Investments in Securities - Trading 1 (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 64,811	$ 88,206
Mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	3,915	4,606
Fannie Mae
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	1,295	1,576
Other agency
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	2,508	2,893
Other securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	112	137
Non-mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	60,896	83,600
Consolidated trusts
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 469	$ 593