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Fair Value - Levels Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets [Abstract]    
Available-for-sale, at fair value $ 806 $ 837
Mortgage loans held for investment, net of allowance for loan losses 4,492 4,964
Derivative assets at fair value 1,824 171
Derivative assets, gross amount offset (109) (237)
Liabilities [Abstract]    
Derivative liabilities at fair value 1,204 233
Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 1,739 169
Derivative assets, gross amount offset 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 1,141 197
Derivative liabilities, gross amount offset 0 0
Other    
Assets [Abstract]    
Derivative assets at fair value 3 0
Liabilities [Abstract]    
Derivative liabilities at fair value 28 21
Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 2,091 2,381
Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 20,117 21,735
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 51,656 64,531
Trading securities 79,987 83,581
Available-for-sale, at fair value 0 0
Mortgage loans held for investment, net of allowance for loan losses 0 0
Derivative assets at fair value 0 0
Total financial assets 131,643 148,112
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Total financial liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 0 0
Significant Other Observable Inputs (Level 2)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 37,325 44,100
Trading securities 4,595 4,568
Available-for-sale, at fair value 79 84
Mortgage loans held for investment, net of allowance for loan losses 3,672,291 3,796,917
Derivative assets at fair value 1,848 256
Total financial assets 3,741,334 3,875,259
Liabilities [Abstract]    
Derivative liabilities at fair value 4,057 1,385
Total financial liabilities 3,982,204 4,160,859
Significant Other Observable Inputs (Level 2) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 178,526 205,142
Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 3,795,577 3,951,537
Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 0 0
Trading securities 47 57
Available-for-sale, at fair value 727 753
Mortgage loans held for investment, net of allowance for loan losses 192,844 209,090
Derivative assets at fair value 85 152
Total financial assets 198,891 215,567
Liabilities [Abstract]    
Derivative liabilities at fair value 28 21
Total financial liabilities 33,826 33,565
Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 700 799
Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 33,002 32,644
Recurring    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 84,629 88,206
Available-for-sale, at fair value 806 837
Mortgage loans held for investment, net of allowance for loan losses 4,492 4,964
Derivative assets at fair value 1,824 171
Derivative assets, gross amount offset (109) (237)
Total financial assets 91,751 94,428
Liabilities [Abstract]    
Long-term debt at fair value 22,208 24,116
Derivative liabilities at fair value 1,204 233
Derivative liabilities, gross amount offset (2,881) (1,173)
Total financial liabilities 23,412 24,349
Recurring | Swaps    
Assets [Abstract]    
Derivative assets at fair value 89 177
Liabilities [Abstract]    
Derivative liabilities at fair value 2,895 1,165
Recurring | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 102 62
Liabilities [Abstract]    
Derivative liabilities at fair value 21 23
Recurring | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 1,739 169
Liabilities [Abstract]    
Derivative liabilities at fair value 1,141 197
Recurring | Other    
Assets [Abstract]    
Derivative assets at fair value 3  
Liabilities [Abstract]    
Derivative liabilities at fair value 28 21
Recurring | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 2,091 2,381
Recurring | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 20,117 21,735
Recurring | Fannie Mae    
Assets [Abstract]    
Trading securities 1,789 1,576
Available-for-sale, at fair value 476 495
Recurring | Other agency    
Assets [Abstract]    
Trading securities 2,710 2,893
Available-for-sale, at fair value 12 12
Recurring | Private-label and other mortgage securities    
Assets [Abstract]    
Trading securities 127 137
Available-for-sale, at fair value 5 5
Recurring | U.S. Treasury securities    
Assets [Abstract]    
Trading securities 79,987 83,581
Recurring | Other securities    
Assets [Abstract]    
Trading securities 16 19
Recurring | Mortgage revenue bonds    
Assets [Abstract]    
Available-for-sale, at fair value 141 144
Recurring | Other    
Assets [Abstract]    
Available-for-sale, at fair value 172 181
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 79,987 83,581
Available-for-sale, at fair value 0 0
Mortgage loans held for investment, net of allowance for loan losses 0 0
Derivative assets at fair value 0 0
Total financial assets 79,987 83,831
Liabilities [Abstract]    
Long-term debt at fair value 0 0
Derivative liabilities at fair value 0 0
