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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The table below presents the changes of goodwill for the years ended December 31, 2023 and 2022 based on the Company's reportable segments.
(in millions)TexasEastWest/Services/OtherVivint Smart HomeTotal
Balance as of January 1, 2022
$716 $853 $226 $— $1,795 
Impairment losses— (130)— — (130)
Asset sales(6)— — — (6)
Foreign currency translation— — (9)— (9)
Balance as of December 31, 2022
$710 $723 $217 $— $1,650 
Goodwill resulted from the acquisition of Vivint— — — 3,494 3,494 
Asset sales(67)(2)— — (69)
Foreign currency translation— — 4 — 4 
Balance as of December 31, 2023
$643 $721 $221 $3,494 $5,079 
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, 2023
Emission
Allowances
Customer and Supply Contracts
Customer
Relationships
Marketing PartnershipsTechnology
Trade
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. See Note 4, Acquisitions and Dispositions, for weighted average life of acquired amortizable intangibles for each intangible asset type
(c)Includes $47 million of intangibles that were amortized

(In millions)     
Year Ended December 31, 2022
Emission
Allowances
Customer and Supply Contracts
Customer
Relationships
Marketing Partnerships
Trade
Names
Other(a)
Total
January 1, 2022$634 $638 $1,679 $284 $683 $229 $4,147 
Purchases26 — — — — 404 430 
Acquisition of businesses(b)
— — 55 — — — 55 
Usage/Retirements(33)— — — — (341)(374)
Write-off of fully amortized balances
(14)— — — — — (14)
Other11 (3)(4)— (4)— — 
December 31, 2022624 635 1,730 284 679 292 4,244 
Less accumulated amortization
(528)(235)(787)(146)(341)(75)(2,112)
Net carrying amount$96 $400 $943 $138 $338 $217 $2,132 
(a)RECs are not subject to amortization and had a carrying value of $186 million
(b)The weighted average life of acquired amortizable intangibles was six years for customer relationships
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)202320222021
Emission allowances$6 $6 $24 
Customer and supply contracts121 141 66 
Customer relationships556 269 327 
Marketing partnerships24 23 24 
Technology230 — — 
Trade names60 47 47 
Other(a)
4 4 7 
Total amortization$1,001 $490 $495 
(a)For the year ended December 31, 2023, 2022 and 2021, other intangibles amortized to depreciation and amortization expense were de minimis, $4 million and $3 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, 2023 for each of the next five years:
(In millions)
Year Ended December 31,
Emission
Allowances
Customer and Supply Contracts
Customer
Relationships
Marketing PartnershipsTechnology
Trade
Names
OtherTotal
2024$17 $73 $478 $24 $227 $54 $3 $876 
202514 50 371 23 176 47 3 684 
20269 52 300 23 130 39 3 556 
20278 30 233 23 89 39 3 425 
20289 13 189 15 9 39 2 276