged this rule in the D.C. Circuit. Accordingly, the outcome of this rulemaking is uncertain. The Company anticipates that the new U.S. presidential administration will revisit this rule. Water ELG — In 2015, the EPA revised the 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, 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. On May 9, 2024, the EPA promulgated a rule that revises the ELG by, among other things, further restricting the discharge of (i) FGD wastewater, (ii) bottom ash transport water, and (iii) combustion residual leachate. The rule was challenged in numerous courts, but the cases have been consolidated in the Eighth Circuit of the United States Court of Appeals. The outcome of the legal challenges is uncertain. The Company anticipates that the new U.S. presidential administration will revisit this rule. Byproducts

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (767)	$ 343	$ 482	$ (684)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	9 Months Ended
	Sep. 30, 2024 shares	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		During the three months ended September 30, 2024, the following directors or officers of the Company adopted or terminated a 'Rule 10b5-1 trading arrangement' or 'non-Rule 10b5-1 trading arrangement,' as each term is defined in Item 408(a) of Regulation S-K, as described in the table below: Name Title Date Adopted Character of Trading Arrangement Aggregate Number of Shares of Common Stock to be Purchased or Sold Pursuant to Trading Arrangement (a) Duration Date Terminated Robert Gaudette Executive Vice President, NRG Business 9/6/2024 Rule 10b5-1 Trading Arrangement Up to 60,000 shares to be Sold 1/2/2025-2/28/2025 N/A Woo-Sung Chung Executive Vice President and Chief Financial Officer 9/13/2024 Rule 10b5-1 Trading Arrangement Up to 20,000 (b) shares to be Sold 1/13/2025-3/1/2025 N/A (a) Potential sales may be subject to certain price limitations set forth in the 10b5-1 plans and therefore actual number of shares sold could vary if certain minimum stock prices are not met (b) Represents approximate number of shares to be sold based on outstanding awards expected to vest during the period, where certain underlying performance share awards are being calculated at target. Actual number of shares to be sold will depend on actual vesting, the number of shares withheld by NRG to satisfy tax withholding obligations and vesting of dividend equivalent rights
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Robert Gaudette [Member]
Trading Arrangements, by Individual
Name	Robert Gaudette
Title	Executive Vice President, NRG Business
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	9/6/2024
Expiration Date	2/28/2025
Arrangement Duration	57 days
Rasesh Patel [Member]
Trading Arrangements, by Individual
Aggregate Available	60,000	60,000
Woo-Sung Chung [Member]
Trading Arrangements, by Individual
Name	Woo-Sung Chung
Title	Executive Vice President and Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	9/13/2024
Expiration Date	3/01/2025
Arrangement Duration	47 days
Aggregate Available	20,000	20,000

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Capitalized Contract Costs	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 the 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 expected period of benefit periodically and whenever events or circumstances indicate that the expected 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 depreciation and amortization in the condensed 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.
Use of Estimates	Use of Estimates
Reclassifications	Reclassifications Certain prior period amounts have been reclassified for comparative purposes. The reclassifications did not affect consolidated results of operations, net assets or consolidated cash flows. Presentation Adjustments
Credit Losses	Credit Losses Retail trade receivables are reported on the consolidated balance sheet net of the allowance for credit losses within accounts receivables, net. Long-term receivables are recorded net of allowance for credit losses in other non-current assets on the consolidated balance sheet. 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. 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 agreements and funds held within the Company's projects that are restricted in their uses.
Recent Accounting Developments — Guidance Not Yet Adopted	Recent Accounting Developments — Guidance Not Yet Adopted ASU 2023-07 – In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures , or ASU 2023-07. The guidance in ASU 2023-07 enhances reportable segment disclosure requirements by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit and loss, an amount and description of its composition for other segment items and interim disclosures of a reportable segment’s profit or loss and assets. The Company plans to adopt the new guidance for the annual period ending December 31, 2024 and subsequent interim periods thereafter. The guidance will be applied retrospectively for all prior periods presented in the financial statements. ASU 2023-09 – In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) – Improvements to Income Tax Disclosures , or ASU 2023-09. The guidance in ASU 2023-09 enhances income tax disclosures by requiring disclosure of specific categories in the effective tax rate reconciliation and additional information for reconciling items that meet a quantitative threshold. Further the amendments of ASU 2023-09 require certain disclosures on income tax expense and income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The amendments of ASU 2023-09 may be applied on a prospective or retrospective basis. The Company is currently evaluating the impact of adopting ASU 2023-09 on its disclosures. ASU 2024-03 – In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) – Disaggregation of Income Statement Expenses , or ASU 2024-03. The guidance in ASU 2024-03 requires more detailed information about specified categories of expenses included in certain captions presented on the face of the income statement. This ASU is effective for annual periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the impact of adopting ASU 2024-03 on its disclosures.
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. Vivint Smart Home operations 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 (loss)/income. 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 2023 Form 10-K.

Nature of Business and Basis _2

Nature of Business and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Adjustments Related to Capitalized Contract Costs	The following table presents adjustments within the condensed consolidated statement of operations for the three and nine months ended September 30, 2023 related to capitalized contract costs: (In millions) As Previously Presented Presentation Adjustments As Adjusted Three months ended September 30, 2023 Cost of operations (excluding depreciation and amortization shown below) $ 6,421 $ (15) $ 6,406 Depreciation and amortization 308 51 359 Selling, general and administrative costs 638 (36) 602 Nine months ended September 30, 2023 Cost of operations (excluding depreciation and amortization shown below) $ 20,161 $ (24) $ 20,137 Depreciation and amortization 813 108 921 Selling, general and administrative costs 1,586 (84) 1,502 The following table presents adjustments within the condensed consolidated statement of cash flows for the nine months ended September 30, 2023 related to capitalized contract costs: (In millions) As Previously Presented Presentation Adjustments As Adjusted Nine months ended September 30, 2023 Cash flows from operating activities: Amortization of capitalized contract costs $ — $ 108 $ 108 Changes in other working capital (985) (108) (1,093)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Components of Depreciation and Amortization in the Statement Of Income	The Company's depreciation and amortization included in the condensed consolidated statement of operations consisted of the following: Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Amortization of capitalized contract costs related to fulfillment $ 34 $ 14 $ 82 $ 20 Amortization of capitalized contract costs related to customer acquisition 57 37 149 88 Amortization of customer relationships and other intangible assets 192 244 610 623 Depreciation of property, plant and equipment 69 64 204 190 Total depreciation and amortization $ 352 $ 359 $ 1,045 $ 921
Activity in Allowance for Credit Losses	The following table represents the activity in the allowance for credit losses for the three and nine months ended September 30, 2024 and 2023: Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Beginning balance $ 127 $ 120 $ 145 $ 133 Acquired balance from Vivint Smart Home — — — 22 Provision for credit losses 95 85 228 165 Write-offs (74) (59) (252) (203) Recoveries collected 9 9 28 30 Other 7 3 15 11 Ending balance $ 164 $ 158 $ 164 $ 158
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) September 30, 2024 December 31, 2023 Property, plant and equipment accumulated depreciation $ 1,470 $ 1,295 Customer relationships and other intangible assets accumulated amortization 3,435 2,994
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) September 30, 2024 December 31, 2023 Cash and cash equivalents $ 1,104 $ 541 Funds deposited by counterparties 12 84 Restricted cash 10 24 Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows $ 1,126 $ 649
Schedule of Goodwill	The following table represents the changes in goodwill during the nine months ended September 30, 2024: (In millions) Texas East West/Services/Other Vivint Smart Home Total Balance as of December 31, 2023 $ 643 $ 721 $ 221 $ 3,494 $ 5,079 Impairment — — (15) — (15) Sale of Airtron — — (44) — (44) Foreign currency translation adjustments — — (2) — (2) Balance as of September 30, 2024 $ 643 $ 721 $ 160 $ 3,494 $ 5,018

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2024
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 nine months ended September 30, 2024 and 2023: Three months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 2,235 $ 616 $ 349 $ 499 $ (4) $ 3,695 Business 996 1,852 411 — — 3,259 Total retail revenue (b) 3,231 2,468 760 499 (4) 6,954 Energy revenue (b) 12 67 52 — (3) 128 Capacity revenue (b) — 40 8 — (1) 47 Mark-to-market for economic hedging activities (c) — 1 6 — 1 8 Contract amortization — (7) (1) — — (8) Other revenue (b) 58 31 8 — (3) 94 Total revenue 3,301 2,600 833 499 (10) 7,223 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 14 13 — — 27 Less: Realized and unrealized ASC 815 revenue 19 33 18 — (1) 69 Total revenue from contracts with customers $ 3,282 $ 2,553 $ 802 $ 499 $ (9) $ 7,127 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 6 $ — $ — $ — $ 6 Energy revenue — 9 12 — (3) 18 Capacity revenue — 17 — — — 17 Other revenue 19 — — — 1 20 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Three months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 2,397 $ 544 $ 390 $ 478 $ (1) $ 3,808 Business 1,092 2,089 532 — — 3,713 Total retail revenue (b) 3,489 2,633 922 478 (1) 7,521 Energy revenue (b) 51 152 59 — (1) 261 Capacity revenue (b) — 64 (4) — (1) 59 Mark-to-market for economic hedging activities (c) — (60) (10) — — (70) Contract amortization — (6) 1 — — (5) Other revenue (b) 146 26 10 — (2) 180 Total revenue 3,686 2,809 978 478 (5) 7,946 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 8 10 — — 18 Less: Realized and unrealized ASC 815 revenue 16 58 (7) — — 67 Total revenue from contracts with customers $ 3,670 $ 2,743 $ 975 $ 478 $ (5) $ 7,861 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 14 $ — $ — $ — $ 14 Energy revenue — 77 — — — 77 Capacity revenue — 27 — — — 27 Other revenue 16 — 3 — — 19 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Nine months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate/Eliminations Total Retail revenue: Home (a) $ 5,361 $ 1,855 $ 1,362 $ 1,434 $ (12) $ 10,000 Business 2,740 6,402 1,385 — — 10,527 Total retail revenue (b) 8,101 8,257 2,747 1,434 (12) 20,527 Energy revenue (b) 35 194 170 — (9) 390 Capacity revenue (b) — 120 16 — (3) 133 Mark-to-market for economic hedging activities (c) — 15 14 — 3 32 Contract amortization — (23) (2) — — (25) Other revenue (b) 161 84 17 — (8) 254 Total revenue 8,297 8,647 2,962 1,434 (29) 21,311 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 36 38 — — 74 Less: Realized and unrealized ASC 815 revenue 29 165 60 — (4) 250 Total revenue from contracts with customers $ 8,268 $ 8,446 $ 2,864 $ 1,434 $ (25) $ 20,987 (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 Vivint Smart Home Corporate/Eliminations Total Retail revenue $ — $ 25 $ — $ — $ — $ 25 Energy revenue — 67 50 — (8) 109 Capacity revenue — 58 — — — 58 Other revenue 29 — (4) — 1 26 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 Nine months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate/Eliminations Total Retail revenue: Home (b) $ 5,196 $ 1,641 $ 1,421 $ 1,070 $ (1) $ 9,327 Business 2,646 7,366 1,572 — — 11,584 Total retail revenue (c) 7,842 9,007 2,993 1,070 (1) 20,911 Energy revenue (c) 71 254 147 — — 472 Capacity revenue (c) — 154 (3) — (1) 150 Mark-to-market for economic hedging activities (d) — 27 80 — (11) 96 Contract amortization — (24) — — — (24) Other revenue (c) 322 70 27 — (8) 411 Total revenue 8,235 9,488 3,244 1,070 (21) 22,016 Less: Revenues accounted for under topics other than ASC 606 and ASC 815 — 13 26 — — 39 Less: Realized and unrealized ASC 815 revenue 28 270 97 — (10) 385 Total revenue from contracts with customers $ 8,207 $ 9,205 $ 3,121 $ 1,070 $ (11) $ 21,592 (a) Includes results of operations following the acquisition date of March 10, 2023 (b) Home includes Services (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 $ — $ 57 $ — $ — $ — $ 57 Energy revenue — 137 10 — 1 148 Capacity revenue — 50 — — — 50 Other revenue 28 (1) 7 — — 34 (d) 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 September 30, 2024 and December 31, 2023: (In millions) September 30, 2024 December 31, 2023 Capitalized contract costs ( included in Prepayments and other current assets and Other non-current assets) $ 1,173 $ 706 Accounts receivable, net - Contracts with customers 3,181 3,395 Accounts receivable, net - Accounted for under topics other than ASC 606 74 136 Accounts receivable, net - Affiliate 3 11 Total accounts receivable, net $ 3,258 $ 3,542 Unbilled revenues (included within Accounts receivable, net - Contracts with customers) $ 1,318 $ 1,493 Deferred revenues (a) 1,680 1,634 (a) Deferred revenues from contracts with customers were approximately $1.6 billion as of both September 30, 2024 and December 31, 2023

