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Intangible Assets
9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of September 30, 2024As of December 31, 2023
 Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Amortized Intangible Assets
License agreements$317 $248 $69 $316 $234 $82 
Customer relationships255 228 27 253 221 32 
Other56 50 56 46 10 
Total$628 $526 $102 $625 $501 $124 
Unamortized Intangible Assets
Goodwill$1,109 $1,099 
Trademarks$545 $546 
For the three months ended September 30, 2024 and 2023, amortization expense related to amortizable intangible assets was approximately $7 million and $6 million, respectively. For the nine months ended September 30, 2024 and 2023, amortization expense related to amortizable intangible assets was approximately $22 million and $20 million, respectively.

Based on our amortizable intangible assets at September 30, 2024, we expect amortization expense of approximately $7 million for the remainder of 2024, $23 million for 2025, $22 million for 2026, $16 million for 2027, $9 million for 2028 and $7 million for 2029, excluding effects of currency exchange rates.