Total financial liabilities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Swaps    
Assets [Abstract]    
Derivative assets at fair value 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other    
Assets [Abstract]    
Derivative assets at fair value 0  
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fannie Mae    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other agency    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private-label and other mortgage securities    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities    
Assets [Abstract]    
Trading securities 79,987 83,581
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities    
Assets [Abstract]    
Trading securities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage revenue bonds    
Assets [Abstract]    
Available-for-sale, at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other    
Assets [Abstract]    
Available-for-sale, at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   0
Trading securities 4,595 4,568
Available-for-sale, at fair value 79 84
Mortgage loans held for investment, net of allowance for loan losses 3,824 4,209
Derivative assets at fair value 1,848 256
Total financial assets 10,346 9,117
Liabilities [Abstract]    
Long-term debt at fair value 21,740 23,648
Derivative liabilities at fair value 4,057 1,385
Total financial liabilities 25,797 25,033
Recurring | Significant Other Observable Inputs (Level 2) | Swaps    
Assets [Abstract]    
Derivative assets at fair value 7 25
Liabilities [Abstract]    
Derivative liabilities at fair value 2,895 1,165
Recurring | Significant Other Observable Inputs (Level 2) | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 102 62
Liabilities [Abstract]    
Derivative liabilities at fair value 21 23
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 1,739 169
Liabilities [Abstract]    
Derivative liabilities at fair value 1,141 197
Recurring | Significant Other Observable Inputs (Level 2) | Other    
Assets [Abstract]    
Derivative assets at fair value 0  
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,784 2,008
Recurring | Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 19,956 21,640
Recurring | Significant Other Observable Inputs (Level 2) | Fannie Mae    
Assets [Abstract]    
Trading securities 1,742 1,519
Available-for-sale, at fair value 58 64
Recurring | Significant Other Observable Inputs (Level 2) | Other agency    
Assets [Abstract]    
Trading securities 2,710 2,893
Available-for-sale, at fair value 12 12
Recurring | Significant Other Observable Inputs (Level 2) | Private-label and other mortgage securities    
Assets [Abstract]    
Trading securities 127 137
Available-for-sale, at fair value 5 3
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Assets [Abstract]    
Trading securities 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Other securities    
Assets [Abstract]    
Trading securities 16 19
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage revenue bonds    
Assets [Abstract]    
Available-for-sale, at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Other    
Assets [Abstract]    
Available-for-sale, at fair value 4 5
Recurring | Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   0
Trading securities 47 57
Available-for-sale, at fair value 727 753
Mortgage loans held for investment, net of allowance for loan losses 668 755
Derivative assets at fair value 85 152
Total financial assets 1,527 1,717
Liabilities [Abstract]    
Long-term debt at fair value 468 468
Derivative liabilities at fair value 28 21
Total financial liabilities 496 489
Recurring | Significant Unobservable Inputs (Level 3) | Swaps    
Assets [Abstract]    
Derivative assets at fair value 82 152
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Other    
Assets [Abstract]    
Derivative assets at fair value 3  
Liabilities [Abstract]    
Derivative liabilities at fair value 28 21
Recurring | Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 307 373
Recurring | Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 161 95
Recurring | Significant Unobservable Inputs (Level 3) | Fannie Mae    
Assets [Abstract]    
Trading securities 47 57
Available-for-sale, at fair value 418 431
Recurring | Significant Unobservable Inputs (Level 3) | Other agency    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Private-label and other mortgage securities    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 0 2
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities    
Assets [Abstract]    
Trading securities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Other securities    
Assets [Abstract]    
Trading securities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage revenue bonds    
Assets [Abstract]    
Available-for-sale, at fair value 141 144
Recurring | Significant Unobservable Inputs (Level 3) | Other    
Assets [Abstract]    
Available-for-sale, at fair value $ 168 $ 176