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Intangible Assets
3 Months Ended
Mar. 31, 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 three months ended March 31, 2023.

As a result of the Signature Transaction, the Company recorded $462 million of core deposit intangible and other intangible assets that are amortizable.

At March 31, 2023, intangible assets consisted of the following:

March 31, 2023December 31, 2022
(in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying ValueGross Carrying AmountAccumulated AmortizationNet Carrying Value
Core deposit intangible$700 $(17)$683 $250 $(4)$246 
Other intangible assets56(5)5142(1)41
Total other intangible assets$756 $(22)$734 $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$88 
2024108 
202588 
202679 
202771 
Total$434