Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 23, 2020
Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-35551
Entity Registrant Name	Facebook, 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, par value $0.000006
Trading Symbol	FB
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001326801
Current Fiscal Year End Date	--12-31
Class A Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		2,404,282,110
Class B Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		444,533,708