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Intangible Assets
 12 Months Ended
Dec. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets
 
The cost and accumulated amortization of intangible assets at December 31, 2021 and 2020 were as follows:
 December 31, 2021December 31, 2020
 Carrying
Amount		Accumulated
Amortization		NetCarrying
Amount		Accumulated
Amortization		Net
Patents, trademarks and technology$27 $19 $8 $27 $11 $16 
Other intangibles14 11 3 14 13 1 
Total$41 $30 $11 $41 $24 $17 
 
Amortization expense was $6 million, $4 million and $4 million for the years ended December 31, 2021, 2020 and 2019, respectively. During the fourth quarter of 2021, intangible assets with a net book value of $7 million had a reduction in their remaining useful life as a result of a change in their intended use. The remaining useful life of these assets was reduced from seven years to less than one year.
Our estimated future amortization expense for intangible assets over the next five years is as follows:
Year ending December 31,Amount
2022$9 
20232 
2024— 
2025— 
2026—