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [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

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2024
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: September 30, 2024 December 31, 2023 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value Convertible Senior Notes $ 232 $ 515 $ 575 $ 739 Other long-term debt, including current portion 10,497 10,412 10,219 9,835 Total long-term debt, including current portion (a) $ 10,729 $ 10,927 $ 10,794 $ 10,574 (a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt in the Company's consolidated balance sheets
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: September 30, 2024 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 26 $ — $ 26 $ — Derivative assets: Interest rate contracts 2 — 2 — Foreign exchange contracts 5 — 5 — Commodity contracts 4,196 626 3,384 186 Equity securities measured using net asset value practical expedient (classified within other non-current assets) 6 Total assets $ 4,235 $ 626 $ 3,417 $ 186 Derivative liabilities: Interest rate contracts $ 30 $ — $ 30 $ — Foreign exchange contracts 2 — 2 — Commodity contracts 3,588 654 2,722 212 Consumer Financing Program 200 — — 200 Total liabilities $ 3,820 $ 654 $ 2,754 $ 412 December 31, 2023 Fair Value (In millions) Total Level 1 Level 2 Level 3 Investments in securities (classified within other current and non-current assets) $ 21 $ — $ 21 $ — Derivative assets: Interest rate contracts 12 — 12 — Foreign exchange contracts 5 — 5 — Commodity contracts 6,138 1,334 4,470 334 Equity securities measured using net asset value practical expedient (classified within other non-current assets) 6 Total assets $ 6,182 $ 1,334 $ 4,508 $ 334 Derivative liabilities: Interest rate contracts $ 8 $ — $ 8 $ — Foreign exchange contracts 9 — 9 — Commodity contracts 5,356 1,413 3,728 215 Consumer Financing Program 134 — — 134 Total liabilities $ 5,507 $ 1,413 $ 3,745 $ 349
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 nine months ended September 30, 2024 and 2023, 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 September 30, 2024 Three months ended September 30, 2023 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Beginning balance $ 121 $ 905 $ 119 $ 505 Total (losses)/gains realized/unrealized included in earnings (83) 5 (120) (172) Purchases (38) (115) (7) 25 Transfers into Level 3 (b) (19) (374) (2) 64 Transfers out of Level 3 (b) (7) — (16) (1) Ending balance $ (26) $ 421 $ (26) $ 421 (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 $ (41) $ 75 $ (70) $ (56) (a) Consists of derivative assets and liabilities, net, excluding derivatives liabilities from the Consumer Financing Program, which are presented in a separate table below (b) Transfers into/out of Level 3 within the fair value hierarchy are related to the availability of consensus pricing and external broker quotes and are valued as of the end of the reporting period. All transfers in/out of Level 3 are from/to Level 2
Reconciliation of contractual obligations of Consumer Financing Program recognized at fair value	The following table reconciles, for the three and nine months ended September 30, 2024 and 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 September 30, 2024 Three months ended September 30, 2023 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Beginning balance $ (151) $ (115) $ (134) $ — Contractual obligations added from the acquisition of Vivint Smart Home — — — (112) New contractual obligations (63) (33) (121) (55) Settlements 21 21 64 43 Total losses included in earnings (7) (1) (9) (4) Ending balance $ (200) $ (128) $ (200) $ (128)
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 September 30, 2024 and December 31, 2023: September 30, 2024 Fair Value Input/Range (In millions, except as noted) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 38 $ 27 Discounted Cash Flow Forward Market Price ($ per MMBtu) $ 1 $ 13 $ 4 Power Contracts 75 138 Discounted Cash Flow Forward Market Price ($ per MWh) 0 131 41 Capacity Contracts 27 12 Discounted Cash Flow Forward Market Price ($ per MW/Day) 20 649 207 RECs 31 9 Discounted Cash Flow Forward Market Price ($ per Certificate) 2 245 16 FTRs 15 26 Discounted Cash Flow Auction Prices ($ per MWh) (38) 8,434 0 Consumer Financing Program — 200 Discounted Cash Flow Collateral Default Rates 0.25 % 100.00 % 10.90 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.86 % Discounted Cash Flow Credit Loss Rates 4.70 % 60.00 % 13.88 % $ 186 $ 412 December 31, 2023 Fair Value Input/Range (In millions, except as noted) Assets Liabilities Valuation Technique Significant Unobservable Input Low High Weighted Average Natural Gas Contracts $ 39 $ 65 Discounted Cash Flow Forward Market Price ($ per MMBtu) $ 1 $ 15 $ 3 Power Contracts 197 66 Discounted Cash Flow Forward Market Price ($ per MWh) 1 210 47 Capacity Contracts 21 33 Discounted Cash Flow Forward Market Price ($ per MW/Day) 49 658 285 RECs 58 14 Discounted Cash Flow Forward Market Price ($ per Certificate) 2 320 15 FTRs 19 37 Discounted Cash Flow Auction Prices ($ per MWh) (58) 252 0 Consumer Financing Program — 134 Discounted Cash Flow Collateral Default Rates 0.43 % 93.30 % 8.12 % Discounted Cash Flow Collateral Prepayment Rates 2.00 % 3.00 % 2.95 % Discounted Cash Flow Credit Loss Rates 6.00 % 60.00 % 12.57 % $ 334 $ 349
Fair value inputs, sensitivity analysis	The following table provides sensitivity of fair value measurements to increases/(decreases) in significant, unobservable inputs as of September 30, 2024 and December 31, 2023: Significant Unobservable Input Position Change In Input Impact on Fair Value Measurement Forward Market Price Natural Gas/Power/Capacity/RECs Buy Increase/(Decrease) Higher/(Lower) Forward Market Price Natural Gas/Power/Capacity/RECs 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) Credit Loss 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 75 % Financial institutions 25 Total as of September 30, 2024 100 % Net Exposure (a)(b) Category by Counterparty Credit Quality (% of Total) Investment grade 59 % Non-investment grade/Non-Rated 41 Total as of September 30, 2024 100 % (a) Counterparty credit exposure excludes 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

Accounting for Derivative Ins_2

Accounting for Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity	The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception, as of September 30, 2024 and December 31, 2023. 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 September 30, 2024 December 31, 2023 Emissions Short Ton 1 — RECs Certificates 12 12 Coal Short Ton 11 9 Natural Gas MMBtu 759 838 Oil Barrels 1 — Power MWh 206 201 Interest Dollars 1,700 1,000 Foreign Exchange Dollars 433 548 Consumer Financing Program Dollars 1,275 1,116
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) September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Derivatives Not Designated as Cash Flow or Fair Value Hedges: Interest rate contracts - current $ 2 $ 12 $ 1 $ — Interest rate contracts - long-term — — 29 8 Foreign exchange contracts - current 4 3 1 4 Foreign exchange contracts - long-term 1 2 1 5 Commodity contracts - current 2,450 3,847 2,234 3,922 Commodity contracts - long-term 1,746 2,291 1,354 1,434 Consumer Financing Program - short-term — — 115 93 Consumer Financing Program - long-term — — 85 41 Total Derivatives Not Designated as Cash Flow or Fair Value Hedges $ 4,203 $ 6,155 $ 3,820 $ 5,507
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 September 30, 2024 Interest rate contracts: Derivative assets $ 2 $ (2) $ — $ — Derivative liabilities (30) 2 — (28) Total interest rate contracts $ (28) $ — $ — $ (28) Foreign exchange contracts: Derivative assets $ 5 $ (1) $ — $ 4 Derivative liabilities (2) 1 — (1) Total foreign exchange contracts $ 3 $ — $ — $ 3 Commodity contracts: Derivative assets $ 4,196 $ (3,224) $ (6) $ 966 Derivative liabilities (3,588) 3,224 166 (198) Total commodity contracts $ 608 $ — $ 160 $ 768 Consumer Financing Program: Derivative liabilities $ (200) $ — $ — $ (200) Total derivative instruments $ 383 $ — $ 160 $ 543 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, 2023 Interest rate contracts: Derivative assets $ 12 $ (8) $ — $ 4 Derivative liabilities (8) 8 — — Total interest rate contracts $ 4 $ — $ — $ 4 Foreign exchange contracts: Derivative assets $ 5 $ (5) $ — $ — Derivative liabilities (9) 5 — (4) Total foreign exchange contracts $ (4) $ — $ — $ (4) Commodity contracts: Derivative assets $ 6,138 $ (4,926) $ (74) $ 1,138 Derivative liabilities (5,356) 4,926 145 (285) Total commodity contracts $ 782 $ — $ 71 $ 853 Consumer Financing Program: Derivative liabilities $ (134) $ — $ — $ (134) Total derivative instruments $ 648 $ — $ 71 $ 719
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 September 30, 2024 Interest rate contracts: Derivative assets $ 2 $ (2) $ — $ — Derivative liabilities (30) 2 — (28) Total interest rate contracts $ (28) $ — $ — $ (28) Foreign exchange contracts: Derivative assets $ 5 $ (1) $ — $ 4 Derivative liabilities (2) 1 — (1) Total foreign exchange contracts $ 3 $ — $ — $ 3 Commodity contracts: Derivative assets $ 4,196 $ (3,224) $ (6) $ 966 Derivative liabilities (3,588) 3,224 166 (198) Total commodity contracts $ 608 $ — $ 160 $ 768 Consumer Financing Program: Derivative liabilities $ (200) $ — $ — $ (200) Total derivative instruments $ 383 $ — $ 160 $ 543 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, 2023 Interest rate contracts: Derivative assets $ 12 $ (8) $ — $ 4 Derivative liabilities (8) 8 — — Total interest rate contracts $ 4 $ — $ — $ 4 Foreign exchange contracts: Derivative assets $ 5 $ (5) $ — $ — Derivative liabilities (9) 5 — (4) Total foreign exchange contracts $ (4) $ — $ — $ (4) Commodity contracts: Derivative assets $ 6,138 $ (4,926) $ (74) $ 1,138 Derivative liabilities (5,356) 4,926 145 (285) Total commodity contracts $ 782 $ — $ 71 $ 853 Consumer Financing Program: Derivative liabilities $ (134) $ — $ — $ (134) Total derivative instruments $ 648 $ — $ 71 $ 719
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 consolidated 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 September 30, Nine months ended September 30, Unrealized mark-to-market results 2024 2023 2024 2023 Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges $ (414) $ (522) $ 39 $ (1,519) Reversal of acquired (gain)/loss positions related to economic hedges (8) (6) (3) 4 Net unrealized (losses)/gains on open positions related to economic hedges (1,208) 475 (319) (418) Total unrealized mark-to-market (losses) for economic hedging activities (1,630) (53) (283) (1,933) Reversal of previously recognized unrealized (gains)/losses on settled positions related to trading activity (1) — (1) 11 Net unrealized (losses)/gains on open positions related to trading activity (4) (1) 1 13 Total unrealized mark-to-market (losses)/gains for trading activity (5) (1) — 24 Total unrealized (losses) - commodities and foreign exchange $ (1,635) $ (54) $ (283) $ (1,909) Three months ended September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Total impact to statement of operations - interest rate contracts $ (49) $ 8 $ (31) $ 32 Unrealized gains/(losses) included in revenues - commodities $ 3 $ (71) $ 32 $ 120 Unrealized (losses)/gains included in cost of operations - commodities (1,633) 8 (321) (2,024) Unrealized (losses)/gains included in cost of operations - foreign exchange (5) 9 6 (5) Total impact to statement of operations - commodities and foreign exchange $ (1,635) $ (54) $ (283) $ (1,909) Total impact to statement of operations - Consumer Financing Program $ (7) $ (1) $ (9) $ (4)

