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Investments in Securities - Investments In Trading Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments in Trading Securities [Line Items]    
Total trading securities $ 78,728 $ 52,552
Amortized cost 487 584
Total available-for-sale securities 469 564
Total investments in securities 79,197 53,116
Mortgage-related securities    
Schedule of Investments in Trading Securities [Line Items]    
Total trading securities 1,098 4,770
Mortgage-related securities | Consolidated Trusts    
Schedule of Investments in Trading Securities [Line Items]    
Total trading securities 300 364
Non-mortgage-related securities    
Schedule of Investments in Trading Securities [Line Items]    
Total trading securities 77,630 47,782
Non-mortgage-related securities | Pledged as collateral    
Schedule of Investments in Trading Securities [Line Items]    
Total trading securities $ 8,900 $ 5,700