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Intangible Assets | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Finite-lived Intangible Assets At September 30, 2024, intangible assets consisted of the following:
| September 30, 2024 |  | December 31, 2023
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Core deposit intangible | $ | 700 |  |  | $ | (201) |  |  | $ | 499 |  |  | $ | 700 |  |  | $ | (113) |  |  | $ | 587 |
Other intangible assets | 51 |  | (31) |  | 20 |  | 56 |  | (18) |  |  | 38
Total other intangible assets | $ | 751 |  |  | $ | (232) |  |  | $ | 519 |  |  | $ | 756 |  |  | $ | (131) |  |  | $ | 625 |
As of September 30, 2024 the weighted average amortization period for core deposit intangibles and other intangible assets is 8.5 years and 2.9 years, respectively. Core deposit intangibles are amortized over the estimated useful life using the sum of years digits amortization method. The estimated amortization expense of core deposit intangibles and other intangible assets for the next five years is as follows:
(in millions) | Amortization Expense
2024 | $ | 32 |
2025 | 106 |
2026 | 93 |
2027 | 80 |
2028 | 68 |
2029 and beyond | 140 |
Total | $ | 519 |

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