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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]      
Weighted average number of contingently issuable shares (shares) 4,700 4,700  
Incremental common shares attributable to dilutive effect of conversion of preferred stock (in shares) 26    
Investment in securities, trading, at fair value $ 78,902   $ 78,728
Assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 71,495   56,264
Securities received as collateral 71,500   56,300
Fair value of securities received as collateral that can be resold or repledged 69,300   49,000
Acquired property 1,700   1,700
Asset pledged as collateral with right to sell or repledge      
Debt and Equity Securities, FV-NI [Line Items]      
Assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 3,200   2,700
Non-mortgage-related securities      
Debt and Equity Securities, FV-NI [Line Items]      
Investment in securities, trading, at fair value 77,884   77,630
Non-mortgage-related securities | Pledged as collateral      
Debt and Equity Securities, FV-NI [Line Items]      
Investment in securities, trading, at fair value $ 9,400   $ 8,900