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Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Related Party (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related Parties [Line Items]          
Legislative assessments     $ 3,766 $ 3,745 $ 3,788
Other expenses, net     937 1,118 631
Other liabilities $ 15,392 $ 14,106 15,392 14,106  
Related Party | Treasury | TCCA fees          
Related Parties [Line Items]          
Legislative assessments 3,442 3,431 3,369    
Other liabilities 861 861 861 861  
Related Party | Treasury | Treasury’s Capital Magnet Fund          
Related Parties [Line Items]          
Legislative assessments     56 54 101
Other liabilities 56 54 56 54  
Related Party | FHFA          
Related Parties [Line Items]          
Legislative assessments     164 159 132
Other liabilities 0 0 0 0  
Related Party | Treasury & Freddie Mac          
Related Parties [Line Items]          
Other expenses, net     0 6 15
Other liabilities 0 0 0 0  
Related Party | CSS & Freddie Mac          
Related Parties [Line Items]          
Other expenses, net     68 72 65
Other liabilities $ 0 $ 0 0 0  
Treasury          
Related Parties [Line Items]          
Legislative assessments     $ 3,766 $ 3,745 $ 3,788