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Summary of Significant Accounting Policies Related Parties (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Jan. 01, 2018
Sep. 08, 2008
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 07, 2008
Related Parties [Line Items]                                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%                     21.00% 35.00% 35.00%    
Convertible preferred stock                         131,000,000        
Weighted-average shares of common stock that would be issued upon the full exercise of the warrant issued to Treasury                       4,600,000,000 4,600,000,000 4,600,000,000 4,600,000,000    
Reduction in Dividends Paid               $ 2,400,000,000           $ 2,400,000,000      
Number of days after which we have not been paying debts or liabilities exceed assets FHFA must place us into receivership                         60 days        
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement               3,000,000,000.0           3,000,000,000.0      
Net worth (deficit)       $ 6,240,000,000       3,686,000,000       $ 6,071,000,000 $ 6,240,000,000 3,686,000,000 $ 6,071,000,000 $ 4,059,000,000  
Payment Of Cash Dividends On Senior Preferred Stock To Treasury       4,000,000,000.0                 9,372,000,000 12,015,000,000 9,624,000,000    
Income taxes paid                         460,000,000 3,090,000,000 1,711,000,000    
Temporary Payroll Cut Continuation Act of 2011 (TCCA) fees       $ (586,000,000) $ (576,000,000) $ (565,000,000) $ (557,000,000) (544,000,000) $ (531,000,000) $ (518,000,000) $ (503,000,000)   $ (2,284,000,000) (2,096,000,000) (1,845,000,000)    
Basis Points of Each Dollar of Unpaid Principal Balance       420.00%                 420.00%        
Trading, at fair value       $ 41,867,000,000       34,679,000,000         $ 41,867,000,000 34,679,000,000      
Interest Income recognized on Treasury Securities       419,000,000 $ 363,000,000 $ 318,000,000 $ 236,000,000 193,000,000 $ 195,000,000 $ 176,000,000 $ 142,000,000   1,336,000,000 706,000,000 516,000,000    
Accrued interest receivable       8,490,000,000       8,133,000,000         8,490,000,000 8,133,000,000      
U.S. Treasury Securities [Member]                                  
Related Parties [Line Items]                                  
Trading, at fair value       35,502,000,000       29,222,000,000         35,502,000,000 29,222,000,000      
Scenario, Forecast [Member]                                  
Related Parties [Line Items]                                  
Payment Of Cash Dividends On Senior Preferred Stock To Treasury $ 3,200,000,000                                
Series 2008-2 Senior Preferred Stock [Member]                                  
Related Parties [Line Items]                                  
Shares of variable liquidation preference senior preferred stock issued     1,000,000                            
Aggregate liquidation preference of senior preferred stock     $ 1,000,000,000.0                            
Payment Of Cash Dividends On Senior Preferred Stock To Treasury                         9,400,000,000 12,000,000,000 9,600,000,000    
US Treasury [Member]                                  
Related Parties [Line Items]                                  
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement       119,800,000,000       116,100,000,000       $ 116,100,000,000 119,800,000,000 116,100,000,000 116,100,000,000    
Aggregate liquidation preference of senior preferred stock       123,800,000,000                 123,800,000,000        
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement       $ 113,900,000,000                 $ 113,900,000,000        
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement   $ 3,000,000,000.0                              
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%        
Common stock warrant exercise price per share                                 $ 0.00001
Fair value of the warrant at issuance     $ 3,500,000,000                            
Home Affordable Modification Program administrative expense reimbursements                         $ 24,000,000 40,000,000 57,000,000    
Basis Points Increase of Guarantee Fee Rate Resulting from the Temporary Payroll Tax Cut Continuation Act of 2011.       1000.00%                 1000.00%        
Temporary Payroll Cut Continuation Act of 2011 (TCCA) fees                         $ (2,284,000,000) (2,096,000,000) (1,845,000,000)    
Recognized TCCA fees that had not been remitted to Treasury as of period end               $ 544,000,000           544,000,000      
US Treasury [Member] | Other Expense [Member]                                  
Related Parties [Line Items]                                  
Affordable Housing Program Assessments                         75,000,000 84,000,000 137,000,000    
Federal Housing Finance Agency [Member]                                  
Related Parties [Line Items]                                  
FHFA assessment fees/expense                         110,000,000 112,000,000 114,000,000    
Common Securitization Solutions [Member]                                  
Related Parties [Line Items]                                  
Payments to Acquire Equity Method Investments                         135,000,000 $ 102,000,000 $ 118,000,000    
Single-Family [Member] | US Treasury [Member]                                  
Related Parties [Line Items]                                  
Recognized TCCA fees that had not been remitted to Treasury as of period end       $ 586,000,000                 $ 586,000,000