| Cover | May 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 12, 2021 |
| Entity Registrant Name | COUPANG, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40115 |
| 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 |
| City Area Code | 2 |
| Local Phone Number | 6150-5422 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | CPNG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001834584 |
| Amendment Flag | false |
