Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 04, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-40115
Entity Registrant Name	COUPANG, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-2810505
Entity Address, Address Line One	Tower 730, 570, Songpa-daero
Entity Address, City or Town	Songpa-gu
Entity Address, Region	Seoul
Entity Address, Country	KR
Entity Address, Postal Zip Code	05510
Country Region	+82
City Area Code	(2)
Local Phone Number	6150-5422
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	CPNG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001834584
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,576,638,517
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		174,802,990