Long-term Debt and Finance Le_2

Long-term Debt and Finance Leases (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Long-term Debt and Finance Leases	Long-term debt and finance leases consisted of the following: (In millions, except rates) September 30, 2024 December 31, 2023 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 480 480 3.875 Convertible Senior Notes, due 2048 (a) 232 575 2.750 Senior Secured First Lien Notes, due 2024 — 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 740 740 7.000 Term Loan, due 2031 871 — SOFR + 2.000 Tax-exempt bonds 466 466 1.250 - 4.750 Subtotal recourse debt 8,148 8,220 Non-recourse debt: Vivint Senior Notes, due 2029 800 800 5.750 Vivint Senior Secured Notes, due 2027 600 600 6.750 Vivint Senior Secured Term Loan, due 2028 1,310 1,320 SOFR + 2.750 Subtotal all Vivint non-recourse debt 2,710 2,720 Subtotal long-term debt (including current maturities) 10,858 10,940 Finance leases 11 19 various Subtotal long-term debt and finance leases (including current maturities) 10,869 10,959 Less current maturities (258) (620) Less debt issuance costs (60) (60) Discounts (129) (146) Total long-term debt and finance leases $ 10,422 $ 10,133 (a)
Schedule of Extinguishment of Debt	For the nine months ended September 30, 2024, a $260 million loss on debt extinguishment was recorded. (In millions, except percentages) Settlement Period Principal Repurchased Cash Paid (a) Average Repurchase Percentage March 2024 $ 92 $ 151 162.356% April 2024 251 452 179.454% Total Repurchases $ 343 $ 603 (a) Includes accrued interest of $1 million and $2 million for the March and April repurchases, respectively
Schedule of Debt Instrument, Interest Expense	The following table details the interest expense recorded in connection with the Convertible Senior Notes: Three months ended September 30, Nine months ended September 30, (In millions, except percentages) 2024 2023 2024 2023 Contractual interest expense $ 1 $ 4 $ 7 $ 12 Amortization of deferred finance costs — — 1 1 Total $ 1 $ 4 $ 8 $ 13 Effective Interest Rate 0.76 % 0.76 % 2.31 % 2.28 %

Investments Accounted for Usi_2

Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Tables)	9 Months Ended
	Sep. 30, 2024
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) September 30, 2024 December 31, 2023 Accounts receivable and Other current assets $ 2,457 $ 1,541 Current liabilities 154 153 Net assets $ 2,303 $ 1,388

Changes in Capital Structure (T

Changes in Capital Structure (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2023 650,000 267,330,470 (59,199,520) 208,130,950 Shares issued under LTIPs — 1,836,827 — 1,836,827 Shares issued under ESPP — — 145,562 145,562 Shares repurchased — — (5,181,424) (5,181,424) Partial settlement of Capped Call Options — — (2,588) (2,588) Retirement of treasury stock — (5,111,012) 5,111,012 — Balance as of September 30, 2024 650,000 264,056,285 (59,126,958) 204,929,327 Shares issued under LTIPs — 64,861 — 64,861 Shares issued under ESPP — — 96,508 96,508 Shares repurchased — — (2,524,323) (2,524,323) Retirement of treasury stock — (2,064,950) 2,064,950 — Balance as of October 31, 2024 650,000 262,056,196 (59,489,823) 202,566,373
Share Repurchases	The following table summarizes the share repurchases made under the $3.7 billion authorization through October 31, 2024: Total number of shares purchased Average price paid per share Amounts paid for shares purchased (in millions) 2023 Repurchases: Open market repurchases 5,054,798 $ 39.56 $ 200 Repurchases made under the accelerated share repurchase agreements 17,676,142 (b) 950 Total Share Repurchases during 2023 22,730,940 1,150 (a) 2024 Repurchases: Repurchases made under the accelerated share repurchase agreements 1,163,230 (b) — Open market repurchases (c) 4,018,194 $ 79.26 319 Total Share Repurchases during the nine months ended September 30, 2024 5,181,424 $ 319 (d) Open market repurchases October 1, 2024 through October 31, 2024 2,524,323 $ 89.23 225 Total Share Repurchases under the $3.7 billion authorization 30,436,687 $ 55.65 $ 1,694 (a) Excludes $10 million accrued for excise tax owed as of December 31, 2023 (b) Under the November 6, 2023 ASR, the Company received a total of 18,839,372 shares for an average price per share of $50.43, excluding the impact of the excise tax incurred. See discussion below for further information of the ASR agreements (c) Includes $3 million accrued as of September 30, 2024 (d) Excludes $3 million accrued for estimated excise tax owed as of September 30, 2024
Schedule of Retirement of Treasury Stock	The Company's accounting policy upon the formal retirement of treasury stock is to deduct its par value from common stock and to reflect any excess of cost over par value as a deduction from additional paid-in-capital. Total number of treasury shares retired Average price per share Carrying value of treasury shares retired (in millions) Shares retired during the first quarter of 2024 1,163,230 $ 32.67 $ 38 Shares retired during the second quarter of 2024 1,114,400 33.84 38 Shares retired during the third quarter of 2024 2,833,382 35.40 100 Total shares retired during the nine months ended September 30, 2024 5,111,012 $ 176

(Loss)_Income Per Share (Tables

(Loss)/Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
NRG's basic and diluted income/(loss per share	NRG's basic and diluted (loss)/income per share is shown in the following table: Three months ended September 30, Nine months ended September 30, (In millions, except per share data) 2024 2023 2024 2023 Basic (loss)/income per share: Net (loss)/income $ (767) $ 343 $ 482 $ (684) Less: Cumulative dividends attributable to Series A Preferred Stock 17 17 51 38 Net (loss)/income available for common stockholders $ (784) $ 326 $ 431 $ (722) Weighted average number of common shares outstanding - basic 207 230 207 230 (Loss)/income per weighted average common share — basic $ (3.79) $ 1.42 $ 2.08 $ (3.14) Diluted (loss)/income per share: Net (loss)/income $ (767) $ 343 $ 482 $ (684) Less: Cumulative dividends attributable to Series A Preferred Stock 17 17 51 38 Net (loss)/income available for common stockholders $ (784) $ 326 $ 431 $ (722) Weighted average number of common shares outstanding - basic 207 230 207 230 Incremental shares attributable to the issuance of equity compensation (treasury stock method) — 2 3 — Incremental shares attributable to the potential share settlements of the Convertible Senior Notes (if converted method) — — 3 — Weighted average number of common shares outstanding - dilutive 207 232 213 230 (Loss)/income per weighted average common share — diluted $ (3.79) $ 1.41 $ 2.02 $ (3.14)
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 (loss)/income per share: Three months ended September 30, Nine months ended September 30, (In millions of shares) 2024 2023 2024 2023 Equity compensation plans 5 — — 6 Potential share settlement of the Convertible Senior Notes 3 — — —

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 3,301 $ 2,600 $ 833 $ 499 $ — $ (10) $ 7,223 Depreciation and amortization 81 39 23 198 11 — 352 Gain on sale of assets — — 208 — — — 208 Equity in earnings of unconsolidated affiliates — — 6 — — — 6 (Loss)/income before income taxes (1,056) 89 148 (37) (158) — (1,014) Net (loss)/income $ (1,056) $ 88 $ 148 $ (29) $ 82 $ — $ (767) Three months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 3,686 $ 2,809 $ 978 $ 478 $ — $ (5) $ 7,946 Depreciation and amortization 84 39 24 203 9 — 359 Equity in earnings of unconsolidated affiliates — — 6 — — — 6 Income/(loss) before income taxes 463 314 (205) (24) (140) — 408 Net income/(loss) $ 463 $ 316 $ (168) $ (4) $ (264) $ — $ 343 Nine months ended September 30, 2024 (In millions) Texas East West/Services/Other Vivint Smart Home Corporate Eliminations Total Revenue $ 8,297 $ 8,647 $ 2,962 $ 1,434 $ — $ (29) $ 21,311 Depreciation and amortization 240 117 96 561 31 — 1,045 Impairment losses — — 15 — — — 15 (Loss)/gain on sale of assets (4) — 213 — — — 209 Equity in earnings of unconsolidated affiliates — — 13 — — — 13 Loss on debt extinguishment — — — — 260 — 260 Income/(loss) before income taxes 259 1,116 69 (59) (652) — 733 Net income/(loss) $ 259 $ 1,116 $ 90 $ (51) $ (932) $ — $ 482 Nine months ended September 30, 2023 (In millions) Texas East West/Services/Other Vivint Smart Home (a) Corporate Eliminations Total Revenue $ 8,235 $ 9,488 $ 3,244 $ 1,070 $ — $ (21) $ 22,016 Depreciation and amortization 257 122 73 442 27 — 921 Gain on sale of assets — 202 — — — — 202 Equity in earnings of unconsolidated affiliates — — 16 — — — 16 Income/(loss) before income taxes 1,532 (1,188) (684) (86) (440) — (866) Net income/(loss) $ 1,532 $ (1,187) $ (601) $ (66) $ (362) $ — $ (684) (a)

