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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Netting adjustment $ (4,272) $ (4,514)
Financial liabilities [Abstract]    
Netting adjustment (4,979) (6,844)
Mortgage loans held for investment, at fair value 10,596 12,057
Netting adjustment (4,272) (4,514)
Netting adjustment (4,979) (6,844)
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 8,186 9,582
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 30,493 36,524
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 35,060 41,477
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 29,222 32,317
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 64,282 73,794
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 25,200 20,700
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,470 30,415
Trading securities 4,256 7,118
Available-for-sale securities 3,530 6,210
Mortgage loans held for sale 101 509
Mortgage loans held for investment, at fair value 2,886,470 2,767,813
Advances to lenders 4,936 7,156
Derivatives assets at fair value 4,274 5,019
Guaranty assets and buy-ups 0 0
Total financial assets 2,948,237 2,844,940
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 5,272 7,921
Guaranty obligations 0 0
Total financial liabilities 3,302,681 3,243,215
Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 33,379 34,998
Long-term debt 249,780 298,980
Significant Other Observable Inputs (Level 2) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 3,014,250 2,901,316
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 1,201 1,127
Available-for-sale securities 1,313 2,153
Mortgage loans held for sale 5,333 2,751
Mortgage loans held for investment, at fair value 315,719 316,742
Advances to lenders 2 352
Derivatives assets at fair value 169 182
Guaranty assets and buy-ups 436 432
Total financial assets 324,173 323,739
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 35 138
Guaranty obligations 456 710
Total financial liabilities 42,389 38,870
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 837 770
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 378 584
Long-term debt 40,683 36,668
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 60,260 62,177
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,470 30,415
Trading securities 34,679 40,562
Available-for-sale securities 4,843 8,363
Mortgage loans held for sale 4,988 2,899
Mortgage loans held for investment, at fair value 3,173,537 3,076,854
Advances to lenders 4,938 7,494
Derivatives assets at fair value 171 687
Guaranty assets and buy-ups 149 158
Total financial assets 3,303,035 3,229,609
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 328 1,215
Guaranty obligations 258 280
Total financial liabilities 3,330,640 3,263,811
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 33,377 34,995
Long-term debt 243,375 292,102
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 379 584
Long-term debt 3,052,923 2,934,635
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 60,260 62,177
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,470 30,415
Trading securities 34,679 40,562
Available-for-sale securities 4,843 8,363
Mortgage loans held for sale 5,434 3,260
Mortgage loans held for investment, at fair value 3,202,189 3,084,555
Advances to lenders 4,938 7,508
Derivatives assets at fair value 171 687
Guaranty assets and buy-ups 436 432
Total financial assets 3,332,420 3,237,959
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 328 1,215
Guaranty obligations 456 710
Total financial liabilities 3,340,091 3,275,241
Estimate of Fair Value Measurement [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 33,379 34,998
Long-term debt 250,617 299,750
Estimate of Fair Value Measurement [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 378 584
Long-term debt $ 3,054,933 $ 2,937,984