Fair Value (Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	$ 6,067	$ 6,303
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	(181)	(160)
Derivative assets, net	88	80
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset	45	26
Derivative liabilities, net	(7)	(3)
Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Derivative assets, net	0	0
Other assets	54	50
Derivative liabilities, net	0	0
Mortgage loans held for portfolio, net	0	0
Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	6,067	6,303
Debt Securities, Available-for-sale	28,775	27,519
Derivative assets, net	269	240
Other assets	0	0
Derivative liabilities, net	(52)	(29)
Mortgage loans held for portfolio, net	14,864	13,996
Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Derivative assets, net	0	0
Other assets	0	0
Derivative liabilities, net	0	0
Mortgage loans held for portfolio, net	45	38
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	(181)	(160)
Derivative assets, net	88	80
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset	45	26
Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Derivative assets, net	0	0
Other assets	54	50
Total recurring assets	54	50
Derivative liabilities, net	0	0
Total recurring liabilities	0	0
Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	6,067	6,303
Debt Securities, Available-for-sale	28,775	27,519
Derivative assets, net	269	240
Other assets	0	0
Total recurring assets	35,111	34,062
Derivative liabilities, net	(52)	(29)
Total recurring liabilities	(4,807)	(17,411)
Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Derivative assets, net	0	0
Other assets	0	0
Total recurring assets	0	0
Derivative liabilities, net	0	0
Total recurring liabilities	0	0
Fair Value, Nonrecurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets	0	0
Mortgage loans held for portfolio, net	0	0
Fair Value, Nonrecurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets	0	0
Mortgage loans held for portfolio, net	0	0
Fair Value, Nonrecurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets	4	6
Mortgage loans held for portfolio, net	4	6
Interest Rate Swap [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	(181)	(160)
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset	45	26
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net	0	0
Derivative liabilities, net	0	0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net	269	240
Derivative liabilities, net	(52)	(29)
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net	0	0
Derivative liabilities, net	0	0
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	6,067	6,303
Debt Securities, Available-for-sale	28,775	27,519
Derivative assets, net	88	80
Other assets	54	50
Derivative liabilities, net	(7)	(3)
Mortgage loans held for portfolio, net	14,909	14,034
Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	6,067	6,303
Debt Securities, Available-for-sale	28,775	27,519
Other assets	54	50
Total recurring assets	34,984	33,952
Derivative liabilities, net	(7)	(3)
Total recurring liabilities	(4,762)	(17,385)
Fair Value [Member] \| Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets	4	6
Mortgage loans held for portfolio, net	4	6
Fair Value [Member] \| Interest Rate Swap [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net	88	80
Derivative liabilities, net	(7)	(3)
Consolidated Obligation Discount Notes [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	0	0
Consolidated Obligation Discount Notes [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	97,318	84,617
Consolidated Obligation Discount Notes [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	0	0
Consolidated Obligation Discount Notes [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	4,800	17,400
Consolidated Obligation Discount Notes [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	0	0
Consolidated Obligation Discount Notes [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	4,755	17,382
Consolidated Obligation Discount Notes [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	0	0
Consolidated Obligation Discount Notes [Member] \| Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	97,318	84,617
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	5,874	6,104
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	5,874	6,104
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
US Treasury Securities [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	5,874	6,104
U.S. obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	54	57
U.S. obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
U.S. obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	54	57
Debt Securities, Available-for-sale	4	14
U.S. obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
U.S. obligations [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	54	57
Debt Securities, Available-for-sale	4	14
GSE obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	46	48
GSE obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
GSE obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	46	48
Debt Securities, Available-for-sale	304	310
GSE obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
GSE obligations [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	46	48
Debt Securities, Available-for-sale	304	310
State or local housing agency obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
State or local housing agency obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	454	370
State or local housing agency obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
State or local housing agency obligations [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	454	370
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	93	94
Other [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Other [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	93	94
Debt Securities, Available-for-sale	19	19
Other [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	0	0
Debt Securities, Available-for-sale	0	0
Other [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged)	93	94
Debt Securities, Available-for-sale	19	19
U.S. obligations MBS [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
U.S. obligations MBS [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	6,807	5,707
U.S. obligations MBS [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
U.S. obligations MBS [Member] \| Single Family [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	6,807	5,707
Mortgage-backed securities, GSE [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Mortgage-backed securities, GSE [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	200	217
Mortgage-backed securities, GSE [Member] \| Single Family [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Mortgage-backed securities, GSE [Member] \| Single Family [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	200	217
Mortgage-backed securities, GSE [Member] \| Multifamily [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Mortgage-backed securities, GSE [Member] \| Multifamily [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	20,987	20,882
Mortgage-backed securities, GSE [Member] \| Multifamily [Member] \| Fair Value, Recurring [Member] \| Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Mortgage-backed securities, GSE [Member] \| Multifamily [Member] \| Fair Value [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	20,987	20,882
Fair Value Option Election \| Consolidated Obligation Discount Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	(4,755)	(17,382)
Fair Value Option Election \| Consolidated Obligation Discount Notes [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes	$ (4,755)	$ (17,382)

Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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