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Revenue
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Revenue disaggregated by revenue source and by segment consists of the following (in millions). For comparative purposes, amounts in prior periods have been recast:
Year Ended December 31, 
202120202019
Advertising$114,934 $84,169 $69,655 
Other revenue721 657 541 
Family of Apps$115,655 $84,826 $70,196 
Reality Labs2,274 1,139 501 
Total revenue$117,929 $85,965 $70,697 
Revenue disaggregated by geography, based on the addresses of our customers, consists of the following (in millions):
 Year Ended December 31, 
 202120202019
United States and Canada(1)
$51,541 $38,433 $32,206 
Europe(2)
29,057 20,349 16,826 
Asia-Pacific26,739 19,848 15,406 
Rest of World(2)
10,592 7,335 6,259 
Total revenue$117,929 $85,965 $70,697 
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(1)United States revenue was $48.38 billion, $36.25 billion, and $30.23 billion for the years ended December 31, 2021, 2020, and 2019, respectively.
(2)Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.

Our total deferred revenue was $596 million and $371 million as of December 31, 2021 and 2020, respectively. As of December 31, 2021, we expect $517 million of our deferred revenue to be realized in less than a year.