| Document and Entity Information Document | Jul. 29, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 28, 2021 |
| Entity Registrant Name | FEDERAL HOME LOAN BANK OF ATLANTA |
| Entity Central Index Key | 0001331465 |
| Entity Incorporation, State or Country Code | X1 |
| Amendment Flag | false |
| Entity File Number | 001-51845 |
| Entity Tax Identification Number | 56-6000442 |
| Entity Address, Address Line One | 1475 Peachtree Street, NE |
| Entity Address, City or Town | Atlanta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30309 |
| City Area Code | 404 |
| Local Phone Number | 888-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
