v3.22.0.1
Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill balances are presented below (in millions):
Carrying Amount
Balance as of December 31, 2019$157 
Goodwill acquired74 
Foreign currency translation adjustments10 
Balance as of December 31, 2020$241 
Goodwill acquired538 
Foreign currency translation adjustments(2)
Balance as of December 31, 2021$777 
Intangible assets consist of the following (in millions):
 December 31, 2021December 31, 2020
Developed technology$415 $226 
Patents69 65 
Other14 3 
Intangible assets, gross$498 $294 
Less: accumulated amortization(211)(141)
Intangible assets, net$287 $153 
The weighted-average useful life for the developed technology acquired during each of the years ended December 31, 2021 and 2020 was approximately five years. Amortization expense for intangible assets was approximately $76 million, $46 million and $35 million for the years ended December 31, 2021, 2020 and 2019, respectively.

The following table presents the estimated future amortization expense related to intangible assets held at December 31, 2021 (in millions):
Years Ending December 31,
2022$80 
202374 
202467 
202545 
202615 
Thereafter6 
Total future amortization expense$287