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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Netting adjustment $ (4,514) $ (4,024)
Financial liabilities [Abstract]    
Netting adjustment (6,844) (8,650)
Mortgage loans held for investment, at fair value 12,057 14,075
Netting adjustment (4,514) (4,024)
Netting adjustment (6,844) (8,650)
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 9,582 11,133
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 36,524 23,609
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 41,477 34,953
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 32,317 29,485
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 73,794 64,438
Financial liabilities [Abstract]    
Federal funds purchased and securities loaned or sold under agreements to repurchase, fair value disclosure   0
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 assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
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 assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
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 20,700 10,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 30,415 27,350
Trading securities 7,118 9,025
Available-for-sale securities 6,210 11,799
Mortgage loans held for sale 509 157
Mortgage loans held for investment, at fair value 2,767,813 2,702,526
Advances to lenders 7,156 3,902
Derivatives assets at fair value 5,019 4,729
Guaranty assets and buy-ups 0 0
Total financial assets 2,844,940 2,770,088
Financial liabilities [Abstract]    
Federal funds purchased and securities loaned or sold under agreements to repurchase, fair value disclosure   62
Derivatives liabilities at fair value 7,921 9,042
Guaranty obligations 0 0
Total financial liabilities 3,243,215 3,224,091
Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 36,194 26,544
Financial liabilities [Abstract]    
Short-term debt 34,998 71,006
Long-term debt 298,980 324,248
Significant Other Observable Inputs (Level 2) [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,731,619 2,675,982
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,901,316 2,819,733
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 1,127 1,398
Available-for-sale securities 2,153 8,431
Mortgage loans held for sale 2,751 5,541
Mortgage loans held for investment, at fair value 316,742 351,355
Advances to lenders 352 394
Derivatives assets at fair value 182 189
Guaranty assets and buy-ups 432 544
Total financial assets 323,739 367,852
Financial liabilities [Abstract]    
Federal funds purchased and securities loaned or sold under agreements to repurchase, fair value disclosure   0
Derivatives liabilities at fair value 138 32
Guaranty obligations 710 1,012
Total financial liabilities 38,870 30,061
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 157,469 193,670
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 770 898
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 159,273 157,685
Financial liabilities [Abstract]    
Short-term debt 584 944
Long-term debt 36,668 27,175
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 62,177 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 30,415 27,350
Trading securities 40,562 39,908
Available-for-sale securities 8,363 20,230
Mortgage loans held for sale 2,899 5,361
Mortgage loans held for investment, at fair value 3,076,854 3,014,283
Advances to lenders 7,494 4,308
Derivatives assets at fair value 687 894
Guaranty assets and buy-ups 158 184
Total financial assets 3,229,609 3,158,071
Financial liabilities [Abstract]    
Federal funds purchased and securities loaned or sold under agreements to repurchase, fair value disclosure   62
Derivatives liabilities at fair value 1,215 424
Guaranty obligations 280 329
Total financial liabilities 3,263,811 3,198,486
Carrying Value [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 181,738 206,544
Financial liabilities [Abstract]    
Short-term debt 34,995 71,007
Long-term debt 292,102 315,128
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,895,116 2,807,739
Financial liabilities [Abstract]    
Short-term debt 584 943
Long-term debt 2,934,635 2,810,593
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 62,177 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 30,415 27,350
Trading securities 40,562 39,908
Available-for-sale securities 8,363 20,230
Mortgage loans held for sale 3,260 5,698
Mortgage loans held for investment, at fair value 3,084,555 3,053,881
Advances to lenders 7,508 4,296
Derivatives assets at fair value 687 894
Guaranty assets and buy-ups 432 544
Total financial assets 3,237,959 3,198,354
Financial liabilities [Abstract]    
Federal funds purchased and securities loaned or sold under agreements to repurchase, fair value disclosure   62
Derivatives liabilities at fair value 1,215 424
Guaranty obligations 710 1,012
Total financial liabilities 3,275,241 3,245,502
Estimate of Fair Value Measurement [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 193,663 220,214
Financial liabilities [Abstract]    
Short-term debt 34,998 71,006
Long-term debt 299,750 325,146
Estimate of Fair Value Measurement [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,890,892 2,833,667
Financial liabilities [Abstract]    
Short-term debt 584 944
Long-term debt $ 2,937,984 $ 2,846,908