Investments in Securities - Trading 1 (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 76,992	$ 78,728
Amortized cost	451	487
Available-for-sale securities	438	469
Total investments in securities	77,430	79,197
Mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	1,185	1,098
Non-mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	75,807	77,630
Consolidated trusts | Mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 275	$ 300