Segment Reporting (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			2
Net interest income	$ 7,268	$ 7,035	$ 14,291	$ 13,821
Fee and other income	68	70	140	133
Net revenues	7,336	7,105	14,431	13,954
Investment gains (losses), net	(62)	25	(40)	(42)
Fair value gains (losses), net	447	404	927	608
Administrative expenses	(939)	(864)	(1,868)	(1,732)
Benefit (provision) for credit losses	300	1,266	480	1,134
TCCA fees	(859)	(856)	(1,719)	(1,711)
Credit enhancement expense	(405)	(384)	(824)	(725)
Change in expected credit enhancement recoveries	37	(160)	100	(40)
Other expenses, net	(251)	(257)	(450)	(387)
Income before federal income taxes	5,604	6,279	11,037	11,059
Provision for federal income taxes	(1,120)	(1,285)	(2,233)	(2,293)
Net income	4,484	4,994	8,804	8,766
Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	(859)	(856)	(1,719)	(1,711)
Business segments | Single-Family
Segment Reporting Information [Line Items]
Net interest income	6,096	5,917	11,970	11,589
Fee and other income	51	52	106	100
Net revenues	6,147	5,969	12,076	11,689
Investment gains (losses), net	(70)	27	(57)	(44)
Fair value gains (losses), net	454	460	938	626
Administrative expenses	(784)	(718)	(1,561)	(1,438)
Benefit (provision) for credit losses	548	1,418	883	1,465
Credit enhancement expense	(333)	(327)	(686)	(614)
Change in expected credit enhancement recoveries	(47)	(223)	(89)	(128)
Other expenses, net	(218)	(203)	(394)	(319)
Income before federal income taxes	4,838	5,547	9,391	9,526
Provision for federal income taxes	(983)	(1,153)	(1,929)	(2,000)
Net income	3,855	4,394	7,462	7,526
Business segments | Single-Family | Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	(859)	(856)	(1,719)	(1,711)
Business segments | Multifamily
Segment Reporting Information [Line Items]
Net interest income	1,172	1,118	2,321	2,232
Fee and other income	17	18	34	33
Net revenues	1,189	1,136	2,355	2,265
Investment gains (losses), net	8	(2)	17	2
Fair value gains (losses), net	(7)	(56)	(11)	(18)
Administrative expenses	(155)	(146)	(307)	(294)
Benefit (provision) for credit losses	(248)	(152)	(403)	(331)
Credit enhancement expense	(72)	(57)	(138)	(111)
Change in expected credit enhancement recoveries	84	63	189	88
Other expenses, net	(33)	(54)	(56)	(68)
Income before federal income taxes	766	732	1,646	1,533
Provision for federal income taxes	(137)	(132)	(304)	(293)
Net income	629	600	1,342	1,240
Business segments | Multifamily | Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	$ 0	$ 0	$ 0	$ 0