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Goodwill and Identifiable Intangible Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
As of both December 31, 2023 and 2022, the carrying value of goodwill totaled $2.583 billion as there were no additions or impairments in the years then ended. The carrying value of goodwill as of each date consists of the following:

Reportable SegmentReporting UnitCarrying Value of Goodwill
TexasTexas Generation$122 
Retail (a)Retail2,461 
Total$2,583 
____________
(a)$1.944 billion of goodwill is deductible for tax purposes over 15 years on a straight-line basis.
Schedule of Finite-Lived Intangible Assets
Identifiable intangible assets are comprised of the following:
December 31, 2023December 31, 2022
Identifiable Intangible AssetGross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Retail customer relationship$2,088 $1,866 $222 $2,088 $1,768 $320 
Software and other technology-related assets536 315 221 475 258 217 
Retail and wholesale contracts233 217 16 233 209 24 
LTSA18 5 13 18 4 14 
Other identifiable intangible assets (a)62 11 51 50 8 42 
Total identifiable intangible assets subject to amortization$2,937 $2,414 523 $2,864 $2,247 617 
Retail trade names (not subject to amortization)1,341 1,341 
Total identifiable intangible assets$1,864 $1,958 
____________
(a)Includes mining development costs and environmental allowances (emissions allowances and renewable energy certificates).
Schedule of Finite-Lived Intangible Liabilities
Identifiable intangible liabilities are comprised of the following:
Year Ended December 31,
Identifiable Intangible Liability20232022
LTSA
$122 $128 
Fuel and transportation purchase contracts
9 9 
Other identifiable intangible liabilities— 3 
Total identifiable intangible liabilities$131 $140 
Schedule of Amortization Expense Related to Intangible Assets Including Income Statement
Expense related to finite-lived identifiable intangible assets (including the classification in the consolidated statements of operations) consisted of:
Identifiable Intangible AssetsConsolidated Statements of OperationsRemaining useful lives of identifiable intangible assets at December 31,
2023 (weighted average in years)		Year Ended December 31,
202320222021
Retail customer relationshipDepreciation and amortization3$98 $137 $197 
Software and other technology-related assetsDepreciation and amortization458 69 74 
Retail and wholesale contractsOperating revenues/fuel, purchased power costs and delivery fees38 7 (56)
Other identifiable intangible assetsFuel, purchased power costs and delivery fees5357 391 279 
Total intangible asset expense (a)$521 $604 $494 
____________
(a)Amounts recorded in depreciation and amortization totaled $158 million, $208 million and $275 million for the years ended December 31, 2023, 2022 and 2021, respectively. Amounts include all expenses associated with environmental allowances including expenses accrued to comply with emissions allowance programs and renewable portfolio standards which are presented in fuel, purchased power costs and delivery fees on our consolidated statements of operations. Emissions allowance obligations are accrued as associated electricity is generated and renewable energy certificate obligations are accrued as retail electricity delivery occurs.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
As of December 31, 2023, the estimated aggregate amortization expense of identifiable intangible assets for each of the next five fiscal years is as shown below.
YearEstimated Amortization Expense
2024$122 
2025$95 
2026$71 
2027$47 
2028$31