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Provision	The income tax provision consisted of the following: Three months ended September 30, Nine months ended September 30, (In millions, except rates) 2024 2023 2024 2023 (Loss)/Income before income taxes $ (1,014) $ 408 $ 733 $ (866) Income tax (benefit)/expense (247) 65 251 (182) Effective income tax rate 24.4 % 15.9 % 34.2 % 21.0 %

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2024
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 September 30, Nine months ended September 30, (In millions) 2024 2023 2024 2023 Revenues from Related Parties Included in Revenue Gladstone $ 1 $ 1 $ 2 $ 2 Ivanpah (a) 12 15 37 70 Midway-Sunset 1 — 3 2 Total $ 14 $ 16 $ 42 $ 74 (a) Also includes fees under project management agreements with each project company

Nature of Business and Basis _3

Nature of Business and Basis of Presentation - General (Details) customer in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) customer GW	Sep. 30, 2023 USD ($)
Business Acquisition [Line Items]
Generation capacity (in GW) | GW	13
Proceeds from credit facilities	$ 1,050	$ 3,020
Repayments of credit facilities	$ 1,050	3,020
Error Correction, Other
Business Acquisition [Line Items]
Proceeds from credit facilities		3,000
Repayments of credit facilities		$ 3,000
Residential Customers
Business Acquisition [Line Items]
Customers | customer	8

Nature of Business and Basis _4

Nature of Business and Basis of Presentation - Presentation Adjustments Related to Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)	$ 7,239	$ 6,406	$ 17,229	$ 20,137
Depreciation and amortization	352	359	1,045	921
Selling, general and administrative costs	$ 645	602	1,739	1,502
Amortization of capitalized contract costs			231	108
Changes in other working capital			$ (1,021)	(1,093)
As Previously Presented
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		6,421		20,161
Depreciation and amortization		308		813
Selling, general and administrative costs		638		1,586
Amortization of capitalized contract costs				0
Changes in other working capital				(985)
Presentation Adjustments | Reclassification, Other
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		(15)		(24)
Depreciation and amortization		51		108
Selling, general and administrative costs		$ (36)		(84)
Amortization of capitalized contract costs				108
Changes in other working capital				$ (108)

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Capitalized Contract Costs (Details)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Contract with customer, term	5 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Depreciation and Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Capitalized Contract Cost [Line Items]
Amortization of capitalized contract costs			$ 231	$ 108
Amortization of Intangible Assets	$ 192	$ 244	610	623
Depreciation of property, plant and equipment	69	64	204	190
Total depreciation and amortization	352	359	1,045	921
Contract Cost Fulfillment
Capitalized Contract Cost [Line Items]
Amortization of capitalized contract costs	34	14	82	20
Contract Cost, Acquisitions
Capitalized Contract Cost [Line Items]
Amortization of capitalized contract costs	$ 57	$ 37	$ 149	$ 88

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 127	$ 120	$ 145	$ 133
Acquired balance from Vivint Smart Home	0	0	0	22
Provision for credit losses	95	85	228	165
Write-offs	(74)	(59)	(252)	(203)
Recoveries collected	9	9	28	30
Other	7	3	15	11
Ending balance	$ 164	$ 158	$ 164	$ 158

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Other Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Property, plant and equipment accumulated depreciation	$ 1,470	$ 1,295
Customer relationships and other intangible assets accumulated amortization	$ 3,435	$ 2,994

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 1,104	$ 541
Funds deposited by counterparties	12	84
Restricted cash	10	24
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows	$ 1,126	$ 649	$ 675	$ 2,178

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Balance beginning of period	$ 5,079
Impairment	(15)
Sale of Airtron	(44)
Foreign currency translation adjustments	(2)
Balance end of period	5,018
Texas
Goodwill [Roll Forward]
Balance beginning of period	643
Impairment	0
Sale of Airtron	0
Foreign currency translation adjustments	0
Balance end of period	643
East
Goodwill [Roll Forward]
Balance beginning of period	721
Impairment	0
Sale of Airtron	0
Foreign currency translation adjustments	0
Balance end of period	721
West/Services/Other
Goodwill [Roll Forward]
Balance beginning of period	221
Impairment	(15)
Sale of Airtron	(44)
Foreign currency translation adjustments	(2)
Balance end of period	160
Vivint Smart Home
Goodwill [Roll Forward]
Balance beginning of period	3,494
Impairment	0
Sale of Airtron	0
Foreign currency translation adjustments	0
Balance end of period	$ 3,494

Revenue Recognition - Performan

Revenue Recognition - Performance Obligations Expected Timing of Satisfaction (Details) $ in Millions	Sep. 30, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 421
Revenue remaining performance obligation period	3 months
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	$ 1,400
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	$ 1,100
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	$ 757
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	$ 459
Revenue remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated future fixed fee performance obligations	$ 190
Revenue remaining performance obligation period	1 year

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 7,127	$ 7,861	$ 20,987	$ 21,592
Mark-to-market for economic hedging activities	(1,630)	(53)	(283)	(1,933)
Contract amortization			(231)	(108)
Revenue	7,223	7,946	21,311	22,016
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	27	18	74	39
Derivative revenue	(1,635)	(54)	(283)	(1,909)
Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(9)	(5)	(25)	(11)
Revenue	(10)	(5)	(29)	(21)
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	6,954	7,521	20,527	20,911
Derivative revenue	6	14	25	57
Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(4)	(1)	(12)	(1)
Derivative revenue	0	0	0	0
Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	128	261	390	472
Derivative revenue	18	77	109	148
Energy revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(3)	(1)	(9)	0
Derivative revenue	(3)	0	(8)	1
Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47	59	133	150
Derivative revenue	17	27	58	50
Capacity revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(1)	(3)	(1)
Derivative revenue	0	0	0	0
Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	8	(70)	32	96
Less: Realized and unrealized ASC 815 revenue	69	67	250	385
Derivative revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	1	0	3	(11)
Less: Realized and unrealized ASC 815 revenue	(1)	0	(4)	(10)
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	94	180	254	411
Contract amortization	(8)	(5)	(25)	(24)
Other revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(3)	(2)	(8)	(8)
Contract amortization	0	0	0	0
Total operating revenue
Disaggregation of Revenue [Line Items]
Revenue	7,223	7,946	21,311	22,016
Total operating revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(10)	(5)	(29)	(21)
Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	20	19	26	34
Other revenue, derivative | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Derivative revenue	1	0	1	0
Home | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,695	3,808	10,000	9,327
Home | Retail revenue | Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(4)	(1)	(12)	(1)
Business | Retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,259	3,713	10,527	11,584
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	3,282	3,670	8,268	8,207
Revenue	3,301	3,686	8,297	8,235
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	3,231	3,489	8,101	7,842
Derivative revenue	0	0	0	0
Texas | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	51	35	71
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	0	0	0
Less: Realized and unrealized ASC 815 revenue	19	16	29	28
Texas | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58	146	161	322
Contract amortization	0	0	0	0
Texas | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,301	3,686	8,297	8,235
Texas | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	19	16	29	28
Texas | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,235	2,397	5,361	5,196
Texas | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	996	1,092	2,740	2,646
East | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,553	2,743	8,446	9,205
Revenue	2,600	2,809	8,647	9,488
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	14	8	36	13
East | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,468	2,633	8,257	9,007
Derivative revenue	6	14	25	57
East | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	152	194	254
Derivative revenue	9	77	67	137
East | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40	64	120	154
Derivative revenue	17	27	58	50
East | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	1	(60)	15	27
Less: Realized and unrealized ASC 815 revenue	33	58	165	270
East | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31	26	84	70
Contract amortization	(7)	(6)	(23)	(24)
East | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,600	2,809	8,647	9,488
East | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	0	(1)
East | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	616	544	1,855	1,641
East | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,852	2,089	6,402	7,366
West/Services/Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	802	975	2,864	3,121
Revenue	833	978	2,962	3,244
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	13	10	38	26
West/Services/Other | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	760	922	2,747	2,993
Derivative revenue	0	0	0	0
West/Services/Other | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	59	170	147
Derivative revenue	12	0	50	10
West/Services/Other | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	(4)	16	(3)
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	6	(10)	14	80
Less: Realized and unrealized ASC 815 revenue	18	(7)	60	97
West/Services/Other | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	10	17	27
Contract amortization	(1)	1	(2)	0
West/Services/Other | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	833	978	2,962	3,244
West/Services/Other | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	0	3	(4)	7
West/Services/Other | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	349	390	1,362	1,421
West/Services/Other | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	411	532	1,385	1,572
Vivint Smart Home | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	499	478	1,434	1,070
Revenue	499	478	1,434	1,070
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0	0	0	0
Vivint Smart Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	499	478	1,434	1,070
Derivative revenue	0	0	0	0
Vivint Smart Home | Energy revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Derivative revenue	0	0	0	0
Vivint Smart Home | Capacity revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Derivative revenue	0	0	0	0
Vivint Smart Home | Derivative revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	0	0	0
Less: Realized and unrealized ASC 815 revenue	0	0	0	0
Vivint Smart Home | Other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Contract amortization	0	0	0	0
Vivint Smart Home | Total operating revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	499	478	1,434	1,070
Vivint Smart Home | Other revenue, derivative | Operating Segments
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	0	0
Vivint Smart Home | Home | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	499	478	1,434	1,070
Vivint Smart Home | Business | Retail revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

Revenue Recognition - Contract

Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Contract Assets and Liabilities [Line Items]
Capitalized contract costs (included in Prepayments and other current assets and Other non-current assets)	$ 1,173		$ 1,173		$ 706
Total accounts receivable, net	3,258		3,258		3,542
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)	1,318		1,318		1,493
Deferred revenues	1,680		1,680		1,634
Deferred revenues from contracts with customers	1,600		1,600		1,600
Revenue recognized	290	$ 310	511	$ 168
Accounts receivable, net - Contracts with customers
Schedule of Contract Assets and Liabilities [Line Items]
Total accounts receivable, net	3,181		3,181		3,395
Accounts receivable, net - Accounted for under topics other than ASC 606
Schedule of Contract Assets and Liabilities [Line Items]
Total accounts receivable, net	74		74		136
Accounts receivable, net - Affiliate
Schedule of Contract Assets and Liabilities [Line Items]
Total accounts receivable, net	$ 3		$ 3		$ 11

