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Fair Value - Levels Hierarchy (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Assets [Abstract]    
Available-for-sale, at fair value $ 741 $ 837
Mortgage loans held for investment, net of allowance for loan losses 3,691 4,964
Derivative assets at fair value 498 171
Derivative assets, gross amount offset (163) (237)
Liabilities [Abstract]    
Derivative liabilities at fair value 923 233
Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,766 2,381
Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 16,758 21,735
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 40,461 64,531
Trading securities 54,687 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 95,148 148,112
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 23,100 44,100
Trading securities 3,526 4,568
Available-for-sale, at fair value 67 84
Mortgage loans held for investment, net of allowance for loan losses 3,371,881 3,796,917
Derivative assets at fair value 628 256
Total financial assets 3,427,472 3,875,259
Liabilities [Abstract]    
Derivative liabilities at fair value 5,691 1,385
Total financial liabilities 3,592,135 4,160,859
Significant Other Observable Inputs (Level 2) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 124,513 205,142
Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 3,458,942 3,951,537
Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents 0 0
Trading securities 40 57
Available-for-sale, at fair value 674 753
Mortgage loans held for investment, net of allowance for loan losses 169,412 209,090
Derivative assets at fair value 33 152
Total financial assets 173,848 215,567
Liabilities [Abstract]    
Derivative liabilities at fair value 65 21
Total financial liabilities 39,104 33,565
Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 538 799
Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 38,421 32,644
Recurring    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 58,253 88,206
Available-for-sale, at fair value 741 837
Mortgage loans held for investment, net of allowance for loan losses 3,691 4,964
Derivative assets at fair value 498 171
Derivative assets, gross amount offset (163) (237)
Total financial assets 63,183 94,428
Liabilities [Abstract]    
Long-term debt at fair value 18,524 24,116
Derivative liabilities at fair value 923 233
Derivative liabilities, gross amount offset (4,833) (1,173)
Total financial liabilities 19,447 24,349
Recurring | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,766 2,381
Recurring | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 16,758 21,735
Recurring | Mortgage-related    
Assets [Abstract]    
Trading securities 3,551 4,606
Recurring | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 54,702 83,600
Recurring | Other agency    
Assets [Abstract]    
Available-for-sale, at fair value 453 507
Recurring | Other mortgage-related    
Assets [Abstract]    
Available-for-sale, at fair value 288 330
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   250
Trading securities 54,687 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 54,687 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) | 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) | Mortgage-related    
Assets [Abstract]    
Trading securities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 54,687 83,581
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other agency    
Assets [Abstract]    
Available-for-sale, at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other mortgage-related    
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 3,526 4,568
Available-for-sale, at fair value 67 84
Mortgage loans held for investment, net of allowance for loan losses 3,146 4,209
Derivative assets at fair value 628 256
Total financial assets 7,367 9,117
Liabilities [Abstract]    
Long-term debt at fair value 18,129 23,648
Derivative liabilities at fair value 5,691 1,385
Total financial liabilities 23,820 25,033
Recurring | Significant Other Observable Inputs (Level 2) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 1,512 2,008
Recurring | Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 16,617 21,640
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-related    
Assets [Abstract]    
Trading securities 3,511 4,549
Recurring | Significant Other Observable Inputs (Level 2) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 15 19
Recurring | Significant Other Observable Inputs (Level 2) | Other agency    
Assets [Abstract]    
Available-for-sale, at fair value 60 76
Recurring | Significant Other Observable Inputs (Level 2) | Other mortgage-related    
Assets [Abstract]    
Available-for-sale, at fair value 7 8
Recurring | Significant Unobservable Inputs (Level 3)    
Assets [Abstract]    
Cash equivalents, including restricted cash equivalents   0
Trading securities 40 57
Available-for-sale, at fair value 674 753
Mortgage loans held for investment, net of allowance for loan losses 545 755
Derivative assets at fair value 33 152
Total financial assets 1,292 1,717
Liabilities [Abstract]    
Long-term debt at fair value 395 468
Derivative liabilities at fair value 65 21
Total financial liabilities 460 489
Recurring | Significant Unobservable Inputs (Level 3) | Fannie Mae    
Liabilities [Abstract]    
Long-term debt at fair value 254 373
Recurring | Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Liabilities [Abstract]    
Long-term debt at fair value 141 95
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-related    
Assets [Abstract]    
Trading securities 40 57
Recurring | Significant Unobservable Inputs (Level 3) | Non-mortgage-related securities    
Assets [Abstract]    
Trading securities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Other agency    
Assets [Abstract]    
Available-for-sale, at fair value 393 431
Recurring | Significant Unobservable Inputs (Level 3) | Other mortgage-related    
Assets [Abstract]    
Available-for-sale, at fair value $ 281 $ 322