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Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2008
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Related Parties [Line Items]          
Net worth   $ 90,500      
Senior preferred stock liquidation preference   207,982 $ 203,500   $ 195,224
Increase in net worth   $ 4,000 $ 4,500    
Series 2008-2 Senior Preferred Stock          
Related Parties [Line Items]          
Stock issued (in shares) 1        
Forecast          
Related Parties [Line Items]          
Senior preferred stock liquidation preference       $ 212,000  
Related Party | Treasury          
Related Parties [Line Items]          
Percentage of common shares attributable to warrants   79.90%      
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement   $ 119,800      
Total available funding from US Treasury pursuant to the senior preferred stock agreement   113,900      
Treasury          
Related Parties [Line Items]          
Aggregate liquidation preference of senior preferred stock   $ 208,000