Fair Value (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	$ 44	$ 41
Interest-bearing deposits	3,726	4,096
Securities purchased under agreements to resell	17,090	11,950
Federal funds sold	5,930	5,175
Trading Securities	6,303	4,720
Available-for-Sale Securities	27,519	25,331
Held-to-Maturity Securities, Fair Value	452	757
Advances	110,441	100,040
Mortgage loans held for portfolio, net	14,034	10,972
Accrued interest receivable	461	400
Derivative assets, net	80	804
Other Assets, Fair Value Disclosure	50	44
Liabilities
Deposits	(1,147)	(1,314)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure	(173,448)	(152,460)
Financial Instruments Subject to Mandatory Redemption	(30)	(9)
Accrued interest payable	(589)	(717)
Derivative Liability, Net	(3)	(6)
Reported Value Measurement [Member]
Assets
Cash and due from banks	44	41
Interest-bearing deposits	3,726	4,096
Securities purchased under agreements to resell	17,090	11,950
Federal funds sold	5,930	5,175
Trading Securities	6,303	4,720
Available-for-Sale Securities	27,519	25,331
Held-to-maturity securities	447	760
Advances	110,230	99,951
Mortgage loans held for portfolio, net	14,540	11,896
Accrued interest receivable	461	400
Derivative assets, net	80	804
Other Assets, Fair Value Disclosure	50	44
Liabilities
Deposits	(1,147)	(1,314)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure	(173,869)	(153,251)
Financial Instruments Subject to Mandatory Redemption	(30)	(9)
Accrued interest payable	(589)	(717)
Derivative Liability, Net	(3)	(6)
Cash and due from banks	44	41
Trading Securities	6,303	4,720
Held-to-Maturity Securities, Fair Value	452	757
Accrued interest receivable	461	400
Derivative assets, net	80	804
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(160)	602
Financial Instruments Subject to Mandatory Redemption	(30)	(9)	$ (12)	$ (15)
Accrued interest payable	(589)	(717)
Derivative Liability, Net	(3)	(6)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	26	54
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and due from banks	44	41
Interest-bearing deposits	0	0
Securities purchased under agreements to resell	0	0
Federal funds sold	0	0
Trading Securities	0	0
Available-for-Sale Securities	0	0
Held-to-Maturity Securities, Fair Value	0	0
Advances	0	0
Mortgage loans held for portfolio, net	0	0
Accrued interest receivable	0	0
Derivative assets, net	0	0
Other Assets, Fair Value Disclosure	50	44
Liabilities
Deposits	0	0
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure	0	0
Financial Instruments Subject to Mandatory Redemption	(30)	(9)
Accrued interest payable	0	0
Derivative Liability, Net	0	0
Fair Value, Inputs, Level 2 [Member]
Assets
Cash and due from banks	0	0
Interest-bearing deposits	3,726	4,096
Securities purchased under agreements to resell	17,090	11,950
Federal funds sold	5,930	5,175
Trading Securities	6,303	4,720
Available-for-Sale Securities	27,519	25,331
Held-to-Maturity Securities, Fair Value	450	755
Advances	110,441	100,040
Mortgage loans held for portfolio, net	13,996	10,940
Accrued interest receivable	461	400
Derivative assets, net	240	202
Other Assets, Fair Value Disclosure	0	0
Liabilities
Deposits	(1,147)	(1,314)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure	(173,448)	(152,460)
Financial Instruments Subject to Mandatory Redemption	0	0
Accrued interest payable	(589)	(717)
Derivative Liability, Net	(29)	(60)
Fair Value, Inputs, Level 3 [Member]
Assets
Cash and due from banks	0	0
Interest-bearing deposits	0	0
Securities purchased under agreements to resell	0	0
Federal funds sold	0	0
Trading Securities	0	0
Available-for-Sale Securities	0	0
Held-to-Maturity Securities, Fair Value	2	2
Advances	0	0
Mortgage loans held for portfolio, net	38	32
Accrued interest receivable	0	0
Derivative assets, net	0	0
Other Assets, Fair Value Disclosure	0	0
Liabilities
Deposits	0	0
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure	0	0
Financial Instruments Subject to Mandatory Redemption	0	0
Accrued interest payable	0	0
Derivative Liability, Net	0	0
Consolidated Obligation Discount Notes [Member] | Estimate of Fair Value Measurement [Member]
Liabilities
Discount notes	(84,617)	(64,682)
Consolidated Obligation Discount Notes [Member] | Reported Value Measurement [Member]
Liabilities
Discount notes	(84,620)	(64,680)
Consolidated Obligation Discount Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities
Discount notes	0	0
Consolidated Obligation Discount Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities
Discount notes	(84,617)	(64,682)
Consolidated Obligation Discount Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities
Discount notes	0	0
Consolidated Obligation Bonds [Member] | Estimate of Fair Value Measurement [Member]
Liabilities
Debt Instrument, Fair Value Disclosure	(88,831)	(87,778)
Consolidated Obligation Bonds [Member] | Reported Value Measurement [Member]
Liabilities
Debt Instrument, Fair Value Disclosure	(89,249)	(88,571)
Consolidated Obligation Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities
Debt Instrument, Fair Value Disclosure	0	0
Consolidated Obligation Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities
Debt Instrument, Fair Value Disclosure	(88,831)	(87,778)
Consolidated Obligation Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities
Debt Instrument, Fair Value Disclosure	$ 0	$ 0