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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2025
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, 2025 |  | December 31, 2024
| (Dollars in millions)
Goodwill | $ | 1,964 |  |  | 1,964 |
Indefinite-lived intangible assets | $ | — |  |  | 9 |
Other intangible assets subject to amortization: |  |  |
Customer relationships, less accumulated amortization of $4,499 and $4,504(1) | 3,048 |  |  | 3,196 |
Capitalized software, less accumulated amortization of $3,776 and $4,067(1) | 1,544 |  |  | 1,529 |
Patents and other, less accumulated amortization of $89 and $86 | 68 |  |  | 72 |
Total other intangible assets, net | $ | 4,660 |  |  | 4,806 |
______________________________________________________________________ (1) Certain customer relationships with a gross carrying value of $161 million and capitalized software with a gross carrying value of $211 million became fully amortized during 2024 and were retired during the first quarter of 2025.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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