Acquisitions and Dispositions -

Acquisitions and Dispositions - Acquisitions Narrative (Details) $ / shares in Units, customer in Millions, $ in Millions		3 Months Ended	9 Months Ended
	Mar. 10, 2023 USD ($) customer $ / shares	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Business Acquisition [Line Items]
Proceeds from issuance of preferred stock, net of fees			$ 0	$ 635
Issuance of Series A Preferred Stock		$ 636
Proceeds from credit facilities			$ 1,050	3,020
Vivint Smart Home
Business Acquisition [Line Items]
Customers added (nearly) | customer	2
Acquisition, share price (in usd per share) | $ / shares	$ 12
Cash paid to acquire business	$ 2,609
Consideration	2,623
Acquisition costs				$ 38
Vivint Smart Home | Revolving Credit Facility
Business Acquisition [Line Items]
Proceeds from credit facilities	900
Vivint Smart Home | Series A Preferred Stock
Business Acquisition [Line Items]
Proceeds from issuance of preferred stock, net of fees	635
Issuance of Series A Preferred Stock	$ 650
Preferred stock, dividend rate, percentage	10.25%
Vivint Smart Home | Senior Secured First Lien Notes, due 2033 | Senior Notes
Business Acquisition [Line Items]
Proceeds from issuance of senior notes	$ 724
Debt issuance amount	$ 740
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 - Dispositions (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Sep. 16, 2024	Jan. 06, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Oct. 02, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale			$ 208	$ 209	$ 202
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
Airtron | Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business unit	$ 500
Working capital and other adjustments to proceeds	16
Proceeds from sale of business, net of working capital and other adjustments	484
Gain on sale of business	$ 208
Airtron | Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other | Airtron
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage, parent	100%
Gregory | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration						$ 102
Gregory | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gregory
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage, parent						100%

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	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	$ 10,858	$ 10,940
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	10,729	10,794
Carrying Amount | Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	232	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	10,497	10,219
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	10,927	10,574
Fair Value | Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	515	739
Fair Value | Other long-term debt, including current portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total long-term debt, including current portion	$ 10,412	$ 9,835

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in securities (classified within other current and non-current assets)	$ 26	$ 21
Measured using net asset value practical expedient:
Total assets	4,235	6,182
Derivative liabilities:
Derivative contracts	3,820	5,507
Interest rate contracts
Derivative assets:
Derivative contracts	2	12
Derivative liabilities:
Derivative contracts	30	8
Foreign exchange
Derivative assets:
Derivative contracts	5	5
Derivative liabilities:
Derivative contracts	2	9
Commodity contracts
Derivative assets:
Derivative contracts	4,196	6,138
Derivative liabilities:
Derivative contracts	3,588	5,356
Consumer Financing Program
Derivative liabilities:
Derivative contracts	200	134
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
Measured using net asset value practical expedient:
Total assets	626	1,334
Derivative liabilities:
Derivative contracts	654	1,413
Level 1 | Equity Securities
Measured using net asset value practical expedient:
Equity securities
Level 1 | Interest rate contracts
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 1 | Foreign exchange
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 1 | Commodity contracts
Derivative assets:
Derivative contracts	626	1,334
Derivative liabilities:
Derivative contracts	654	1,413
Level 1 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	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)	26	21
Measured using net asset value practical expedient:
Total assets	3,417	4,508
Derivative liabilities:
Derivative contracts	2,754	3,745
Level 2 | Equity Securities
Measured using net asset value practical expedient:
Equity securities
Level 2 | Interest rate contracts
Derivative assets:
Derivative contracts	2	12
Derivative liabilities:
Derivative contracts	30	8
Level 2 | Foreign exchange
Derivative assets:
Derivative contracts	5	5
Derivative liabilities:
Derivative contracts	2	9
Level 2 | Commodity contracts
Derivative assets:
Derivative contracts	3,384	4,470
Derivative liabilities:
Derivative contracts	2,722	3,728
Level 2 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	0	0
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
Derivative assets:
Derivative contracts	186	334
Measured using net asset value practical expedient:
Total assets	186	334
Derivative liabilities:
Derivative contracts	412	349
Level 3 | Equity Securities
Measured using net asset value practical expedient:
Equity securities
Level 3 | Interest rate contracts
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 3 | Foreign exchange
Derivative assets:
Derivative contracts	0	0
Derivative liabilities:
Derivative contracts	0	0
Level 3 | Commodity contracts
Derivative assets:
Derivative contracts	186	334
Derivative liabilities:
Derivative contracts	212	215
Level 3 | Consumer Financing Program
Derivative liabilities:
Derivative contracts	200	134
Net Asset Value | Equity Securities
Measured using net asset value practical expedient:
Equity securities	$ 6	$ 6

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - Derivatives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 121	$ 905	$ 119	$ 505
Total (losses)/gains realized/unrealized included in earnings	(83)	5	(120)	(172)
Purchases	(38)	(115)	(7)	25
Transfers into Level 3	(19)	(374)	(2)	64
Transfers out of Level 3	(7)	0	(16)	(1)
Ending balance	(26)	421	(26)	421
(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	$ (41)	$ 75	$ (70)	$ (56)

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Contractual Obligations From the Consumer Financing Program (Details) - Level 3 - Derivatives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 121	$ 905	$ 119	$ 505
New contractual obligations	38	115	7	(25)
Total losses included in earnings	83	(5)	120	172
Ending balance	(26)	421	(26)	421
Consumer Financing Program
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(151)	(115)	(134)	0
Contractual obligations added from the acquisition of Vivint Smart Home	0	0	0	(112)
New contractual obligations	(63)	(33)	(121)	(55)
Settlements	21	21	64	43
Total losses included in earnings	(7)	(1)	(9)	(4)
Ending balance	$ (200)	$ (128)	$ (200)	$ (128)

Fair Value of Financial Instr_7

Fair Value of Financial Instruments - Derivative Fair Value Measurements, Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Total derivative assets valued with prices provided by models and other valuation techniques (as a percent)	4%
Total derivative liabilities valued with prices provided by models and other valuation techniques (as a percent)	11%
Change in credit reserve	$ 2	$ 18

Fair Value of Financial Instr_8

Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Sep. 30, 2024 USD ($) certificate $ / MMBTU $ / MWd $ / MWh	Dec. 31, 2023 USD ($) certificate $ / MWh $ / MWd
Liabilities
Derivative liabilities	$ 3,820	$ 5,507
Commodity contracts
Assets
Derivative assets	4,196	6,138
Liabilities
Derivative liabilities	3,588	5,356
Interest rate contracts
Assets
Derivative assets	2	12
Liabilities
Derivative liabilities	30	8
Level 3
Assets
Derivative assets	186	334
Liabilities
Derivative liabilities	412	349
Level 3 | RECs | Fair Value, Recurring
Assets
Derivative assets	31	58
Liabilities
Derivative liabilities	$ 9	$ 14
Level 3 | RECs | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	2,000,000	2
Level 3 | RECs | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	245,000,000	320
Level 3 | RECs | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	16,000,000	15
Level 3 | Commodity contracts
Assets
Derivative assets	$ 186	$ 334
Liabilities
Derivative liabilities	212	215
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	38	39
Liabilities
Derivative liabilities	$ 27	$ 65
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	1,000,000	1
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	13,000,000	15
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	4,000,000	3
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 75	$ 197
Liabilities
Derivative liabilities	$ 138	$ 66
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	0	1
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	131,000,000	210
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	41,000,000	47
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 15	$ 19
Liabilities
Derivative liabilities	$ 26	$ 37
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	(38,000,000)	(58)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	8,434,000,000	252
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	0	0
Level 3 | Interest rate contracts
Assets
Derivative assets	$ 0	$ 0
Liabilities
Derivative liabilities	$ 0	$ 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	0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0470	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	0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.6000	0.6000
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0286	0.0295
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1388	0.1257
Level 3 | Interest rate contracts | Consumer financing program
Assets
Derivative assets	$ 0	$ 0
Liabilities
Derivative liabilities	$ 200	$ 134
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	0.0025	0.0043
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	1	0.9330
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	0.1090	0.0812
Level 3 | Capacity Contracts | Capacity Contracts | Fair Value, Recurring
Assets
Derivative assets	$ 27	$ 21
Liabilities
Derivative liabilities	$ 12	$ 33
Level 3 | Capacity Contracts | Capacity Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	20,000,000	49
Level 3 | Capacity Contracts | Capacity Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	649,000,000	658
Level 3 | Capacity Contracts | Capacity Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	207,000,000	285

Fair Value of Financial Instr_9

Fair Value of Financial Instruments - Counterparty Credit Risk (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Concentration of Credit Risk
Counterparty credit exposure to a portion of the Company's counterparties	$ 1,300
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties	128
Net counterparty credit exposure to a portion of the Company's counterparties	$ 1,200
Company's exposure before collateral expected to roll off (as a percent)	30%
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	$ 890
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)	59%
Non-Investment grade/Non-Rated
Concentration of Credit Risk
Net exposure (as a percent)	41%
Utilities, energy merchants, marketers and other
Concentration of Credit Risk
Net exposure (as a percent)	75%
Financial Institutions
Concentration of Credit Risk
Net exposure (as a percent)	25%

Accounting for Derivative Ins_3

Accounting for Derivative Instruments and Hedging Activities - Narrative (Details) - Interest Rate Swap - USD ($) $ in Millions	Nov. 08, 2024	Oct. 31, 2024	Sep. 30, 2024
Derivative [Line Items]
Derivative, notional amount			$ 700
Subsequent Event
Derivative [Line Items]
Derivative, notional amount	$ 700	$ 1,700
Term Loan
Derivative [Line Items]
Derivative, notional amount			$ 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	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) MMBTU MWh certificate T bbl	Dec. 31, 2023 USD ($) MWh MMBTU certificate T bbl
Emissions
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	1	0
RECs
Volumetric Underlying Derivative Transactions
Derivative, non-monetary notional amount (in shares) | certificate	12	12
Coal
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, mass (ton) | T	11	9
Natural Gas
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU	759	838
Oil
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount (in barrels) | bbl	1	0
Power
Volumetric Underlying Derivative Transactions
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MWh	206	201
Interest
Volumetric Underlying Derivative Transactions
Derivative, notional amount	$ 1,700	$ 1,000
Foreign Exchange
Volumetric Underlying Derivative Transactions
Derivative, notional amount	433	548
Consumer Financing Program
Volumetric Underlying Derivative Transactions
Derivative, notional amount	$ 1,275	$ 1,116

Accounting for Derivative Ins_5

Accounting for Derivative Instruments and Hedging Activities - Fair Value within the Derivative Instrument Valuation (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Liabilities	$ 3,820	$ 5,507
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Assets	4,203	6,155
Derivative Liabilities	3,820	5,507
Not Designated as Hedging Instrument | Interest rate contracts current
Derivative [Line Items]
Derivative Assets	2	12
Derivative Liabilities	1	0
Not Designated as Hedging Instrument | Interest rate contracts long-term
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	29	8
Not Designated as Hedging Instrument | Foreign exchange contracts - current
Derivative [Line Items]
Derivative Assets	4	3
Derivative Liabilities	1	4
Not Designated as Hedging Instrument | Foreign exchange contracts - long-term
Derivative [Line Items]
Derivative Assets	1	2
Derivative Liabilities	1	5
Not Designated as Hedging Instrument | Commodity contracts - current
Derivative [Line Items]
Derivative Assets	2,450	3,847
Derivative Liabilities	2,234	3,922
Not Designated as Hedging Instrument | Commodity contracts - long-term
Derivative [Line Items]
Derivative Assets	1,746	2,291
Derivative Liabilities	1,354	1,434
Not Designated as Hedging Instrument | Consumer Financing Program - short-term
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	115	93
Not Designated as Hedging Instrument | Consumer Financing Program - long-term
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	$ 85	$ 41

