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Equity Narratives (Details)
12 Months Ended
Sep. 08, 2008
USD ($)
$ / shares
Sep. 08, 2008
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 07, 2008
$ / shares
Class of Stock [Line Items]                
Common stock outstanding | shares     1,158,082,750 1,158,082,750        
Percentage of common shares attributable to warrants issued to Treasury as a percentage to total diluted common shares upon exercise of the right     79.90%          
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement     $ 116,100,000,000          
Dividends declared on our senior preferred stock     $ 9,624,000,000 $ 10,278,000,000 $ 20,594,000,000      
Convertible Series 2004-1 Preferred Stock [Member]                
Class of Stock [Line Items]                
Conversion price per share | $ / shares     $ 94.31          
Conversion rate     1,060.3329          
Preferred stock redemption price per share | $ / shares     $ 105,000          
Series 2008-2 Senior Preferred Stock [Member]                
Class of Stock [Line Items]                
Senior preferred stock liquidation preference per share | $ / shares $ 1,000 $ 1,000 $ 117,149          
Shares of variable liquidation preference senior preferred stock issued | shares   1,000,000            
Aggregate liquidation preference of senior preferred stock $ 1,000,000,000 $ 1,000,000,000            
Value assigned to Treasury's commitment and recorded as a reduction to additional paid-in-capital $ 4,500,000,000              
Dividends declared on our senior preferred stock     $ 9,600,000,000 10,300,000,000 $ 20,600,000,000      
Preferred Stock Covenant Maximum Fair Market Value of assets and properties per transaction     250,000,000          
Preferred Stock, Covenant, Maximum Aggregate Indebtedness Amount, Current Period     $ 479,000,000,000          
Preferred Stock, Covenant, Current Period Debt v.s. Maximum Mortgage Assets Allowed at Prior Year End, Maximum Ratio     120.00%          
Preferred Stock, Covenant, Maximum Mortgage Assets     $ 339,300,000,000          
Preferred Stock, Covenant, Mortgage Assets at Year End, Maximum Ratio of Preceding Year End     85.00%          
Preferred Stock, Covenant, Minimum Mortgage Assets     $ 250,000,000,000.0          
Minimum [Member] | Series O Preferred Stock [Member]                
Class of Stock [Line Items]                
Preferred stock redemption price per share | $ / shares     $ 50          
Minimum [Member] | Series 2008-2 Senior Preferred Stock [Member]                
Class of Stock [Line Items]                
FHFA Request, Covenant, Mortgage Assets at Year End, Minimum Ratio of Preceding Year End     90.00%          
Maximum [Member] | Series O Preferred Stock [Member]                
Class of Stock [Line Items]                
Preferred stock redemption price per share | $ / shares     $ 52.5          
Maximum [Member] | Series 2008-2 Senior Preferred Stock [Member]                
Class of Stock [Line Items]                
FHFA Request, Covenant, Mortgage Assets at Year End, Minimum Ratio of Preceding Year End     95.00%          
US Treasury [Member]                
Class of Stock [Line Items]                
Percentage of common shares attributable to warrants issued to Treasury as a percentage to total diluted common shares upon exercise of the right     79.90%         79.90%
Aggregate liquidation preference of senior preferred stock     $ 117,100,000,000          
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement     116,100,000,000 116,100,000,000        
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement     1,200,000,000 $ 1,800,000,000        
Common stock warrant exercise price per share | $ / shares               $ 0.00001
Initial aggregate liquidation preference of senior preferred stock held by US Treasury     1,000,000,000          
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement     $ 117,600,000,000          
US Treasury [Member] | Scenario, Forecast [Member]                
Class of Stock [Line Items]                
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement           $ 0 $ 600,000,000