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Network
2419403 - Disclosure - Estimated Fair Values (Roll-forward of Level 3 Assets and Liabilities) (Details)
(http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001331465 (http://www.sec.gov/CIK)
Measurement Frequency [Axis]Fair Value, Measurements, Recurring [Member]
Fair Value, Hierarchy [Axis]Fair Value, Inputs, Level 3 [Member]
Asset Class [Axis]Available-for-Sale Securities, Private Label Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Reconciliation of Available-For-Sale Securities Measured at Fair Value
 
 
 
Balance, beginning of year
1,662,000,000  
1,981,000,000  
2,299,000,000  
Included in net impairment losses recognized in earnings
(3,000,000)1
(5,000,000)1
(3,000,000)1
Included in other comprehensive loss
29,000,000 1
(23,000,000)1
(7,000,000)1
Accretion of credit losses in net interest income
53,000,000 1
42,000,000 1
34,000,000 1
Settlements
(396,000,000) 
(333,000,000) 
(342,000,000) 
Balance, end of year
1,345,000,000  
 
1,662,000,000  
 
1,981,000,000  
 
1: Related to available-for-sale securities held at year end.