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Summary of Significant Accounting Policies Related Parties (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2020
Mar. 31, 2019
Dec. 31, 2018
Related Parties [Line Items]                  
Deficit Of Core Capital Over Statutory Minimum Capital Requirement   $ (137,000,000,000.0) $ (137,000,000,000.0)   $ (137,000,000,000.0)       $ (137,100,000,000)
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement   119,800,000,000 119,800,000,000   119,800,000,000        
Net worth   6,365,000,000 6,365,000,000   6,365,000,000     $ 5,400,000,000 6,240,000,000
Payments of cash dividends on senior preferred stock to Treasury   $ 2,400,000,000 2,361,000,000 $ 938,000,000 5,601,000,000 $ 938,000,000      
Income Taxes Paid     0   $ 700,000,000 $ 460,000,000      
Weighted Average Number of Shares, Contingently Issuable         4,600,000,000 4,600,000,000      
Temporary Payroll Tax Cut Continuation Act of 2011 (“TCCA”) fees     $ 600,000,000 565,000,000 $ 1,193,000,000 $ 1,122,000,000      
Basis Points of Each Dollar of Unpaid Principal Balance   0.042% 0.042%   0.042%        
Trading, at fair value (includes $2,775 and $3,061, respectively, pledged as collateral)   $ 42,866,000,000 $ 42,866,000,000   $ 42,866,000,000       41,867,000,000
Interest Receivable   9,089,000,000 9,089,000,000   9,089,000,000       $ 8,490,000,000
Interest income recognized on Treasury securities     432,000,000 318,000,000 $ 859,000,000 $ 554,000,000      
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock         131,000,000 131,000,000      
Affordable Housing Program Obligation   0.35 0.35   $ 0.35        
Scenario, Forecast [Member]                  
Related Parties [Line Items]                  
Cumulative Effect Of New Accounting Principle In Period Of Adoption             $ 4,000,000,000    
Payments of cash dividends on senior preferred stock to Treasury $ 3,400,000,000                
US Treasury [Member]                  
Related Parties [Line Items]                  
Total available funding from US Treasury pursuant to the senior preferred stock agreement   113,900,000,000 113,900,000,000   113,900,000,000        
Capital Reserve Amount, current year, Senior Preferred Stock Purchase Agreement, Amendment   3,000,000,000.0 3,000,000,000.0   3,000,000,000.0        
Aggregate liquidation preference of senior preferred stock   $ 123,800,000,000 $ 123,800,000,000   $ 123,800,000,000        
Percentage of common shares attributable to warrants issued to US Treasury as percentage to total diluted common shares   79.90% 79.90%   79.90%        
Home Affordable Modification Program administrative expense reimbursements from Treasury and Freddie Mac     $ 5,000,000 6,000,000 $ 10,000,000 $ 13,000,000      
Temporary Payroll Tax Cut Continuation Act of 2011 (“TCCA”) fees     600,000,000 565,000,000 1,193,000,000 1,122,000,000      
Affordable Housing Program Obligation   $ 75,000,000 75,000,000   75,000,000        
US Treasury [Member] | Single-family [Member]                  
Related Parties [Line Items]                  
Recognized TCCA fees that had not been remitted to Treasury as of period end   600,000,000 600,000,000   600,000,000        
Federal Housing Finance Agency [Member]                  
Related Parties [Line Items]                  
FHFA assessment fees     29,000,000 26,000,000 59,000,000 55,000,000      
Common Securitization Solutions [Member]                  
Related Parties [Line Items]                  
Payments to Acquire or Advance to Equity Method Investments     26,000,000 35,000,000 62,000,000 76,000,000      
Other Expense [Member] | US Treasury [Member]                  
Related Parties [Line Items]                  
Affordable Housing Program Assessments   $ 75,000,000 $ 21,000,000 $ 19,000,000 $ 36,000,000 $ 37,000,000