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Goodwill and Intangible Assets
 6 Months Ended
Jun. 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 acquired551 
Foreign currency translation adjustments1 
Balance as of June 30, 2021$793 

Intangible assets consist of the following (in millions):
 June 30, 2021December 31, 2020
Developed technology$403 $226 
Patents62 65 
Other15 3 
Intangible assets, gross480 294 
Less: accumulated amortization(170)(141)
Intangible assets, net$310 $153 

The weighted-average useful life for the developed technology acquired during the six months ended June 30, 2021 and June 30, 2020 was approximately five years, respectively.
Amortization expense for intangible assets for the three months ended June 30, 2021 and 2020 was $16 million and $15 million, respectively, and for the six months ended June 30, 2021 and 2020 was $33 million and $25 million, respectively.

The following table presents the estimated future amortization expense related to intangible assets held at June 30, 2021 (in millions):
Years Ending December 31,
Remainder of 2021$40 
202278 
202371 
202464 
202542 
Thereafter15 
Total future amortization expense$310