Segment Reporting (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment	2
Net interest income	$ 7,023	$ 6,786
Fee and other income	72	63
Net revenues	7,095	6,849
Investment gains (losses), net	22	(67)
Fair value gains, net	480	204
Administrative expenses	(929)	(868)
Benefit (provision) for credit losses	180	(132)
TCCA fees	(860)	(855)
Credit enhancement expense	(419)	(341)
Change in expected credit enhancement recoveries	63	120
Other expenses, net	(199)	(130)
Income before federal income taxes	5,433	4,780
Provision for federal income taxes	(1,113)	(1,008)
Net income	4,320	3,772
Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	(860)	(855)
Business segments | Single-Family
Segment Reporting Information [Line Items]
Net interest income	5,874	5,672
Fee and other income	55	48
Net revenues	5,929	5,720
Investment gains (losses), net	13	(71)
Fair value gains, net	484	166
Administrative expenses	(777)	(720)
Benefit (provision) for credit losses	335	47
Credit enhancement expense	(353)	(287)
Change in expected credit enhancement recoveries	(42)	95
Other expenses, net	(176)	(116)
Income before federal income taxes	4,553	3,979
Provision for federal income taxes	(946)	(847)
Net income	3,607	3,132
Business segments | Single-Family | Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	(860)	(855)
Business segments | Multifamily
Segment Reporting Information [Line Items]
Net interest income	1,149	1,114
Fee and other income	17	15
Net revenues	1,166	1,129
Investment gains (losses), net	9	4
Fair value gains, net	(4)	38
Administrative expenses	(152)	(148)
Benefit (provision) for credit losses	(155)	(179)
Credit enhancement expense	(66)	(54)
Change in expected credit enhancement recoveries	105	25
Other expenses, net	(23)	(14)
Income before federal income taxes	880	801
Provision for federal income taxes	(167)	(161)
Net income	713	640
Business segments | Multifamily | Related Party | Treasury
Segment Reporting Information [Line Items]
TCCA fees	$ 0	$ 0