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Intangible Assets
3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of March 31, 2025As of December 31, 2024
 Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Amortized Intangible Assets
License agreements$313 $252 $61 $306 $244 $62 
Customer relationships250 229 21 244 221 23 
Other54 49 52 47 
Total$617 $530 $87 $602 $512 $90 
Unamortized Intangible Assets
Goodwill$1,091 $1,071 
Trademarks$511 $511 

For the three months ended March 31, 2025 and 2024, amortization expense related to amortizable intangible assets was approximately $6 million and $8 million, respectively.
Based on our amortizable intangible assets at March 31, 2025, we expect amortization expense of approximately $16 million for the remainder of 2025, $21 million for 2026, $16 million for 2027, $9 million for 2028, $7 million for 2029 and $7 million for 2030, excluding effects of currency exchange rates.