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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 | $ | 1,964 |  |  | 1,964 |
Indefinite-lived intangible assets | $ | 9 |  |  | 9 |
Other intangible assets subject to amortization: |  |  |
Customer relationships, less accumulated amortization of $4,047 and $4,248 | 3,656 |  |  | 3,811 |
Capitalized software, less accumulated amortization of $3,981 and $4,045(1) | 1,542 |  |  | 1,564 |
Trade names, patents and other, less accumulated amortization of $75 and $72(1) | 83 |  |  | 86 |
Total other intangible assets, net | $ | 5,290 |  |  | 5,470 |
______________________________________________________________________ (1) Certain customer relationships with a gross carrying value of $352 million and capitalized software with a gross carrying value of $153 million became fully amortized during 2023 and were retired during the three months ended March 31, 2024.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | We estimate that total amortization expense for finite-lived intangible assets for the years ending December 31, 2024 through 2028 will be as provided in the table below.
| (Dollars in millions)
2024 (remaining nine months) | $ | 736 |
2025 | 895 |
2026 | 841 |
2027 | 753 |
2028 | 686 |

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