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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | Goodwill, customer relationships and other intangible assets consisted of the following:
| March 31, 2024 |  | December 31, 2023
| (Dollars in millions)
Goodwill | $ | 6,955 |  |  | 6,955 |
Other intangible assets, less accumulated amortization of $1,958 and $1,966 | $ | 99 |  |  | 103 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | 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)
2024 (remaining nine months) | $ | 25 |
2025 | 26 |
2026 | 15 |
2027 | 11 |
2028 | 8 |

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