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	Sep. 30, 2024	Dec. 31, 2023
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash collateral received in support of energy risk management activities	$ (12)	$ (84)
Derivative liabilities	(3,820)	(5,507)
Cash Collateral Posted	449	441
Total Derivative Contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Gross Amounts of Recognized Assets / Liabilities	383	648
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	160	71
Net Amount	543	719
Interest rate contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	2	12
Derivative Instruments	(2)	(8)
Cash collateral received in support of energy risk management activities	0	0
Net Amount	0	4
Derivative liabilities	(30)	(8)
Derivative Instruments	2	8
Cash Collateral Posted	0	0
Net Amount	(28)	0
Gross Amounts of Recognized Assets / Liabilities	(28)	4
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	(28)	4
Foreign exchange
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	5	5
Derivative Instruments	(1)	(5)
Cash collateral received in support of energy risk management activities	0	0
Net Amount	4	0
Derivative liabilities	(2)	(9)
Derivative Instruments	1	5
Cash Collateral Posted	0	0
Net Amount	(1)	(4)
Gross Amounts of Recognized Assets / Liabilities	3	(4)
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	3	(4)
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	4,196	6,138
Derivative Instruments	(3,224)	(4,926)
Cash collateral received in support of energy risk management activities	(6)	(74)
Net Amount	966	1,138
Derivative liabilities	(3,588)	(5,356)
Derivative Instruments	3,224	4,926
Cash Collateral Posted	166	145
Net Amount	(198)	(285)
Gross Amounts of Recognized Assets / Liabilities	608	782
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	160	71
Net Amount	768	853
Consumer Financing Program
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative liabilities	(200)	(134)
Derivative Instruments	0	0
Cash Collateral Posted	0	0
Net Amount	$ (200)	$ (134)

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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Unrealized mark-to-market results
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$ (414)	$ (522)	$ 39	$ (1,519)
Reversal of acquired (gain)/loss positions related to economic hedges	(8)	(6)	(3)	4
Net unrealized (losses)/gains on open positions related to economic hedges	(1,208)	475	(319)	(418)
Total unrealized mark-to-market (losses) for economic hedging activities	(1,630)	(53)	(283)	(1,933)
Reversal of previously recognized unrealized (gains)/losses on settled positions related to trading activity	(1)	0	(1)	11
Net unrealized (losses)/gains on open positions related to trading activity	(4)	(1)	1	13
Total unrealized mark-to-market (losses)/gains for trading activity	(5)	(1)	0	24
Total unrealized (losses) - commodities and foreign exchange	(1,635)	(54)	(283)	(1,909)
Net unrealized gains (losses) on open positions related to economic hedges	(1,208)	475	(319)	(418)
Credit Risk Related Contingent Features
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	31		31
Additional collateral required	27		27
Adequate Assurance Clauses
Credit Risk Related Contingent Features
Derivative net liability position, collateral required for contracts with credit rating contingent feature	444		444
Commodities | Operating revenues
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	3	(71)	32	120
Commodities | Cost of operations
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	(1,633)	8	(321)	(2,024)
Foreign exchange | Cost of operations
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	(5)	9	6	(5)
Commodities and foreign exchange
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	(1,635)	(54)	(283)	(1,909)
Consumer financing program
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	(7)	(1)	(9)	(4)
Interest rate contracts
Unrealized mark-to-market results
Total unrealized (losses) - commodities and foreign exchange	$ (49)	$ 8	$ (31)	$ 32

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			9 Months Ended
	Nov. 01, 2024 $ / shares	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Nov. 08, 2024	Oct. 31, 2024	Oct. 30, 2024	Jun. 17, 2024	Apr. 16, 2024	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 10,858						$ 10,940
Finance leases			11						19
Subtotal long-term debt and finance leases (including current maturities)			10,869						10,959
Less current maturities			(258)						(620)
Less debt issuance costs			(60)						(60)
Discounts			(129)						(146)
Total long-term debt and finance leases			10,422						10,133
Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Interest rate, stated percentage								3.75%
Recourse Debt
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			8,148						8,220
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 2027 | Subsequent Event
Debt Instrument [Line Items]
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)			$ 480						480
Interest rate, stated percentage			3.875%
Recourse Debt | Convertible Senior Notes, due 2048
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)		$ 232	$ 232						575
Interest rate, stated percentage			2.75%
Convertible notes, conversion price (in usd per share) | $ / shares			$ 41.11
Conversion rate		0.0243220
Recourse Debt | Convertible Senior Notes, due 2048 | Subsequent Event
Debt Instrument [Line Items]
Convertible notes, conversion price (in usd per share) | $ / shares	$ 40.94
Conversion rate	0.0244241
Recourse Debt | Senior Secured First Lien Notes, due 2024
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 0						600
Interest rate, stated percentage			3.75%				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						740
Interest rate, stated percentage			7%
Recourse Debt | Term Loan, due 2031 | Revolving Credit Facility
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 871						0
Basis spread on variable rate			2%
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%
Non Recourse Debt
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 2,710						2,720
Non Recourse Debt | Vivint Senior Secured Notes, due 2027
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 600						600
Interest rate, stated percentage			6.75%
Non Recourse Debt | Vivint Senior Secured Notes, due 2027 | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage				6.75%		6.75%
Non Recourse Debt | Vivint Senior Notes, due 2029
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 800						800
Interest rate, stated percentage			5.75%
Non Recourse Debt | Vivint Senior Secured Term Loan, due 2028
Debt Instrument [Line Items]
Subtotal long-term debt (including current maturities)			$ 1,310						$ 1,320
Basis spread on variable rate			2.75%

Long-term Debt and Finance Le_4

Long-term Debt and Finance Leases - Issuance of Senior Notes (Details) - USD ($) $ in Millions		9 Months Ended
	Oct. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Nov. 08, 2024	Oct. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Proceeds from credit facilities		$ 1,050	$ 3,020
Borrowings outstanding		10,858				$ 10,940
Recourse Debt
Debt Instrument [Line Items]
Borrowings outstanding		8,148				8,220
Non Recourse Debt
Debt Instrument [Line Items]
Borrowings outstanding		$ 2,710				2,720
Senior Notes | Unsecured Debt | Subsequent Event
Debt Instrument [Line Items]
Debt issuance amount	$ 1,900
6.00% Senior Notes due 2033 | Unsecured Debt | Subsequent Event
Debt Instrument [Line Items]
Debt issuance amount	$ 925
Interest rate, stated percentage	6%
6.25% Senior Notes Due 2034 | Unsecured Debt | Subsequent Event
Debt Instrument [Line Items]
Debt issuance amount	$ 950
Interest rate, stated percentage	6.25%
New 5.75% Senior Notes Due 2029 | Unsecured Debt | Subsequent Event
Debt Instrument [Line Items]
Debt issuance amount					$ 798
Interest rate, stated percentage					5.75%
New 5.75% Senior Notes Due 2029 | Recourse Debt | Subsequent Event
Debt Instrument [Line Items]
Debt issuance amount	$ 798
Interest rate, stated percentage	5.75%
Credit agreement | Term Loan | Term Loan B Facility | Subsequent Event
Debt Instrument [Line Items]
Proceeds from credit facilities	$ 450
Vivint Senior Secured Notes, due 2027 | Non Recourse Debt
Debt Instrument [Line Items]
Interest rate, stated percentage		6.75%
Borrowings outstanding		$ 600				600
Vivint Senior Secured Notes, due 2027 | Non Recourse Debt | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage	6.75%			6.75%
Vivint Term Loans And Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Debt repurchased amount	$ 1,300
Senior Notes, due 2027 | Recourse Debt
Debt Instrument [Line Items]
Interest rate, stated percentage		6.625%
Borrowings outstanding		$ 375				$ 375
Senior Notes, due 2027 | Recourse Debt | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage					6.625%

Long-term Debt and Finance Le_5

Long-term Debt and Finance Leases - Senior Credit Facility (Details) - USD ($)	Oct. 30, 2024	Apr. 16, 2024
Senior Secured First Lien Notes, due 2024
Line of Credit Facility [Line Items]
Interest rate, stated percentage		3.75%
Term Loan B Facility | Credit agreement | Fed Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
Term Loan B Facility | Credit agreement | Fed Funds Rate | Subsequent Event
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Term Loan B Facility | Credit agreement | SOFR, Floor | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1%
Term Loan B Facility | Credit agreement | SOFR, Floor | Minimum | Subsequent Event
Line of Credit Facility [Line Items]
Basis spread on variable rate	1%
Term Loan B Facility | Credit agreement | SOFR
Line of Credit Facility [Line Items]
Basis spread on variable rate		0%
Term Loan B Facility | Credit agreement | SOFR | Subsequent Event
Line of Credit Facility [Line Items]
Basis spread on variable rate	0%
Term Loan B Facility | Credit agreement | SOFR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1%
Term Loan B Facility | Credit agreement | SOFR | Minimum | Subsequent Event
Line of Credit Facility [Line Items]
Basis spread on variable rate	1%
Term Loan B Facility | Credit agreement | SOFR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		2%
Term Loan B Facility | Credit agreement | SOFR | Maximum | Subsequent Event
Line of Credit Facility [Line Items]
Basis spread on variable rate	2%
Term Loan B Facility | Credit agreement | Term Loan
Line of Credit Facility [Line Items]
Credit facility borrowing available		$ 875,000,000
Term Loan B Facility | Credit agreement | Term Loan | Subsequent Event
Line of Credit Facility [Line Items]
Credit facility borrowing available	$ 450,000,000
Amortization rate	1%

Long-term Debt and Finance Le_6

Long-term Debt and Finance Leases - Convertible Senior Notes, Receivables Securitization Facilities and Senior Note Repayment (Details)

3 Months Ended

9 Months Ended

Nov. 01, 2024 $ / shares

Jun. 30, 2024 USD ($)

Jun. 30, 2024 USD ($)

Sep. 30, 2024 USD ($) counterparty $ / shares

Oct. 31, 2024 USD ($)

Jun. 21, 2024 USD ($)

Jun. 20, 2024 USD ($)

Jun. 17, 2024 USD ($)

Apr. 30, 2024 USD ($)

Apr. 16, 2024

Mar. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Debt Instrument [Line Items]

Borrowings outstanding

$ 10,858,000,000

$ 10,940,000,000

Recourse Debt

Debt Instrument [Line Items]

Borrowings outstanding

8,148,000,000

8,220,000,000

Aggregate principal redeemed

$ 343,000,000

Convertible Senior Notes, due 2048 | Recourse Debt

Debt Instrument [Line Items]

Convertible notes, conversion price (in usd per share) | $ / shares

$ 41.11

Conversion rate

0.0243220

Convertible notes, carrying amount

$ 231,000,000

572,000,000

Convertible notes, threshold percentage of stock price trigger

130%

Convertible notes, threshold trading days | counterparty

20

Convertible notes, consecutive trading days | counterparty

30

Capped call, convertible debt, conversion, premium

$ 257,000,000

$ 257,000,000

Borrowings outstanding

$ 232,000,000

232,000,000

$ 232,000,000

575,000,000

Capped calls option price

$ 257,000,000

Interest rate, stated percentage

2.75%

Aggregate principal redeemed

$ 251,000,000

$ 92,000,000

Convertible Senior Notes, due 2048 | Recourse Debt | Subsequent Event

Debt Instrument [Line Items]

