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Goodwill and Intangible Assets
 3 Months Ended
Mar. 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, 2020$241 
Goodwill acquired126 
Foreign currency translation adjustments(6)
Balance as of March 31, 2021$361 

Intangible assets consist of the following (in millions):
 March 31, 2021December 31, 2020
Developed technology$308 $226 
Patents62 65 
Other5 3 
Intangible assets, gross375 294 
Less: accumulated amortization(154)(141)
Intangible assets, net$221 $153 

The weighted-average useful life for the developed technology acquired during the three months ended March 31, 2021 was approximately five years. Amortization expense for intangible assets for the three months ended March 31, 2021 and 2020 was $17 million and $10 million, respectively.
The following table presents the estimated future amortization expense related to intangible assets held at March 31, 2021 (in millions):
Years Ending December 31,
Remainder of 2021$44 
202255 
202349 
202443 
202523 
Thereafter7 
Total future amortization expense$221