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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (4,034) $ (4,514)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (4,877) (6,844)
Mortgage loans held for investment, at fair value 11,013 12,057
Derivative assets, gross amount offset (4,034) (4,514)
Derivative liabilities, gross amount offset (4,877) (6,844)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 35,301 41,477
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 30,799 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 66,100 73,794
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
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 16,750 20,700
Federal funds sold and securities purchased under agreements to resell or similar arrangements 23,740 30,415
Trading securities 3,947 7,118
Available-for-sale securities 4,468 6,210
Mortgage loans held for sale 2,389 509
Mortgage loans held for investment, at fair value 2,869,318 2,767,813
Advances to lenders 4,769 7,156
Derivatives assets at fair value 4,152 5,019
Guaranty assets and buy-ups 0 0
Total financial assets 2,929,533 2,844,940
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 81  
Derivative liabilities at fair value 5,173 7,921
Guaranty obligations 0 0
Total financial liabilities 3,299,024 3,243,215
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 2,140 1,127
Available-for-sale securities 1,495 2,153
Mortgage loans held for sale 2,780 2,751
Mortgage loans held for investment, at fair value 318,453 316,742
Advances to lenders 2 352
Derivatives assets at fair value 166 182
Guaranty assets and buy-ups 444 432
Total financial assets 325,480 323,739
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value 41 138
Guaranty obligations 489 710
Total financial liabilities 41,887 38,870
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 8,491 9,582
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 33,334 34,998
Long-term debt 265,390 298,980
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 824 770
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 32,760 36,524
Consolidated Trusts [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
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,995,046 2,901,316
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 458 584
Long-term debt 40,075 36,668
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,051 62,177
Federal funds sold and securities purchased under agreements to resell or similar arrangements 23,740 30,415
Trading securities 36,886 40,562
Available-for-sale securities 5,963 8,363
Mortgage loans held for sale 4,516 2,899
Mortgage loans held for investment, at fair value 3,148,243 3,076,854
Advances to lenders 4,771 7,494
Derivatives assets at fair value 284 687
Guaranty assets and buy-ups 155 158
Total financial assets 3,276,609 3,229,609
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 81  
Derivative liabilities at fair value 337 1,215
Guaranty obligations 267 280
Total financial liabilities 3,309,268 3,263,811
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 33,332 34,995
Long-term debt 257,957 292,102
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 459 584
Long-term debt 3,016,835 2,934,635
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,051 62,177
Federal funds sold and securities purchased under agreements to resell or similar arrangements 23,740 30,415
Trading securities 36,886 40,562
Available-for-sale securities 5,963 8,363
Mortgage loans held for sale 5,169 3,260
Mortgage loans held for investment, at fair value 3,187,771 3,084,555
Advances to lenders 4,771 7,508
Derivatives assets at fair value 284 687
Guaranty assets and buy-ups 444 432
Total financial assets 3,317,079 3,237,959
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 81  
Derivative liabilities at fair value 337 1,215
Guaranty obligations 489 710
Total financial liabilities 3,336,034 3,275,241
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 33,334 34,998
Long-term debt 266,214 299,750
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 458 584
Long-term debt $ 3,035,121 $ 2,937,984