Investments in Securities - Trading 1 (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 49,361	$ 52,552
Mortgage-related
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	1,714	4,770
Non-mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	47,647	47,782
Non-mortgage-related securities | Pledged as collateral
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	4,900	5,700
Consolidated trusts | Mortgage-related
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 343	$ 364