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Intangible Assets | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Goodwill is presumed to have an indefinite useful life and is tested for impairment at the reporting unit level, at least once a year. There was no change in goodwill during the nine months ended September 30, 2023. As a result of the Signature Transaction, the Company recorded $464 million of core deposit intangible and other intangible assets that are amortizable. At September 30, 2023, intangible assets consisted of the following:
| September 30, 2023 |  | December 31, 2022
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangible | $ | 700 |  |  | $ | (81) |  |  | $ | 619 |  |  | $ | 250 |  |  | $ | (4) |  |  | $ | 246 |
Other intangible assets | 56 |  | (14) |  | 42 |  | 42 |  | (1) |  |  | 41
Total other intangible assets | $ | 756 |  |  | $ | (95) |  |  | $ | 661 |  |  | $ | 292 |  |  | $ | (5) |  |  | $ | 287 |
The estimated amortization expense of CDI and other intangible assets for the next five years is as follows:
(in millions) | Amortization Expense
2023 | $ | 36 |
2024 | 133 |
2025 | 107 |
2026 | 94 |
2027 | 81 |
Total | $ | 451 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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