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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (2,775) $ (4,272)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,648) (4,979)
Mortgage loans held for investment, at fair value 9,153 10,596
Derivative assets, gross amount offset (2,775) (4,272)
Derivative liabilities, gross amount offset (2,648) (4,979)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 32,982 35,060
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 37,328 29,222
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 70,310 64,282
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 18,049 25,200
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,598 19,470
Trading securities 6,496 4,256
Available-for-sale securities 2,501 3,530
Mortgage loans held for sale 1,660 101
Mortgage loans held for investment, at fair value 2,935,066 2,886,470
Advances to lenders 4,020 4,936
Derivatives assets at fair value 3,010 4,274
Guaranty assets and buy-ups 0 0
Total financial assets 2,997,400 2,948,237
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 749  
Derivative liabilities at fair value 2,904 5,272
Guaranty obligations 0 0
Total financial liabilities 3,243,274 3,302,681
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 77 1,201
Available-for-sale securities 1,036 1,313
Mortgage loans held for sale 9,527 5,333
Mortgage loans held for investment, at fair value 210,018 315,719
Advances to lenders 2 2
Derivatives assets at fair value 118 169
Guaranty assets and buy-ups 368 436
Total financial assets 221,146 324,173
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value 20 35
Guaranty obligations 117 456
Total financial liabilities 40,628 42,389
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 7,251 8,186
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 28,251 33,379
Long-term debt 221,671 249,780
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 771 837
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 24,948 30,493
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 2,989,699 3,014,250
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 273 378
Long-term debt 39,447 40,683
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 51,031 60,260
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,598 19,470
Trading securities 43,901 34,679
Available-for-sale securities 3,537 4,843
Mortgage loans held for sale 10,572 4,988
Mortgage loans held for investment, at fair value 3,222,562 3,173,537
Advances to lenders 4,022 4,938
Derivatives assets at fair value 353 171
Guaranty assets and buy-ups 149 149
Total financial assets 3,362,725 3,303,035
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 749  
Derivative liabilities at fair value 276 328
Guaranty obligations 162 258
Total financial liabilities 3,375,557 3,330,640
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 28,248 33,377
Long-term debt 218,434 243,375
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 274 379
Long-term debt 3,127,414 3,052,923
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 51,031 60,260
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,598 19,470
Trading securities 43,901 34,679
Available-for-sale securities 3,537 4,843
Mortgage loans held for sale 11,187 5,434
Mortgage loans held for investment, at fair value 3,145,084 3,202,189
Advances to lenders 4,022 4,938
Derivatives assets at fair value 353 171
Guaranty assets and buy-ups 368 436
Total financial assets 3,286,081 3,332,420
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 749  
Derivative liabilities at fair value 276 328
Guaranty obligations 117 456
Total financial liabilities 3,281,254 3,340,091
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 28,251 33,379
Long-term debt 222,442 250,617
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 273 378
Long-term debt $ 3,029,146 $ 3,054,933