v3.8.0.1
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2017
Jan. 29, 2018
Jun. 30, 2017
Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol FB    
Entity Registrant Name FACEBOOK INC    
Entity Central Index Key 0001326801    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 372
Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Class A Common Stock      
Entity Information      
Entity Common Stock, Shares Outstanding   2,395,921,635  
Class B Common Stock      
Entity Information      
Entity Common Stock, Shares Outstanding   509,079,123