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Summary of Significant Accounting Policies (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2008
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Related Parties [Line Items]              
Senior preferred stock liquidation preference   $ 158,844   $ 158,844     $ 142,192
Increase in net worth   $ 4,800          
Weighted average number of contingently issuable shares (shares)   4,700 4,700 4,700 4,700    
Convertible Preferred Stock, Shares Issued upon Conversion   26 26 26 26    
Preferred Stock | US Treasury              
Related Parties [Line Items]              
Shares issued (shares) 1            
Common Stock | US Treasury              
Related Parties [Line Items]              
Authorized proceeds from issuance of stock not requiring prior consent $ 70,000            
US Treasury              
Related Parties [Line Items]              
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement   $ 119,800   $ 119,800      
Total available funding from US Treasury pursuant to the senior preferred stock agreement   $ 113,900   $ 113,900      
US Treasury | Forecast              
Related Parties [Line Items]              
Aggregate liquidation preference of senior preferred stock           $ 163,700