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Goodwill and Identifiable Intangible Assets and Liabilities (Tables) | 12 Months Ended
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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 Segment |  | Reporting Unit |  | Carrying Value of Goodwill
Texas |  | Texas Generation |  | $ | 122 |
Retail (a) |  | Retail |  | 2,461 |
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, 2023 |  | December 31, 2022
Identifiable Intangible Asset |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Retail customer relationship |  | $ | 2,088 |  |  | $ | 1,866 |  |  | $ | 222 |  |  | $ | 2,088 |  |  | $ | 1,768 |  |  | $ | 320 |
Software and other technology-related assets |  | 536 |  |  | 315 |  |  | 221 |  |  | 475 |  |  | 258 |  |  | 217 |
Retail and wholesale contracts |  | 233 |  |  | 217 |  |  | 16 |  |  | 233 |  |  | 209 |  |  | 24 |
LTSA |  | 18 |  |  | 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 Liability |  | 2023 |  | 2022
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 Assets |  | Consolidated Statements of Operations |  | Remaining useful lives of identifiable intangible assets at December 31, 2023 (weighted average in years) |  | Year Ended December 31,
|  |  | 2023 |  | 2022 |  | 2021
Retail customer relationship |  | Depreciation and amortization |  | 3 |  | $ | 98 |  |  | $ | 137 |  |  | $ | 197 |
Software and other technology-related assets |  | Depreciation and amortization |  | 4 |  | 58 |  |  | 69 |  |  | 74 |
Retail and wholesale contracts |  | Operating revenues/fuel, purchased power costs and delivery fees |  | 3 |  | 8 |  |  | 7 |  |  | (56) |
Other identifiable intangible assets |  | Fuel, purchased power costs and delivery fees |  | 5 |  | 357 |  |  | 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.
Year |  | Estimated Amortization Expense
2024 |  | $ | 122 |
2025 |  | $ | 95 |
2026 |  | $ | 71 |
2027 |  | $ | 47 |
2028 |  | $ | 31 |

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