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Fair Value Option (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 8,922 $ 10,596
Fair value of nonaccrual loans 161 227
Difference between unpaid principal balance and the fair value of nonaccrual loans 19 46
Fair value of loans that are 90 days past due 102 159
Difference between unpaid principal balance and the fair value of these 90 days or more days past due loans $ 14 $ 34
Single-Family [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Serious delinquency: days past due 90 days 90 days
Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt, fair value $ 23,753 $ 30,493
Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt, fair value 6,826 8,186
Loans [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 8,922 10,596
Loans, unpaid principal balance 8,832 10,246
Fair Value, Option, Changes in Fair Value, Gain (Loss) (128) 136
Long-term debt [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Fair Value, Option, Changes in Fair Value, Gain (Loss) 688 (294)
Long-term debt [Member] | Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt, fair value 23,753 30,493
Long-Term Debt, unpaid principal balance 22,080 27,717
Long-term debt [Member] | Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt, fair value 6,826 8,186
Long-Term Debt, unpaid principal balance $ 6,241 $ 7,368