v3.22.0.1
Cover page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Jan. 28, 2022
Jun. 30, 2021
Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35551    
Entity Registrant Name Meta Platforms, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-1665019    
Entity Address, Address Line One 1601 Willow Road    
Entity Address, City or Town Menlo Park    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94025    
City Area Code 650    
Local Phone Number 543-4800    
Title of 12(b) Security Class A Common Stock, $0.000006 par value    
Trading Symbol FB    
Security Exchange Name NASDAQ    
Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 857
Documents Incorporated by Reference Portions of the registrant's Proxy Statement for the 2022 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2021.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001326801    
Class A      
Entity Information      
Entity Common Stock, Shares Outstanding   2,309,080,018  
Class B      
Entity Information      
Entity Common Stock, Shares Outstanding   412,861,942