Segment Reporting (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			2
Net interest income	$ 7,035	$ 7,808	$ 13,821	$ 15,207
Fee and other income	70	81	133	164
Net revenues	7,105	7,889	13,954	15,371
Investment gains (losses), net	25	(49)	(42)	(151)
Fair value gains, net	404	529	608	1,009
Administrative expenses	(864)	(795)	(1,732)	(1,603)
Benefit (provision) for credit losses	1,266	(218)	1,134	(458)
TCCA fees	(856)	(841)	(1,711)	(1,665)
Credit enhancement expense	(384)	(332)	(725)	(610)
Change in expected credit enhancement recoveries	(160)	(47)	(40)	13
Other expenses, net	(257)	(261)	(387)	(458)
Income before federal income taxes	6,279	5,875	11,059	11,448
Provision for federal income taxes	(1,285)	(1,222)	(2,293)	(2,387)
Net income	4,994	4,653	8,766	9,061
US Treasury
Segment Reporting Information [Line Items]
TCCA fees	(856)	(841)	(1,711)	(1,665)
Business segments | Single-Family
Segment Reporting Information [Line Items]
Net interest income	5,917	6,573	11,589	12,828
Fee and other income	52	60	100	121
Net revenues	5,969	6,633	11,689	12,949
Investment gains (losses), net	27	(27)	(44)	(93)
Fair value gains, net	460	543	626	1,070
Administrative expenses	(718)	(671)	(1,438)	(1,354)
Benefit (provision) for credit losses	1,418	(206)	1,465	(476)
Credit enhancement expense	(327)	(270)	(614)	(480)
Change in expected credit enhancement recoveries	(223)	(43)	(128)	26
Other expenses, net	(203)	(224)	(319)	(388)
Income before federal income taxes	5,547	4,894	9,526	9,589
Provision for federal income taxes	(1,153)	(1,008)	(2,000)	(1,994)
Net income	4,394	3,886	7,526	7,595
Business segments | Single-Family | US Treasury
Segment Reporting Information [Line Items]
TCCA fees	(856)	(841)	(1,711)	(1,665)
Business segments | Multifamily
Segment Reporting Information [Line Items]
Net interest income	1,118	1,235	2,232	2,379
Fee and other income	18	21	33	43
Net revenues	1,136	1,256	2,265	2,422
Investment gains (losses), net	(2)	(22)	2	(58)
Fair value gains, net	(56)	(14)	(18)	(61)
Administrative expenses	(146)	(124)	(294)	(249)
Benefit (provision) for credit losses	(152)	(12)	(331)	18
Credit enhancement expense	(57)	(62)	(111)	(130)
Change in expected credit enhancement recoveries	63	(4)	88	(13)
Other expenses, net	(54)	(37)	(68)	(70)
Income before federal income taxes	732	981	1,533	1,859
Provision for federal income taxes	(132)	(214)	(293)	(393)
Net income	600	767	1,240	1,466
Business segments | Multifamily | US Treasury
Segment Reporting Information [Line Items]
TCCA fees	$ 0	$ 0	$ 0	$ 0