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Intangible Assets
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of September 30, 2021As of December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
License agreements$291 $177 $114 $280 $151 $129 
Customer relationships259 202 57 268 196 72 
Other52 36 16 54 33 21 
Total$602 $415 $187 $602 $380 $222 
Unamortized Intangible Assets
Goodwill$1,114 $1,137 
Trademarks$551 $552 

For the three months ended September 30, 2021 and 2020, amortization expense related to amortizable intangible assets was approximately $13 million and $17 million, respectively. For the nine months ended September 30, 2021 and 2020, amortization expense related to amortizable intangible assets was approximately $45 million and $46 million, respectively. Based on the Company’s amortizable intangible assets at September 30, 2021, the Company expects amortization expense of approximately $16 million for the remainder of 2021, $44 million for 2022, $29 million for 2023, $22 million for 2024, $17 million for 2025 and $15 million for 2026, excluding effects of currency exchange rates.