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Intangible Assets
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 As of June 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$276 $170 $106 $280 $151 $129 
Customer relationships264 202 62 268 196 72 
Other53 35 18 54 33 21 
Total$593 $407 $186 $602 $380 $222 
Unamortized Intangible Assets
Goodwill$1,127 $1,137 
Trademarks$553 $552 

For the three months ended June 30, 2021 and 2020, amortization expense related to amortizable intangible assets was approximately $14 million and $16 million, respectively. For the six months ended June 30, 2021 and 2020, amortization expense related to amortizable intangible assets was approximately $32 million and $29 million, respectively. Based on the Company’s amortizable intangible assets at June 30, 2021, the Company expects amortization expense of approximately $26 million for the remainder of 2021, $34 million for 2022, $26 million for 2023, $23 million for 2024, $17 million for 2025 and $16 million for 2026, excluding effects of currency exchange rates.