Investments in Securities - Trading 1 (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 61,298	$ 52,552
Mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	1,198	4,770
Non-mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	60,100	47,782
Non-mortgage-related securities | Pledged as collateral
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	9,000	5,700
Consolidated trusts | Mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 320	$ 364