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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The changes in the carrying amount of goodwill for the periods presented were as follows:

Amount
Balance as of December 31, 2019
$36 
Acquisitions
— 
Balance as of December 31, 2020
36 
Acquisitions
38 
Balance as of December 31, 2021
$74 

We determined impairment indicators were present as of March 31, 2020 due to the COVID-19 pandemic and evaluated goodwill for impairment. We compared the book value of our reporting unit to the fair value of the equity implied by common stock valuations performed in April 2020, concluding that there was no goodwill impairment.

There were no goodwill impairment losses recognized during the years ended December 31, 2021, 2020 and 2019. We performed our annual quantitative goodwill impairment test as of December 31, 2021 and determined that no adjustment to goodwill was necessary because the reporting unit's fair value significantly exceeded its book value.

Intangible assets, net consisted of the following:
As of December 31, 2021
Technology AssetCustomer AssetsTotal
Gross carrying amount$22 $$26 
Accumulated amortization(8)(2)(10)
Intangible assets, net$14 $$16 

As of December 31, 2020
Technology AssetCustomer AssetsTotal
Gross carrying amount$$$12 
Accumulated amortization(4)(1)(5)
Intangible assets, net$$$

The total estimated future amortization of intangible assets as of December 31, 2021 was as follows:
Year ended December 31,Amount
2022$
2023
2024
2025
2026
Thereafter
$16