Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 15, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	ZNGA
Entity Registrant Name	Zynga Inc.
Entity Central Index Key	0001439404
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		798,805,953
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		113,648,170
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,517,472