Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2025 USD ($) Institutions	Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 977,400	$ 1,039,200
Other liabilities	73	243
FLA Balance For All Master Commitments	222	197
Consolidated Obligation Discount Notes [Member]
Loss Contingencies [Line Items]
Fair Value Option, Principal Balance, Consolidated Obligation Discount Notes	17,504	52,848
Fair Value, Option, Aggregate Differences, Consolidated Obligation Discount Notes	(122)	(499)
Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	179
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	$ 1,070
Number of Housing Authorities For Which the Bank Has Standby Bond Purchase Agreements | Institutions	8
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	$ 1,249	1,024
Commitments to Fund Advances [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	151
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	151	227
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	18,145
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	118
Other liabilities	7	7
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	18,263	20,150
Commitments to Issue Discount Notes
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	3,060
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	3,060	0
Commitments to Issue Bonds [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	1,000
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	1,000	665
standby letters of credit issuance commitments [Domain]
Loss Contingencies [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	0	0
Mortgage Receivable [Member] | Forward Contracts [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	106
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability	$ 106	$ 101