| Document and Entity Information | May 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 12, 2021 |
| Entity Registrant Name | ContextLogic Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39775 |
| Entity Tax Identification Number | 27-2930953 |
| Entity Address, Address Line One | 1 Sansome Street |
| Entity Address, Address Line Two | 40th Floor |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94104 |
| City Area Code | 415 |
| Local Phone Number | 432-7323 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001822250 |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | WISH |
| Security Exchange Name | NASDAQ |
