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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill, customer relationships and other intangible assets | Goodwill and other intangible assets consisted of the following:
| As of December 31,
| 2024 |  | 2023
| (Dollars in millions)
Goodwill, less accumulated impairment losses of $2,405 and $2,405 | $ | 6,955 |  |  | 6,955 |
Other intangible assets, less accumulated amortization of $1,841 and $1,966 | $ | 84 |  |  | 103 |
Schedule of goodwill | The following table shows the rollforward of goodwill from December 31, 2022 through December 31, 2024:
| (Dollars in millions)
As of December 31, 2022 | $ | 9,360 |
Impairment | (2,405) |
As of December 31, 2023(1) | 6,955 |
As of December 31, 2024(1) | $ | 6,955 |
______________________________________________________________________ (1)Goodwill at December 31, 2024 and December 31, 2023 is net of accumulated impairment losses of $2.4 billion.
Schedule of estimated amortization expense for intangible assets | We estimate that future total amortization expense for finite-lived intangible assets will be as follows:
| (Dollars in millions)
2025 | $ | 27 |
2026 | 17 |
2027 | 13 |
2028 | 10 |
2029 | 6 |
2030 and thereafter | 11 |
Total finite-lived intangible assets future amortization expense | $ | 84 |

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