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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents the changes in goodwill for the years ended December 31, 2024 and 2023 based on the Company's reportable segments:
(in millions)TexasEastWest/Services/OtherVivint Smart HomeTotal
Balance as of January 1, 2023
$710 $723 $217 $— $1,650 
Goodwill resulted from the acquisition of Vivint— — — 3,494 3,494 
Asset sales(67)(2)— — (69)
Foreign currency translation adjustments— — 4 — 4 
Balance as of December 31, 2023
$643 $721 $221 $3,494 $5,079 
Impairment— — (15)— (15)
Sale of Airtron— — (43)— (43)
Foreign currency translation adjustments— — (10)— (10)
Balance as of December 31, 2024
$643 $721 $153 $3,494 $5,011 
Summary of the Components of Intangible Assets Subject to Amortization
The following tables summarize the components of NRG's intangible assets:
(In millions)     
Year Ended December 31, 2024Emission
Allowances		Customer and Supply ContractsCustomer
Relationships		Marketing PartnershipsTechnologyTrade
Names
Other(a)
Total
January 1, 2024$628 $609 $3,464 $295 $860 $841 $224 $6,921 
Purchases22 — — — — — 497 519 
Acquisition of businesses(b)
— — 35 — — — — 35 
Usage/Sales/Retirements/Transfers(19)— — — — — (461)(480)
Write-off of fully amortized balances— — (146)— — (11)— (157)
Sale of Airtron(c)
— — (255)— — (24)— (279)
Other(6)(3)(5)(1)1 (5)— (19)
December 31, 2024625 606 3,093 294 861 801 260 6,540 
Less accumulated amortization
(538)(399)(1,555)(193)(457)(443)(47)(3,632)
Net carrying amount$87 $207 $1,538 $101 $404 $358 $213 $2,908 
(a)RECs are not subject to amortization and had a carrying value of $213 million
(b)The weighted average amortization period for total amortizable intangible assets is approximately 5 years
(c)Includes $81 million of intangibles that were amortized

(In millions)     
Year Ended December 31, 2023Emission
Allowances		Customer and Supply ContractsCustomer
Relationships		Marketing PartnershipsTechnologyTrade
Names
Other(a)
Total
January 1, 2023$624 $635 $1,730 $284 $— $679 $292 $4,244 
Purchases10 — — — — — 465 475 
Acquisition of businesses(b)
— — 1,773 10 860 160 — 2,803 
Usage/Sales/Retirements— — — — — — (474)(474)
Write-off of fully amortized balances(1)(28)(43)— — — — (72)
Sale of STP(c)
— — — — — — (59)(59)
Other(5)2 4 1 — 2 — 4 
December 31, 2023628 609 3,464 295 860 841 224 6,921 
Less accumulated amortization
(533)(328)(1,300)(170)(230)(401)(32)(2,994)
Net carrying amount$95 $281 $2,164 $125 $630 $440 $192 $3,927 
(a)RECs are not subject to amortization and had a carrying value of $177 million
(b)The weighted average amortization period for total amortizable intangible assets is approximately 10 years
(c)Includes $47 million of intangibles that were amortized
Schedule of Amortization and Retirements of Intangible Expense
The following table presents NRG's amortization of intangible assets for each of the past three years:
Years Ended December 31,
(In millions)202420232022
Emission allowances$5 $6 $6 
Customer and supply contracts71 121 141 
Customer relationships476 556 269 
Marketing partnerships23 24 23 
Technology227 230 — 
Trade names59 60 47 
Other(a)
15 4 4 
Total amortization$876 $1,001 $490 
(a)For the year ended December 31, 2024, 2023 and 2022, other intangibles amortized to depreciation and amortization expense were $15 million, de minimis and $4 million, respectively
Schedule of Estimated Amortization of Intangible Assets for Next Five Years
The following table presents estimated amortization of NRG's intangible assets as of December 31, 2024 for each of the next five years:
(In millions)
Year Ended December 31,Emission
Allowances		Customer and Supply ContractsCustomer
Relationships		Marketing PartnershipsTechnologyTrade
Names		Total
2025$15 $50 $361 $23 $176 $45 $670 
202616 52 289 23 130 37 547 
202719 30 220 23 89 37 418 
202820 12 177 15 9 37 270 
202912 13 137 5 — 37 204