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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (1,781) $ (2,266)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,126) (2,315)
Mortgage loans held for investment, at fair value 8,752 8,922
Derivative assets, gross amount offset (1,781) (2,266)
Derivative liabilities, gross amount offset (2,126) (2,315)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 34,641 34,073
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 35,020 35,502
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total financial assets 69,661 69,575
Financial liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 17,600 15,350
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,250 32,938
Trading securities 5,812 6,332
Available-for-sale securities 2,230 2,477
Mortgage loans held for sale 2,729 238
Mortgage loans held for investment, at fair value 2,982,238 2,990,104
Advances to lenders 4,244 3,354
Derivatives assets at fair value 2,129 2,515
Guaranty assets and buy-ups 0 0
Total financial assets 3,039,232 3,053,308
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,886 3,077
Guaranty obligations 0 0
Total financial liabilities 3,348,843 3,303,620
Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 67 33
Available-for-sale securities 984 952
Mortgage loans held for sale 7,931 7,856
Mortgage loans held for investment, at fair value 275,207 216,404
Advances to lenders 2 2
Derivatives assets at fair value 236 209
Guaranty assets and buy-ups 370 356
Total financial assets 284,797 225,812
Financial liabilities [Abstract]    
Derivative liabilities at fair value 33 15
Guaranty obligations 107 121
Total financial liabilities 44,158 39,950
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 6,682 6,826
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Short-term debt 23,078 24,901
Long-term debt 204,060 211,403
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 813 771
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 23,050 23,753
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,118,819 3,064,239
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Long-term debt 43,205 39,043
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,241 49,423
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,250 32,938
Trading securities 40,899 41,867
Available-for-sale securities 3,214 3,429
Mortgage loans held for sale 10,066 7,701
Mortgage loans held for investment, at fair value 3,249,699 3,241,694
Advances to lenders 4,246 3,356
Derivatives assets at fair value 584 458
Guaranty assets and buy-ups 159 147
Total financial assets 3,383,358 3,381,013
Financial liabilities [Abstract]    
Derivative liabilities at fair value 793 777
Guaranty obligations 170 160
Total financial liabilities 3,395,973 3,392,857
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 23,071 24,896
Long-term debt 198,167 207,178
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,173,772 3,159,846
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,241 49,423
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,250 32,938
Trading securities 40,899 41,867
Available-for-sale securities 3,214 3,429
Mortgage loans held for sale 10,660 8,094
Mortgage loans held for investment, at fair value 3,257,445 3,206,508
Advances to lenders 4,246 3,356
Derivatives assets at fair value 584 458
Guaranty assets and buy-ups 370 356
Total financial assets 3,391,909 3,346,429
Financial liabilities [Abstract]    
Derivative liabilities at fair value 793 777
Guaranty obligations 107 121
Total financial liabilities 3,390,875 3,341,255
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 23,078 24,901
Long-term debt 204,873 212,174
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 3,162,024 $ 3,103,282