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Equity (Deficit) Narratives (Details)
12 Months Ended
Dec. 30, 2017
USD ($)
Dec. 29, 2017
USD ($)
Sep. 08, 2008
USD ($)
$ / shares
Sep. 08, 2008
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2013
USD ($)
Sep. 07, 2008
$ / shares
Class of Stock [Line Items]                              
Common stock outstanding | shares         1,158,087,567 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%                    
Dividends declared on our senior preferred stock         $ 12,015,000,000 $ 9,624,000,000 $ 10,278,000,000                
Net worth (deficit)         (3,686,000,000) 6,071,000,000 4,059,000,000       $ 3,600,000,000 $ 3,720,000,000      
Payment Of Cash Dividends On Senior Preferred Stock To Treasury   $ 648,000,000     $ 12,015,000,000 9,624,000,000 10,278,000,000                
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         $ 12,000,000,000 9,600,000,000 10,300,000,000                
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         $ 407,200,000,000.0                    
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         $ 288,400,000,000                    
Payment Of Cash Dividends On Senior Preferred Stock To Treasury $ 648,000,000                            
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%                    
Scenario, Forecast [Member] | Series 2008-2 Senior Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Covenant, Maximum Mortgage Assets               $ 250,000,000,000              
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%
Additional Liquidation Preference of Senior Preferred Stock         $ 3,000,000,000                    
Aggregate liquidation preference of senior preferred stock         120,100,000,000                    
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement         116,100,000,000 116,100,000,000                  
Funding Draw Requested From U.S. Treasury Pursuant to the Senior Preferred Stock Purchase Agreement         3,700,000,000                    
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement         600,000,000 1,200,000,000       $ 0 $ 600,000,000   $ 3,000,000,000    
Annual Reduction of Capital Reserve Amount from 2013 to 2017, Senior Preferred Stock Purchase Agreement, Amendment         600,000,000 $ 600,000,000 $ 600,000,000             $ 600,000,000  
Common stock warrant exercise price per share | $ / shares                             $ 0.00001
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement         117,600,000,000                    
Reduction in Dividends Paid         $ 2,400,000,000                    
US Treasury [Member] | Scenario, Forecast [Member]                              
Class of Stock [Line Items]                              
Aggregate liquidation preference of senior preferred stock                 $ 123,800,000,000            
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement                 119,800,000,000            
Capital Reserve Amount, Fiscal Year, Senior Preferred Stock Purchase Agreement, December 2017 Amendment                   $ 3,000,000,000          
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement                 $ 113,900,000,000