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Intangible Assets
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of June 30, 2022As of December 31, 2021
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
License agreements$286 $204 $82 $298 $193 $105 
Customer relationships245 201 44 257 204 53 
Other47 36 11 51 36 15 
Total$578 $441 $137 $606 $433 $173 
Unamortized Intangible Assets
Goodwill$1,066 $1,108 
Trademarks$548 $551 

For the three months ended June 30, 2022 and 2021, amortization expense related to amortizable intangible assets was approximately $10 million and $14 million, respectively. For the six months ended June 30, 2022 and 2021, amortization expense related to amortizable intangible assets was approximately $26 million and $32 million, respectively. Based on our amortizable intangible assets at June 30, 2022, we expect amortization expense of approximately $18 million for the remainder of 2022, $26 million for 2023, $21 million for 2024, $15 million for 2025, $14 million for 2026 and $12 million for 2027, excluding effects of currency exchange rates.