Name:	fhlba_FederalHomeLoanBankShareholderPercentageofTotalInterestbearingDeposits
Namespace Prefix:	fhlba_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents Federal Home Loan Bank shareholder advances outstanding as a percentage of total Federal Home Loan Banks advances outstanding as of the balance sheet date.

No definition available.

Name:	fhlba_FederalHomeLoanBankShareholderPercentageofTotalParValueAdvancesOutstanding
Namespace Prefix:	fhlba_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents Federal Home Loan Bank shareholder percentage of total regulatory capital stock outstanding.

No definition available.

Name:	fhlba_FederalHomeLoanBankShareholderPercentageofTotalRegulatoryCapitalStockOutstanding
Namespace Prefix:	fhlba_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Members with 10 percent or more of the voting interests of our capital stock outstanding

No definition available.

Name:	fhlba_RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage
Namespace Prefix:	fhlba_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Line items for Schedule of Transactions with Shareholders [Table]

No definition available.

Name:	fhlba_ScheduleofTransactionswithShareholdersLineItems
Namespace Prefix:	fhlba_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Shareholders whose regulatory capital stock holdings exceeded 10 percent of total regulatory capital stock outstanding.

No definition available.

Name:	fhlba_TransactionswithShareholdersDefinitionofShareholderConcentrationRegulatoryCapitalStockPercent
Namespace Prefix:	fhlba_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Par amount of advances made and reported by Federal Home Loan Bank (FHLBank).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Publisher SEC

Name:	us-gaap_FederalHomeLoanBankAdvancesParValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of regulatory capital of Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1G
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1G

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Name:	us-gaap_FederalHomeLoanBankRegulatoryCapitalActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of money in interest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1