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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 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, 2020$241 
Goodwill acquired533 
Foreign currency translation adjustments(4)
Balance as of September 30, 2021$770 

Intangible assets consist of the following (in millions):
 September 30, 2021December 31, 2020
Developed technology$414 $226 
Patents62 65 
Other15 3 
Intangible assets, gross491 294 
Less: accumulated amortization(189)(141)
Intangible assets, net$302 $153 

The weighted-average useful life for the developed technology acquired during each of the nine months ended September 30, 2021 and September 30, 2020 was approximately five years.

Amortization expense for intangible assets for the three months ended September 30, 2021 and 2020 was $20 million and $10 million, respectively, and for the nine months ended September 30, 2021 and 2020 was $53 million and $35 million, respectively.

The following table presents the estimated future amortization expense related to intangible assets held at September 30, 2021 (in millions):
Years Ending December 31,
Remainder of 2021$21 
202280 
202373 
202466 
202545 
Thereafter17 
Total future amortization expense$302