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Summary of Significant Accounting Policies Organization (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 29, 2017
USD ($)
Sep. 08, 2008
USD ($)
Dec. 31, 2017
USD ($)
segments
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2014
USD ($)
Sep. 07, 2008
$ / shares
Related Parties [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%            
Net worth (deficit)     $ (3,686) $ 6,071 $ 4,059   $ 3,600 $ 3,720  
Payment Of Cash Dividends On Senior Preferred Stock To Treasury $ 648   $ 12,015 9,624 $ 10,278        
Number of Reportable Segments | segments     2            
Number Of Days of Net Worth Deficit Required FHFA Must Place Us Into Receivership 1     60 days            
US Treasury [Member]                  
Related Parties [Line Items]                  
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement     $ 116,100 $ 116,100          
Aggregate liquidation preference of senior preferred stock     120,100            
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement     117,600            
Common stock warrant exercise price per share | $ / shares                 $ 0.00001
Fair value of the warrant at issuance   $ 3,500              
Reduction in Dividends Paid     $ 2,400            
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%
Funding Draw Requested From U.S. Treasury Pursuant to the Senior Preferred Stock Purchase Agreement     $ 3,700            
Scenario, Forecast [Member] | US Treasury [Member]                  
Related Parties [Line Items]                  
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement           $ 119,800      
Aggregate liquidation preference of senior preferred stock           123,800      
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement           $ 113,900