Fair Value Fair Value Estimates (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	$ 2,744	$ 1,769
Available-for-sale	24,254	23,084
Held-to-maturity, at fair value	1,163	1,547
Advances	129	135
Derivative assets	65	82
Other assets	76	68
Netting & Cash Collateral	(1,114)	(1,000)
Assets	122,820	118,384
Consolidated obligation discount notes	0	(3,591)
Consolidated obligation bonds	(80)	(1,107)
Derivative liabilities	(5)	(20)
Derivative liabilities netting adjustments and cash collateral	1,937	2,065
Liabilities	(114,316)	(110,244)
Net Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks and interest-bearing deposits	2,595	2,604
Federal funds sold and securities purchased under agreements to resell	17,437	11,868
Held-to-maturity, at fair value	1,171	1,552
Advances	60,579	65,171
MPF Loans held in portfolio, net	12,374	11,405
Other assets	409	426
Financial assets	121,840	118,169
Other nonfinancial assets	980	215
Assets	122,820	118,384
Deposits	(802)	(628)
Consolidated obligation discount notes	(42,852)	(24,518)
Consolidated obligation bonds	(69,413)	(79,282)
Mandatorily redeemable capital stock	(83)	(83)
Other liabilities	(543)	(591)
Financial liabilities	(113,778)	(109,820)
Other nonfinancial liabilities	(538)	(424)
Liabilities	(114,316)	(110,244)
Net Carrying Amount | Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,744	1,769
Available-for-sale	24,254	23,084
Advances	129	135
Derivative assets	65	82
Other assets	76	68
Consolidated obligation discount notes		(3,591)
Consolidated obligation bonds	(80)	(1,107)
Derivative liabilities	(5)	(20)
Net Carrying Amount | Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	7	5
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks and interest-bearing deposits	2,595	2,604
Federal funds sold and securities purchased under agreements to resell	17,437	11,868
Held-to-maturity, at fair value	1,163	1,547
Advances	60,690	65,208
MPF Loans held in portfolio, net	11,124	10,427
Other assets	409	426
Financial assets	120,693	117,223
Deposits	(802)	(628)
Consolidated obligation discount notes	(42,836)	(24,507)
Consolidated obligation bonds	(68,187)	(77,953)
Mandatorily redeemable capital stock	(83)	(83)
Other liabilities	(543)	(591)
Financial liabilities	(112,536)	(108,480)
Fair Value | Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,744	1,769
Available-for-sale	24,254	23,084
Advances	129	135
Derivative assets	65	82
Other assets	76	68
Consolidated obligation discount notes		(3,591)
Consolidated obligation bonds	(80)	(1,107)
Derivative liabilities	(5)	(20)
Fair Value | Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	7	5
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks and interest-bearing deposits	2,595	2,604
Financial assets	2,595	2,604
Mandatorily redeemable capital stock	(83)	(83)
Financial liabilities	(83)	(83)
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal funds sold and securities purchased under agreements to resell	17,437	11,868
Held-to-maturity, at fair value	1,158	1,541
Advances	60,690	65,208
MPF Loans held in portfolio, net	11,116	10,422
Other assets	409	426
Financial assets	119,192	115,603
Deposits	(802)	(628)
Consolidated obligation discount notes	(42,836)	(24,507)
Consolidated obligation bonds	(68,187)	(77,953)
Other liabilities	(543)	(591)
Financial liabilities	(114,390)	(110,462)
Level 2 | Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,744	1,769
Available-for-sale	24,254	23,084
Advances	129	135
Derivative assets	1,179	1,082
Other assets	76	68
Consolidated obligation discount notes		(3,591)
Consolidated obligation bonds	(80)	(1,107)
Derivative liabilities	(1,942)	(2,085)
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity, at fair value	5	6
MPF Loans held in portfolio, net	8	5
Financial assets	20	16
Financial liabilities	0	0
Level 3 | Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	7	5
Netting & Cash Collateral | Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Netting & Cash Collateral	(1,114)	(1,000)
Financial assets	(1,114)	(1,000)
Derivative liabilities netting adjustments and cash collateral	1,937	2,065
Financial liabilities	$ 1,937	$ 2,065