Segment Reporting (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment	2
Net interest income	$ 6,786	$ 7,399
Fee and other income	63	83
Net revenues	6,849	7,482
Investment gains (losses), net	(67)	(102)
Fair value gains, net	204	480
Administrative expenses	(868)	(808)
Benefit (provision) for credit losses	(132)	(240)
TCCA fees	(855)	(824)
Credit enhancement expense	(341)	(278)
Change in expected credit enhancement recoveries	120	60
Other expenses, net	(130)	(197)
Income before federal income taxes	4,780	5,573
Provision for federal income taxes	(1,008)	(1,165)
Net income	3,772	4,408
US Treasury
Segment Reporting Information [Line Items]
TCCA fees	(855)	(824)
Business segments | Single-Family
Segment Reporting Information [Line Items]
Net interest income	5,672	6,255
Fee and other income	48	61
Net revenues	5,720	6,316
Investment gains (losses), net	(71)	(66)
Fair value gains, net	166	527
Administrative expenses	(720)	(683)
Benefit (provision) for credit losses	47	(270)
Credit enhancement expense	(287)	(210)
Change in expected credit enhancement recoveries	95	69
Other expenses, net	(116)	(164)
Income before federal income taxes	3,979	4,695
Provision for federal income taxes	(847)	(986)
Net income	3,132	3,709
Business segments | Single-Family | US Treasury
Segment Reporting Information [Line Items]
TCCA fees	(855)	(824)
Business segments | Multifamily
Segment Reporting Information [Line Items]
Net interest income	1,114	1,144
Fee and other income	15	22
Net revenues	1,129	1,166
Investment gains (losses), net	4	(36)
Fair value gains, net	38	(47)
Administrative expenses	(148)	(125)
Benefit (provision) for credit losses	(179)	30
Credit enhancement expense	(54)	(68)
Change in expected credit enhancement recoveries	25	(9)
Other expenses, net	(14)	(33)
Income before federal income taxes	801	878
Provision for federal income taxes	(161)	(179)
Net income	640	699
Business segments | Multifamily | US Treasury
Segment Reporting Information [Line Items]
TCCA fees	$ 0	$ 0