Segment Reporting - Schedule of Segment Reporting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income	$ 28,773	$ 29,423	$ 29,587
Fee and other income	275	312	361
Net revenues	29,048	29,735	29,948
Investment gains (losses), net	(53)	(297)	1,352
Fair value gain (losses), net	1,304	1,284	155
Administrative expenses	(3,604)	(3,329)	(3,065)
Benefit (provision) for credit losses	1,670	(6,277)	5,130
TCCA fees	(3,431)	(3,369)	(3,071)
Credit enhancement expense	(1,512)	(1,323)	(1,051)
Change in expected credit enhancement recoveries	(193)	727	(194)
Other expenses, net	(1,273)	(918)	(1,255)
Income before federal income taxes	21,956	16,233	27,949
Provision for federal income taxes	(4,548)	(3,310)	(5,773)
Net income	17,408	12,923	22,176
US Treasury
Segment Reporting Information [Line Items]
TCCA fees	(3,431)	(3,369)	(3,071)
Operating Segments | Single-Family
Segment Reporting Information [Line Items]
Net interest income	24,229	24,736	25,429
Fee and other income	205	224	269
Net revenues	24,434	24,960	25,698
Investment gains (losses), net	(41)	(223)	1,392
Fair value gain (losses), net	1,231	1,364	167
Administrative expenses	(2,993)	(2,789)	(2,557)
Benefit (provision) for credit losses	2,165	(5,029)	4,600
Credit enhancement expense	(1,281)	(1,062)	(812)
Change in expected credit enhancement recoveries	(310)	470	(86)
Other expenses, net	(984)	(778)	(1,208)
Income before federal income taxes	18,790	13,544	24,123
Provision for federal income taxes	(3,935)	(2,774)	(4,996)
Net income	14,855	10,770	19,127
Operating Segments | Multifamily
Segment Reporting Information [Line Items]
Net interest income	4,544	4,687	4,158
Fee and other income	70	88	92
Net revenues	4,614	4,775	4,250
Investment gains (losses), net	(12)	(74)	(40)
Fair value gain (losses), net	73	(80)	(12)
Administrative expenses	(611)	(540)	(508)
Benefit (provision) for credit losses	(495)	(1,248)	530
Credit enhancement expense	(231)	(261)	(239)
Change in expected credit enhancement recoveries	117	257	(108)
Other expenses, net	(289)	(140)	(47)
Income before federal income taxes	3,166	2,689	3,826
Provision for federal income taxes	(613)	(536)	(777)
Net income	2,553	2,153	3,049
Operating Segments | US Treasury | Single-Family
Segment Reporting Information [Line Items]
TCCA fees	(3,431)	(3,369)	(3,071)
Operating Segments | US Treasury | Multifamily
Segment Reporting Information [Line Items]
TCCA fees	$ 0	$ 0	$ 0