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Intangible Assets
 9 Months Ended
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, 2024December 31, 2023
(in millions)Gross Carrying AmountAccumulated AmortizationNet Carrying ValueGross Carrying AmountAccumulated AmortizationNet Carrying Value
Core deposit intangible$700 $(201)$499 $700 $(113)$587 
Other intangible assets51(31)2056(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 
2025106 
202693 
202780 
202868 
2029 and beyond
140 
Total$519