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Mortgage Loans Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans $ 3,493,676   $ 3,493,676     $ 3,299,954
Total Loan, Cost Basis and Fair Value Adjustments, Net 65,370   65,370     43,224
Allowance for Loan and Lease Losses, Real Estate 11,703   11,703   $ 10,738 9,016
Total mortgage loans 3,547,343   3,547,343     3,334,162
Interest Receivable 9,748   9,748     8,604
Financing Receivable, before Allowance for Credit Loss 3,550,734   3,550,734     3,336,405
Single-family [Member]            
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 3,137,726   3,137,726     2,972,361
Financing Receivable, Reclassification to Held-for-sale 5,305 $ 5,154 6,942 $ 15,287    
Financing Receivable, Sale 4,593 3,941 5,088 10,497    
Gain (Loss) on Sale of Mortgage Loans 424 184 464 504    
Mortgage Loans in Process of Foreclosure, Amount 6,000   6,000     7,600
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 219   573      
Financing Receivable, before Allowance for Credit Loss 3,179,241   3,179,241      
Single-family [Member] | allowance for the redesignated from HFI to HFS            
Loans in Mortgage Portfolio [Line Items]            
Allowance for Loan and Lease Losses, Period Increase (Decrease) (227) (227) (236) (946)    
Charge-offs 737 $ 780 921 $ 2,149    
Multifamily [Member]            
Loans in Mortgage Portfolio [Line Items]            
Unpaid principal balance of mortgage loans 355,950   355,950     327,593
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 8   9      
Mortgage loans [Member]            
Loans in Mortgage Portfolio [Line Items]            
Interest Receivable $ 9,600   $ 9,600     $ 8,400