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Fair Value - Levels Hierarchy (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets [Abstract]    
Available-for-sale, at fair value $ 765 $ 837
Mortgage loans held for investment, net of allowance for loan losses 4,071 4,964
Derivative assets at fair value 892 171
Derivative assets, gross amount offset 63 (237)
Liabilities [Abstract]    
Derivative liabilities at fair value 622 233
Derivative liabilities, gross amount offset (3,540)  
Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 631 169
Derivative assets, gross amount offset 0 0
Liabilities [Abstract]    
Derivative liabilities at fair value 498 197
Derivative liabilities, gross amount offset 0 0
Other    
Assets [Abstract]    
Derivative assets at fair value 3 0
Liabilities [Abstract]    
Derivative liabilities at fair value 45 21
Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,866 2,381
Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 18,418 21,735
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 42,142 64,531
Trading securities 60,883 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 103,025 148,112
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 33,800 44,100
Trading securities 3,852 4,568
Available-for-sale, at fair value 72 84
Mortgage loans held for investment, net of allowance for loan losses 3,557,672 3,796,917
Derivative assets at fair value 791 256
Total financial assets 3,616,843 3,875,259
Liabilities [Abstract]    
Derivative liabilities at fair value 4,117 1,385
Total financial liabilities 3,813,360 4,160,859
Significant Other Observable Inputs (Level 2) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 137,063 205,142
Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 3,663,125 3,951,537
Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 0 0
Trading securities 76 57
Available-for-sale, at fair value 693 753
Mortgage loans held for investment, net of allowance for loan losses 180,362 209,090
Derivative assets at fair value 38 152
Total financial assets 185,542 215,567
Liabilities [Abstract]    
Derivative liabilities at fair value 45 21
Total financial liabilities 37,512 33,565
Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 604 799
Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 36,785 32,644
Recurring    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 64,811 88,206
Available-for-sale, at fair value 765 837
Mortgage loans held for investment, net of allowance for loan losses 4,071 4,964
Derivative assets at fair value 892 171
Derivative assets, gross amount offset 63 (237)
Total financial assets 70,539 94,428
Liabilities [Abstract]    
Long-term debt at fair value 20,284 24,116
Derivative liabilities at fair value 622 233
Derivative liabilities, gross amount offset (3,540) (1,173)
Total financial liabilities 20,906 24,349
Recurring | Swaps    
Assets [Abstract]    
Derivative assets at fair value 35 177
Liabilities [Abstract]    
Derivative liabilities at fair value 3,583 1,165
Recurring | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 160 62
Liabilities [Abstract]    
Derivative liabilities at fair value 36 23
Recurring | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 631 169
Liabilities [Abstract]    
Derivative liabilities at fair value 498 197
Recurring | Other    
Assets [Abstract]    
Derivative assets at fair value 3  
Liabilities [Abstract]    
Derivative liabilities at fair value 45 21
Recurring | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,866 2,381
Recurring | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 18,418 21,735
Recurring | Fannie Mae    
Assets [Abstract]    
Trading securities 1,295 1,576
Available-for-sale, at fair value 458 495
Recurring | Other agency    
Assets [Abstract]    
Trading securities 2,508 2,893
Available-for-sale, at fair value 10 12
Recurring | Other securities    
Assets [Abstract]    
Trading securities 112 137
Available-for-sale, at fair value 297 330
Recurring | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 60,896 83,600
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 60,883 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 60,883 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) | Other 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) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 60,883 83,581
Recurring | Significant Other Observable Inputs (Level 2)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   0
Trading securities 3,852 4,568
Available-for-sale, at fair value 72 84
Mortgage loans held for investment, net of allowance for loan losses 3,472 4,209
Derivative assets at fair value 791 256
Total financial assets 8,187 9,117
Liabilities [Abstract]    
Long-term debt at fair value 19,879 23,648
Derivative liabilities at fair value 4,117 1,385
Total financial liabilities 23,996 25,033
Recurring | Significant Other Observable Inputs (Level 2) | Swaps    
Assets [Abstract]    
Derivative assets at fair value 0 25
Liabilities [Abstract]    
Derivative liabilities at fair value 3,583 1,165
Recurring | Significant Other Observable Inputs (Level 2) | Swaptions    
Assets [Abstract]    
Derivative assets at fair value 160 62
Liabilities [Abstract]    
Derivative liabilities at fair value 36 23
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage commitment derivatives    
Assets [Abstract]    
Derivative assets at fair value 631 169
Liabilities [Abstract]    
Derivative liabilities at fair value 498 197
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 1,613 2,008
Recurring | Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 18,266 21,640
Recurring | Significant Other Observable Inputs (Level 2) | Fannie Mae    
Assets [Abstract]    
Trading securities 1,219 1,519
Available-for-sale, at fair value 54 64
Recurring | Significant Other Observable Inputs (Level 2) | Other agency    
Assets [Abstract]    
Trading securities 2,508 2,893
Available-for-sale, at fair value 10 12
Recurring | Significant Other Observable Inputs (Level 2) | Other securities    
Assets [Abstract]    
Trading securities 112 137
Available-for-sale, at fair value 8 8
Recurring | Significant Other Observable Inputs (Level 2) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 13 19
Recurring | Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   0
Trading securities 76 57
Available-for-sale, at fair value 693 753
Mortgage loans held for investment, net of allowance for loan losses 599 755
Derivative assets at fair value 38 152
Total financial assets 1,406 1,717
Liabilities [Abstract]    
Long-term debt at fair value 405 468
Derivative liabilities at fair value 45 21
Total financial liabilities 450 489
Recurring | Significant Unobservable Inputs (Level 3) | Swaps    
Assets [Abstract]    
Derivative assets at fair value 35 152
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 45 21
Recurring | Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 253 373
Recurring | Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 152 95
Recurring | Significant Unobservable Inputs (Level 3) | Fannie Mae    
Assets [Abstract]    
Trading securities 76 57
Available-for-sale, at fair value 404 431
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) | Other securities    
Assets [Abstract]    
Trading securities 0 0
Available-for-sale, at fair value 289 322
Recurring | Significant Unobservable Inputs (Level 3) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities $ 0 $ 0