| Cover - USD ($) | 12 Months Ended | ||
| Dec. 31, 2020 | Feb. 28, 2021 | Jun. 30, 2020 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Current Fiscal Year End Date | --12-31 | ||
| Amendment Flag | true | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity File Number | 000-51845 | ||
| Entity Registrant Name | FEDERAL HOME LOAN BANK OF ATLANTA | ||
| 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 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| 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 | ||
| Entity Central Index Key | 0001331465 | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Common Stock, Shares Outstanding | 30,451,499 | ||
| Entity Public Float | $ 0 | ||
| Common Stock, Value, Outstanding | $ 3,681,537,900 | ||
| Entity Tax Identification Number | 56-6000442 | ||
| Entity Incorporation, State or Country Code | X1 | ||
| Document Period End Date | Dec. 31, 2020 | ||
| ICFR Auditor Attestation Flag | true | ||
| Amendment Description | This Amendment No. 1 on Form 10-K/A (Amendment No. 1) is being filed to amend the Federal Home Loan Bank of Atlanta’s (Bank) Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (Original Filing), filed with the U.S. Securities and Exchange Commission on March 4, 2021 (Original Filing Date). The sole purpose of this Amendment No. 1 is to reflect the final delivered and signed Report of Independent Registered Public Accounting Firm (Report) of PricewaterhouseCoopers LLP (PwC). The Report was timely provided by PwC and received by the Bank at the time of the Original Filing. Except as described above, no changes have been made to the Original Filing and this Amendment No. 1 does not modify, amend or update in any way any of the financial or other information contained in the Original Filing. This Amendment No. 1 does not reflect events that may have occurred subsequent to the Original Filing Date.Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment No. 1 also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Amendment No. 1 and this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. |