Convertible notes, conversion price (in usd per share) | $ / shares

$ 40.94

Conversion rate

0.0244241

Receivables Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Revolving credit commitments

$ 2,300,000,000

$ 1,400,000,000

Outstanding borrowing

$ 0

Receivables Facility | Secured Debt | Letter of Credit

Debt Instrument [Line Items]

Letters of credit issued

$ 1,500,000,000

Senior Secured First Lien Notes, due 2024

Debt Instrument [Line Items]

Interest rate, stated percentage

3.75%

Senior Secured First Lien Notes, due 2024 | Recourse Debt

Debt Instrument [Line Items]

Borrowings outstanding

$ 0

600,000,000

Interest rate, stated percentage

3.75%

3.75%

Aggregate principal redeemed

$ 600,000,000

Senior Notes, due 2027 | Recourse Debt

Debt Instrument [Line Items]

Borrowings outstanding

$ 375,000,000

$ 375,000,000

Interest rate, stated percentage

6.625%

Senior Notes, due 2027 | Recourse Debt | Subsequent Event

Debt Instrument [Line Items]

Interest rate, stated percentage

6.625%

Aggregate principal redeemed

$ 375,000,000

Long-term Debt and Finance Le_7

Long-term Debt and Finance Leases - Interest Expense in Connection with Convertible Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Amortization of deferred finance costs			$ 32	$ 42
Convertible Senior Notes, due 2048
Debt Instrument [Line Items]
Contractual interest expense	$ 1	$ 4	7	12
Amortization of deferred finance costs	0	0	1	1
Total	$ 1	$ 4	$ 8	$ 13
Effective Interest Rate	0.76%	0.76%	2.31%	2.28%

Long-term Debt and Finance Le_8

Long-term Debt and Finance Leases - Senior Note Repurchases (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Loss on debt extinguishment			$ 0	$ 0	$ (260)	$ 0
Accrued interest	$ 2	$ 1
Recourse Debt
Debt Instrument [Line Items]
Principal Repurchased			$ 343		343
Cash paid					603
Recourse Debt | Convertible Senior Notes, due 2048
Debt Instrument [Line Items]
Loss on debt extinguishment					$ 260
Principal Repurchased	251	92
Cash paid	$ 452	$ 151
Average Repurchase Percentage	179.454%	162.356%

Long-term Debt and Finance Le_9

Long-term Debt and Finance Leases - Vivint Secured Notes Tender Offer and Vivint Unsecured Notes Exchange Offer (Details) - USD ($) $ in Millions	Nov. 08, 2024	Oct. 31, 2024	Oct. 30, 2024	Sep. 30, 2024
Vivint Senior Secured Notes, due 2027 | Non Recourse Debt
Debt Instrument [Line Items]
Interest rate, stated percentage				6.75%
Vivint Senior Secured Notes, due 2027 | Non Recourse Debt | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage	6.75%		6.75%
Aggregate principal redeemed	$ 11		$ 589
Vivint Senior Notes, due 2029 | Non Recourse Debt
Debt Instrument [Line Items]
Interest rate, stated percentage				5.75%
Debt instrument, aggregate principal				$ 798
New 5.75% Senior Notes Due 2029 | Unsecured Debt | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage		5.75%
Debt instrument, aggregate principal		$ 798

Long-term Debt and Finance L_10

Long-term Debt and Finance Leases - Vivint Term Loan Repricing (Details) - Term Loan - Vivint Credit Agreement	Apr. 10, 2024
Fed Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
SOFR, Floor
Line of Credit Facility [Line Items]
Basis spread on variable rate	1%
SOFR
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
SOFR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
SOFR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.75%

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	Sep. 30, 2024	Dec. 31, 2023
Investments Accounted for by the Equity Method
Accounts receivable and Other current assets	$ 8,611	$ 9,727
Current liabilities	7,348	9,500
Variable Interest Entity, Primary Beneficiary
Investments Accounted for by the Equity Method
Accounts receivable and Other current assets	2,457	1,541
Current liabilities	154	153
Net assets	$ 2,303	$ 1,388

Changes in Capital Structure -

Changes in Capital Structure - Narrative (Details) - USD ($)

1 Months Ended

3 Months Ended

9 Months Ended

11 Months Ended

12 Months Ended

Jun. 22, 2023

Oct. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

[1]

Mar. 31, 2024

Dec. 31, 2023

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2024

Dec. 31, 2023

Nov. 06, 2023

Jun. 30, 2023

Class of Stock [Line Items]

Preferred stock, shares authorized (in shares)

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

Common stock, shares authorized (in shares)

500,000,000

500,000,000

500,000,000

500,000,000

500,000,000

Share repurchases

$ 231,000,000

[1]

$ 91,000,000

$ 50,000,000

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%

Treasury Stock

Class of Stock [Line Items]

Share repurchases

$ 231,000,000

[1]

$ 91,000,000

$ 117,000,000

[2]

50,000,000

Additional Paid-In Capital

Class of Stock [Line Items]

Share repurchases

$ (117,000,000)

[2]

November 2023 Accelerated Share Repurchase Agreements

Class of Stock [Line Items]

Accelerated share repurchases, agreement amount

$ 950,000,000

Shares repurchased (in shares)

1,163,230

18,839,372

November 2023 Accelerated Share Repurchase Agreements | Treasury Stock

Class of Stock [Line Items]

Share repurchases

$ 833,000,000

November 2023 Accelerated Share Repurchase Agreements | Additional Paid-In Capital

Class of Stock [Line Items]

Share repurchases

$ 117,000,000

$ 117,000,000

Capital Allocation Plan, 2023

Class of Stock [Line Items]

Shares repurchased (in shares)

17,676,142

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%

Share repurchase program, authorized amount

$ 3,700,000,000

$ 2,700,000,000

Share repurchases

$ 319,000,000

$ 1,150,000,000

Shares repurchased (in shares)

5,181,424

22,730,940

Capital Allocation Plan, 2023 | Subsequent Event

Class of Stock [Line Items]

Share repurchase program, additional authorized amount

$ 1,000,000,000

Remaining amount recorded in additional paid in capital

2,000,000,000

Share repurchases

$ 1,694,000,000

Shares repurchased (in shares)

30,436,687

Capital Allocation Plan, Open Market Repurchases

Class of Stock [Line Items]

Share repurchases

$ 319,000,000

$ 200,000,000

Shares repurchased (in shares)

4,018,194

5,054,798

Capital Allocation Plan, Open Market Repurchases | Subsequent Event

Class of Stock [Line Items]

Share repurchases

$ 225,000,000

Shares repurchased (in shares)

2,524,323

[1] Includes excise tax accrued of $2 million and $1 million for the quarters ended September 30 and June 30, 2024, respectively Represents the final settlements of the November 6, 2023 ASR agreements. See Note 9, Changes in Capital Structure for additional information

Changes in Capital Structure _2

Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares	1 Months Ended	9 Months Ended
	Oct. 31, 2024	Sep. 30, 2024
Schedule of Stock by Class, Equity [Roll Forward]
Preferred, Balance as of beginning of period (in shares)	650,000	650,000
Preferred, Balance as of end of period (in shares)		650,000
Common, Balance as of beginning of period (in shares)	264,056,285	267,330,470
Treasury, Balance as of beginning of period (in shares)	(59,126,958)	(59,199,520)
Common, Outstanding, as of beginning of period (in shares)	204,929,327	208,130,950
Shares repurchased (in shares)		(5,181,424)
Partial settlement of Capped Call Options (in shares)		(2,588)
Common, Balance as of end of period (in shares)		264,056,285
Treasury, Balance as of end of period (in shares)		(59,126,958)
Common, Outstanding, as of end of period (in shares)		204,929,327
Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares repurchased (in shares)	(2,524,323)
Common, Outstanding, as of end of period (in shares)	202,566,373
Shares issued under LTIPs
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)		1,836,827
Shares issued under LTIPs | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)	64,861
Shares issued under ESPP
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)		145,562
Shares issued under ESPP | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)	96,508
Preferred Stock
Schedule of Stock by Class, Equity [Roll Forward]
Preferred, Balance as of beginning of period (in shares)	650,000	650,000
Preferred, Balance 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
Common Stock
Schedule of Stock by Class, Equity [Roll Forward]
Common, Balance as of beginning of period (in shares)	264,056,285	267,330,470
Partial settlement of Capped Call Options (in shares)		0
Retirement of treasury stock (in shares)		(5,111,012)
Common, Balance as of end of period (in shares)		264,056,285
Common Stock | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Retirement of treasury stock (in shares)	(2,064,950)
Common, Balance as of end of period (in shares)	262,056,196
Common Stock | Shares issued under LTIPs
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)		1,836,827
Common Stock | Shares issued under LTIPs | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under LTIPs (in shares)	64,861
Common Stock | Shares issued under ESPP | Subsequent Event
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 beginning of period (in shares)	(59,126,958)	(59,199,520)
Shares repurchased (in shares)		(5,181,424)
Partial settlement of Capped Call Options (in shares)		(2,588)
Retirement of treasury stock (in shares)		5,111,012
Treasury, Balance as of end of period (in shares)		(59,126,958)
Treasury Stock | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares repurchased (in shares)	(2,524,323)
Retirement of treasury stock (in shares)	2,064,950
Treasury, Balance as of end of period (in shares)	(59,489,823)
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)		145,562
Treasury Stock | Shares issued under ESPP | Subsequent Event
Schedule of Stock by Class, Equity [Roll Forward]
Shares issued under ESPP (in shares)	96,508

Changes in Capital Structure _3

Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) - USD ($)	1 Months Ended	3 Months Ended						9 Months Ended	11 Months Ended	12 Months Ended
	Oct. 31, 2024	Sep. 30, 2024		Jun. 30, 2024		Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Jun. 22, 2023
Schedule of Capitalization, Equity [Line Items]
Amounts paid for shares purchased		$ 231,000,000	[1]	$ 91,000,000	[1]		$ 50,000,000
Excise tax, accrued		2,000,000		$ 1,000,000				$ 2,000,000	$ 2,000,000
Subsequent Event
Schedule of Capitalization, Equity [Line Items]
Average price paid per share (in usd per share)	$ 55.65
Capital Allocation Plan, Open Market Repurchases
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)								4,018,194		5,054,798
Average price paid per share (in usd per share)								$ 79.26		$ 39.56
Amounts paid for shares purchased								$ 319,000,000		$ 200,000,000
Shares repurchased accrued		3,000,000						$ 3,000,000	3,000,000
Capital Allocation Plan, Open Market Repurchases | Subsequent Event
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	2,524,323
Average price paid per share (in usd per share)	$ 89.23
Amounts paid for shares purchased	$ 225,000,000
Capital Allocation Plan, Accelerated Repurchase Agreements
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)								1,163,230		17,676,142
Amounts paid for shares purchased								$ 0		$ 950,000,000
Capital Allocation Plan, 2023
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)								5,181,424		22,730,940
Amounts paid for shares purchased								$ 319,000,000		$ 1,150,000,000
Share repurchase program, authorized amount											$ 2,700,000,000	$ 3,700,000,000
Excise tax, accrued		$ 3,000,000						$ 3,000,000	$ 3,000,000	$ 10,000,000
Capital Allocation Plan, 2023 | Subsequent Event
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	30,436,687
Amounts paid for shares purchased	$ 1,694,000,000
November 2023 Accelerated Share Repurchase Agreements
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)						1,163,230			18,839,372
Average price paid per share (in usd per share)									$ 50.43
[1] Includes excise tax accrued of $2 million and $1 million for the quarters ended September 30 and June 30, 2024, respectively

