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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill, customer relationships and other intangible assets | Goodwill, customer relationships and other intangible assets consisted of the following:
| As of December 31,
| 2022 |  | 2021
| (Dollars in millions)
Goodwill | $ | 9,360 |  |  | 9,360 |
Customer relationships, less accumulated amortization of $— and $5,699 (1) | $ | — |  |  | — |
Other intangible assets, less accumulated amortization of $1,924 and $1,876 | 138 |  |  | 199 |
Total other intangible assets, net | $ | 138 |  |  | 199 |
_______________________________________________________________________________ (1)Customer relationships with a gross carrying value of $5.7 billion became fully amortized during 2021 and were retired during the first quarter of 2022.
Schedule of estimated amortization expense for intangible assets | We estimate that total amortization expense for intangible assets for the years ending December 31, 2023 through 2027 will be as follows:
| (Dollars in millions)
Year ending December 31, |
2023 | $ | 61 |
2024 | 33 |
2025 | 15 |
2026 | 9 |
2027 | 7 |

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