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Revenue Recognition
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE RECOGNITION REVENUE RECOGNITION
We sell cybersecurity solutions to a variety of organizations, such as enterprises, communication service providers, government organizations and small to medium-sized enterprises. Our revenue consists of product and service revenue. Product revenue is generated by our FortiGate network security products, our Fortinet Security Fabric cybersecurity mesh platform products and other products. Service revenue relates to sales of our security subscription services, which mainly consists of our FortiGuard security solutions, as well as our FortiCare technical support services and other services.

Disaggregation of Revenue

The following table presents our revenue disaggregated by major product and service lines (in millions):
Year Ended December 31,
202120202019
Product$1,255.0 $916.4 $788.5 
Service:
Security subscription1,125.0 918.7 750.8 
Technical support and other962.2 759.3 623.7 
Total service revenue2,087.2 1,678.0 1,374.5 
Total revenue$3,342.2 $2,594.4 $2,163.0 

Deferred Revenue

Our deferred revenue consists of amounts that have been invoiced but have not been recognized as revenue as of period end. During 2021, we recognized $1.37 billion in revenue that was included in the deferred revenue balance as of December 31, 2020. During 2020, we recognized $1.15 billion in revenue that was included in the deferred revenue balance as of December 31, 2019.

Transaction Price Allocated to the Remaining Performance Obligations

As of December 31, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $3.45 billion, which was substantially comprised of deferred security subscription and technical support services. We expect to recognize approximately $1.78 billion as revenue over the next 12 months and the remainder thereafter.