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Summary of Significant Accounting Policies Related Parties (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Related Parties [Line Items]                      
Net worth   $ 6,975.0     $ 6,975.0     $ (3,686.0) $ 7,500.0    
Payments of cash dividends on senior preferred stock to Treasury   4,500.0 $ 0.0   5,397.0 $ 11,367.0          
Income Taxes Paid   $ 0.0   $ 600.0 $ 460.0 $ 1,670.0          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%             35.00%      
Effective Income Tax Rate Reconciliation, Percent   20.70%   33.50% 20.60% 33.30%          
Weighted Average Number of Shares, Contingently Issuable         4,600 4,600          
Temporary Payroll Tax Cut Continuation Act of 2011 (“TCCA”) fees   $ 576.0   $ 531.0 $ 1,698.0 $ 1,552.0          
Unpaid principal balance guaranteed by a related party   $ 4,600.0     $ 4,600.0            
Basis Points of Each Dollar of Unpaid Principal Balance   420.00%     420.00%            
Trading, at fair value (includes $3,734 and $747, respectively, pledged as collateral)   $ 43,901.0     $ 43,901.0     $ 34,679.0      
Interest Receivable   8,792.0     8,792.0     8,133.0      
Interest income recognized on Treasury securities   363.0   $ 195.0 $ 917.0 $ 513.0          
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock       0 131 131          
Scenario, Forecast [Member]                      
Related Parties [Line Items]                      
Expected undeclared dividends payable on senior preferred stock for the next quarter             $ 4,000.0        
US Treasury [Member]                      
Related Parties [Line Items]                      
Aggregate Funding Received From US Treasury Pursuant To the Senior Preferred Stock Purchase Agreement During Period     $ (3,700.0)                
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement   119,800.0     $ 119,800.0            
Total available funding from US Treasury pursuant to the senior preferred stock agreement   113,900.0     113,900.0            
Capital Reserve Amount, current year, Senior Preferred Stock Purchase Agreement, Amendment   3,000.0     3,000.0            
Aggregate liquidation preference of senior preferred stock   $ 123,800.0     $ 123,800.0            
Percentage of common shares attributable to warrants issued to US Treasury as percentage to total diluted common shares   79.90%     79.90%            
Home Affordable Modification Program administrative expense reimbursements from Treasury and Freddie Mac   $ 6.0   $ 9.0 $ 19.0 $ 32.0          
Percentage of initial principal loss US Treasury will bear for New Issue Bond Program   35.00%     35.00%            
Temporary Payroll Tax Cut Continuation Act of 2011 (“TCCA”) fees   $ 576.0   531.0 $ 1,698.0 1,552.0          
US Treasury [Member] | Single-family [Member]                      
Related Parties [Line Items]                      
Recognized TCCA fees that had not been remitted to Treasury as of period end   576.0     576.0            
Freddie Mac [Member] | Freddie Mac [Member]                      
Related Parties [Line Items]                      
Interest Receivable   2.0     2.0     2.0      
Fair value of mortgage-related securities   497.0     497.0     613.0      
Interest income recognized on mortgage-related securities   6.0   8.0 19.0 31.0          
Federal Housing Finance Agency [Member]                      
Related Parties [Line Items]                      
FHFA assessment fees   26.0   26.0 81.0 82.0          
Common Securitization Solutions [Member]                      
Related Parties [Line Items]                      
Payments to Acquire or Advance to Equity Method Investments   33.0   25.0 109.0 78.0          
U.S. Treasury securities [Member]                      
Related Parties [Line Items]                      
Trading, at fair value (includes $3,734 and $747, respectively, pledged as collateral)   37,328.0     37,328.0     29,222.0      
U.S. Treasury securities [Member] | US Treasury [Member]                      
Related Parties [Line Items]                      
Trading, at fair value (includes $3,734 and $747, respectively, pledged as collateral)   37,600.0     37,600.0     29,200.0      
Interest Receivable   124.0     124.0     77.0      
Interest income recognized on Treasury securities   192.0   95.0 485.0 244.0          
Other Expense [Member] | US Treasury [Member]                      
Related Parties [Line Items]                      
Affordable Housing Program Assessments   20.0   16.0 57.0 46.0          
Recognized affordable housing program expenses that had not been remitted to Treasury as of period end   57.0     57.0            
Accumulated other comprehensive income [Member]                      
Related Parties [Line Items]                      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   0.0   0.0 117.0 0.0          
Net worth   $ 313.0   $ 707.0 $ 313.0 $ 707.0   $ 553.0 $ 349.0 $ 682.0 $ 759.0