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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
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,
| 2023 |  | 2022
| (Dollars in millions)
Goodwill(1) | $ | 6,955 |  |  | $ | 9,360 |
Other intangible assets, less accumulated amortization of $1,966 and $1,924 | $ | 103 |  |  | $ | 138 |
______________________________________________________________________ (1)We recorded a cumulative non-cash, non-tax-deductible goodwill impairment charge of $2.4 billion during the year ended December 31, 2023.
Schedule of Goodwill | The following table shows the rollforward of goodwill from December 31, 2021 through December 31, 2023:
| (Dollars in millions)
As of December 31, 2021 | $ | 9,360 |
As of December 31, 2022 | 9,360 |
Impairment | (2,405) |
As of December 31, 2023(1) | $ | 6,955 |
______________________________________________________________________ (1)Goodwill at December 31, 2023 is net of accumulated impairment losses of $2.4 billion.
Schedule of estimated amortization expense for intangible assets | We estimate that total amortization expense for intangible assets for the years ending December 31, 2024 through 2028 will be as follows:
| (Dollars in millions)
Year ending December 31, |
2024 | $ | 44 |
2025 | 16 |
2026 | 10 |
2027 | 7 |
2028 | 5 |

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