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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2022 |  | December 31, 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 $1,877 and $1,876 | 186 |  |  | 199 |
Total other intangible assets, net | $ | 186 |  |  | 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 Finite-Lived Intangible Assets, Future Amortization Expense | We estimate that total amortization expense for intangible assets for the years ending December 31, 2022 through 2026 will be as follows:
| (Dollars in millions)
2022 (remaining nine months) | $ | 56 |
2023 | 59 |
2024 | 30 |
2025 | 12 |
2026 | 7 |

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