Changes in Capital Structure _4

Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended							12 Months Ended
	Oct. 11, 2024	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2023
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)					$ 1.63				$ 1.51
Dividends per common share (in usd per share)			$ 0.4075	$ 0.4075	$ 0.4075	$ 0.3775	$ 0.3775	$ 0.3775
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.4075
Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)		$ 1.76
Common stock, annual dividend increase		8%
Minimum | Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage		7%
Maximum | Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage		9%

Changes in Capital Structure _5

Changes in Capital Structure - Treasury Stock Retirements (Details) - Treasury Stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock (in shares)	2,833,382	1,114,400	1,163,230	5,111,012
Average price paid per share (in usd per share)	$ 35.40	$ 33.84	$ 32.67
Retirement of treasury stock	$ 100	$ 38	$ 38	$ 176

Changes in Capital Structure _6

Changes in Capital Structure - Capped Call Options (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Option Indexed to Issuer's Equity [Line Items]
Borrowings outstanding		$ 10,858			$ 10,858		$ 10,940
Capped call options	[1]		$ 253
Other income, net		$ 5		$ 14	$ 38	$ 43
Convertible Senior Notes, due 2048 | Senior Notes
Option Indexed to Issuer's Equity [Line Items]
Capped call, convertible debt, conversion, premium			257
Borrowings outstanding			$ 232
Convertible Senior Notes Capped Calls | Senior Notes
Option Indexed to Issuer's Equity [Line Items]
Capped calls, strike price (in usd per share)			$ 41.11
Capped call cap price (in usd per share)			$ 249
Capped calls option price			$ 257
Other income, net			4
Additional Paid-In Capital
Option Indexed to Issuer's Equity [Line Items]
Capped call options	[1]		253
Additional Paid-In Capital | Convertible Senior Notes Capped Calls | Senior Notes
Option Indexed to Issuer's Equity [Line Items]
Capped call options			$ 253
[1] For further discussion of the Capped Call Options, see Note 9, Changes in Capital Structure

Changes in Capital Structure _7

Changes in Capital Structure - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2024		Mar. 31, 2024		Sep. 30, 2023
Class of Stock [Line Items]
Preferred stock, dividends declared (in usd per share)	$ 51.25		$ 51.25
Dividends per Series A Preferred Stock (in usd per share)	$ 51.25		$ 51.25		$ 52.96
Series A Preferred Stock dividends	$ 33	[1]	$ 33	[1]	$ 34	[2]
Series A Preferred Stock
Class of Stock [Line Items]
Dividends per Series A Preferred Stock (in usd per share)	$ 51.25		$ 51.25
Series A Preferred Stock dividends	$ 33		$ 33
Series A Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	10.25%		10.25%
[1] Dividends per share of Series A Preferred Stock were $51.25 for each of the periods ended September 15 and March 15, 2024 Dividend per share of Series A Preferred Stock was $52.96

(Loss)_Income Per Share - Basic

(Loss)/Income Per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic (loss)/income per share:
Net (loss)/income	$ (767)	$ 738	$ 511	$ 343	$ 308	$ (1,335)	$ 482	$ (684)
Less: Cumulative dividends attributable to Series A Preferred Stock	17			17			51	38
Net (Loss)/Income Available to Common Stockholders, basic	$ (784)			$ 326			$ 431	$ (722)
Weighted average number of common shares outstanding — basic (in shares)	207,000			230,000			207,000	230,000
(Loss)/Income per weighted average common share — basic (in usd per share)	$ (3.79)			$ 1.42			$ 2.08	$ (3.14)
Diluted (loss)/income per share:
Net (loss)/income	$ (767)	$ 738	$ 511	$ 343	$ 308	$ (1,335)	$ 482	$ (684)
Less: Cumulative dividends attributable to Series A Preferred Stock	17			17			51	38
Net (Loss)/Income Available for Common Stockholders, diluted	$ (784)			$ 326			$ 431	$ (722)
Weighted average number of common shares outstanding — basic (in shares)	207,000			230,000			207,000	230,000
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	0			2,000			3,000	0
Incremental shares attributable to the potential share settlements of the Convertible Senior Notes (if converted method) (in shares)	0			0			3,000	0
Weighted average number of common shares outstanding — diluted (in shares)	207,000			232,000			213,000	230,000
(Loss)/Income per weighted average common share — diluted (in usd per share)	$ (3.79)			$ 1.41			$ 2.02	$ (3.14)

(Loss)_Income Per Share - Outst

(Loss)/Income Per Share - Outstanding Antidilutive Equity Instruments Excluded From Computation of Diluted Loss Per Share (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity compensation plans
Earnings Per Share [Abstract]
Antidilutive securities (in shares)	5	0	0	6
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	5	0	0	6
Potential share settlement of the Convertible Senior Notes
Earnings Per Share [Abstract]
Antidilutive securities (in shares)	3	0	0	0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3	0	0	0

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information
Revenues	$ 7,223	$ 7,946	$ 21,311	$ 22,016
Depreciation and amortization	352	359	1,045	921
Impairment losses	0	0	15	0
Gain (loss) on sale of assets	208		209	202
Equity in earnings of unconsolidated affiliates	6	6	13	16
Loss on debt extinguishment	0	0	260	0
Income/(loss) before income taxes	(1,014)	408	733	(866)
Net income /(loss)	(767)	343	482	(684)
Corporate
Segment Reporting Information
Revenues	0	0	0	0
Depreciation and amortization	11	9	31	27
Impairment losses			0
Gain (loss) on sale of assets	0		0	0
Equity in earnings of unconsolidated affiliates	0	0	0	0
Loss on debt extinguishment			260
Income/(loss) before income taxes	(158)	(140)	(652)	(440)
Net income /(loss)	82	(264)	(932)	(362)
Eliminations
Segment Reporting Information
Revenues	(10)	(5)	(29)	(21)
Depreciation and amortization	0	0	0	0
Impairment losses			0
Gain (loss) on sale of assets	0		0	0
Equity in earnings of unconsolidated affiliates	0	0	0	0
Loss on debt extinguishment			0
Income/(loss) before income taxes	0	0	0	0
Net income /(loss)	0	0	0	0
Texas | Operating Segments
Segment Reporting Information
Revenues	3,301	3,686	8,297	8,235
Depreciation and amortization	81	84	240	257
Impairment losses			0
Gain (loss) on sale of assets	0		(4)	0
Equity in earnings of unconsolidated affiliates	0	0	0	0
Loss on debt extinguishment			0
Income/(loss) before income taxes	(1,056)	463	259	1,532
Net income /(loss)	(1,056)	463	259	1,532
East | Operating Segments
Segment Reporting Information
Revenues	2,600	2,809	8,647	9,488
Depreciation and amortization	39	39	117	122
Impairment losses			0
Gain (loss) on sale of assets	0		0	202
Equity in earnings of unconsolidated affiliates	0	0	0	0
Loss on debt extinguishment			0
Income/(loss) before income taxes	89	314	1,116	(1,188)
Net income /(loss)	88	316	1,116	(1,187)
West/Services/Other | Operating Segments
Segment Reporting Information
Revenues	833	978	2,962	3,244
Depreciation and amortization	23	24	96	73
Impairment losses			15
Gain (loss) on sale of assets	208		213	0
Equity in earnings of unconsolidated affiliates	6	6	13	16
Loss on debt extinguishment			0
Income/(loss) before income taxes	148	(205)	69	(684)
Net income /(loss)	148	(168)	90	(601)
Vivint Smart Home | Operating Segments
Segment Reporting Information
Revenues	499	478	1,434	1,070
Depreciation and amortization	198	203	561	442
Impairment losses			0
Gain (loss) on sale of assets	0		0	0
Equity in earnings of unconsolidated affiliates	0	0	0	0
Loss on debt extinguishment			0
Income/(loss) before income taxes	(37)	(24)	(59)	(86)
Net income /(loss)	$ (29)	$ (4)	$ (51)	$ (66)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Effective Tax Rate
(Loss)/Income before income taxes	$ (1,014)	$ 408	$ 733	$ (866)
Income tax (benefit)/expense	$ (247)	$ 65	$ 251	$ (182)
Effective income tax rate	24.40%	15.90%	34.20%	21%
Uncertain Tax Benefits
Non-current tax liability for uncertain tax benefits	$ 70		$ 70
Unrecognized tax benefits, interest			1
Uncertain tax benefits, penalties and interest accrued	$ 4		$ 4

Related Party Transactions - Sc

Related Party Transactions - Schedule of NRG's Material Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Revenue	$ 7,223	$ 7,946	$ 21,311	$ 22,016
Related Party
Related Party Transaction [Line Items]
Revenue	14	16	42	74
Related Party | Gladstone
Related Party Transaction [Line Items]
Revenue	1	1	2	2
Related Party | Ivanpah
Related Party Transaction [Line Items]
Revenue	12	15	37	70
Related Party | Midway-Sunset
Related Party Transaction [Line Items]
Revenue	$ 1	$ 0	$ 3	$ 2

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions		1 Months Ended
	Oct. 23, 2023 USD ($)	Feb. 28, 2023 USD ($)	Sep. 30, 2024 facility case	May 31, 2024	Dec. 31, 2021 facility	Jun. 30, 2019 facility
Loss Contingencies
Number of facilities | facility			2		2
Sierra Club Et Al V. Midwest Generation LLC
Loss Contingencies
Number of facilities | facility						4
Direct Energy vs. Burk and Dickson
Loss Contingencies
Pending lawsuits | case			2
CPI Security Systems, Inc. v. Vivint Smart Home, Inc.
Loss Contingencies
Damages awarded		$ 50
Punitive damages awarded		$ 140
SB IP Holdings LLC (“Skybell”) v. Vivint Smart Home, Inc.
Loss Contingencies
Damages awarded	$ 45
Partners in STP, CPS and Austin Energy vs. NRG | STP | Settled Litigation
Loss Contingencies
Ownership interest				44%

Regulatory Matters (Details)

Regulatory Matters (Details) - New York State Public Service Commission	Jan. 08, 2024 retailSupplier compliantProduct
Loss Contingencies
Number of company's retail suppliers notified | retailSupplier	8
Minimum
Loss Contingencies
Number of compliant products authorized by regulatory agency	1
Maximum
Loss Contingencies
Number of compliant products authorized by regulatory agency	3

Environmental Matters (Details)

Environmental Matters (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2024 rule	Sep. 30, 2024 USD ($) facility state	Dec. 31, 2021 facility
Commitments and Contingencies Disclosure [Abstract]
New rules for electric generation industry | rule	4
Environmental proceedings, disclosure threshold | $		$ 1
Number of plants | facility		2	2
Number of states challenging the EPA's rule | state		23