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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 |  | December 31, 2019
| (Dollars in millions)
Goodwill | $ | 9,360 |  |  | 9,360 |
Customer relationships, less accumulated amortization of $5,330 and $5,231 | $ | 369 |  |  | 468 |
Other intangible assets, less accumulated amortization of $1,802 and $1,780 | $ | 313 |  |  | 311 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | We estimate that total amortization expense for intangible assets for the years ending December 31, 2020 through 2024 will be as follows:
| (Dollars in millions)
2020 (remaining nine months) | $ | 359 |
2021 | 154 |
2022 | 52 |
2023 | 42 |
2024 | 33 |

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