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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The following table presents the changes in the carrying amount of goodwill (in millions):
 Optical CommunicationsDisplay TechnologiesSpecialty MaterialsLife SciencesHemlock and Emerging Growth BusinessesTotal
Balance as of December 31, 2022$905 $121 $151 $606 $611 $2,394 
Foreign currency translation adjustment and other(1)(2)1 (12)(14)
Balance as of December 31, 2023$904 $119 $151 $607 $599 $2,380 
Acquired goodwill 11  11 
Foreign currency translation adjustment and other(14)(9)(14)(1)10 (28)
Balance as of December 31, 2024$890 $121 $137 $606 $609 $2,363 
As of December 31, 2024 and 2023, Corning’s gross goodwill balance was $8.9 billion and accumulated impairment losses were $6.5 billion. Accumulated impairment losses were generated primarily through goodwill impairments related to the Optical Communications segment.

Other Intangible Assets, Net
Other intangible assets, net consisted of the following (in millions):
 December 31,
 20242023
 GrossAccumulated amortizationNetGrossAccumulated amortizationNet
Amortized intangible assets:
Patents, trademarks & trade names$407 $266 $141 $493 $318 $175 
Customer lists and other (1)
1,3917806111,464734730
Other intangible assets, net$1,798 $1,046 $752 $1,957 $1,052 $905 
(1)Other consists of intangible assets related to developed technologies and intellectual know-how.
Corning’s amortized intangible assets are primarily related to Optical Communications, Life Sciences and certain businesses within Hemlock and Emerging Growth Businesses. The net carrying amount of intangible assets decreased during the year, primarily driven by amortization of $121 million.
Annual amortization expense is expected to be approximately $118 million, $98 million, $95 million, $88 million and $69 million for years 2025 through 2029, respectively.