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Intangible Assets
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of September 30, 2023As of December 31, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
License agreements$301 $226 $75 $290 $217 $73 
Customer relationships245 212 33 247 207 40 
Other49 43 6 48 39 9 
Total$595 $481 $114 $585 $463 $122 
Unamortized Intangible Assets
Goodwill$1,081 $1,070 
Trademarks$544 $544 

For the three months ended September 30, 2023 and 2022, amortization expense related to amortizable intangible assets was approximately $6 million and $9 million, respectively. For the nine months ended September 30, 2023 and 2022, amortization expense related to amortizable intangible assets was approximately $20 million and $35 million, respectively. Based on our amortizable intangible assets at September 30, 2023, we expect amortization expense of approximately $7 million for the remainder of 2023, $25 million for 2024, $19 million for 2025, $17 million for 2026, $14 million for 2027 and $10 million for 2028, excluding effects of currency exchange rates.