Document and Entity Information
| Document and Entity Information Document | Aug. 17, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 17, 2022 |
| Entity Registrant Name | FEDERAL HOME LOAN BANK OF CHICAGO |
| Entity Central Index Key | 0001331451 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | X1 |
| Entity File Number | 000-51401 |
| Entity Tax Identification Number | 36-6001019 |
| Entity Address, Address Line One | 433 West Van Buren Street, Suite 501S |
| Entity Address, City or Town | Chicago, |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60607 |
| City Area Code | 312 |
| Local Phone Number | 565-5700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |