Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 02, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	MNTV
Entity Registrant Name	Momentive Global Inc.
Entity Central Index Key	0001739936
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		148,931,604
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-38664
Entity Tax Identification Number	80-0765058
Entity Address, Address Line One	One Curiosity Way
Entity Address, City or Town	San Mateo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94403
City Area Code	650
Local Phone Number	543-8400
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Document Quarterly Report	true
Document Transition Report	false
Security Exchange Name	NASDAQ