v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 22, 2019
Entity Information    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
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 Small Business false  
Entity Emerging Growth Company false  
Class A Common Stock    
Entity Information    
Entity Common Stock, Shares Outstanding   2,402,542,856
Class B Common Stock    
Entity Information    
Entity Common Stock, Shares Outstanding   451,945,880