Cover page - shares	9 Months Ended
	Sep. 30, 2023	Nov. 03, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-40465
Entity Registrant Name	Marqeta, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-4306690
Entity Address, Address Line One	180 Grand Avenue
Entity Address, Address Line Two	6th Floor
Entity Address, City or Town	Oakland
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94612
City Area Code	877
Local Phone Number	962-7738
Title of 12(b) Security	Class A common stock, $0.0001 par value per share
Trading Symbol	MQ
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
Entity Central Index Key	0001522540
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Amendment Flag	false
Document Fiscal Period Focus	Q3
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		467,456,540
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		54,394,645