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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (7,530) $ (4,024)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (14,269) (8,650)
Mortgage loans held for investment, at fair value 13,413 14,075
Derivative assets, gross amount offset (7,530) (4,024)
Derivative liabilities, gross amount offset (14,269) (8,650)
Fair Value Estimation Process [Member] | Home Affordable Refinance Program (HARP) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 270,900 282,000
Financial liabilities [Abstract]    
Change In Estimated Fair Value Resulting From Change In Principal Market 256 1,100
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 42,196 34,953
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 29,652 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 71,848 64,438
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0 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 19,120 10,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,325 27,350
Trading securities 9,019 9,025
Available-for-sale securities 10,352 11,799
Mortgage loans held for sale 401 157
Mortgage loans held for investment, at fair value 2,705,804 2,702,526
Advances to lenders 4,915 3,902
Derivatives assets at fair value 8,048 4,729
Guaranty assets and buy-ups 0 0
Total financial assets 2,779,984 2,770,088
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 115 62
Derivative liabilities at fair value 15,395 9,042
Guaranty obligations 0 0
Total financial liabilities 3,292,266 3,224,091
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 496 1,398
Available-for-sale securities 2,828 8,431
Mortgage loans held for sale 4,268 5,541
Mortgage loans held for investment, at fair value 415,125 351,355
Advances to lenders 365 394
Derivatives assets at fair value 257 189
Guaranty assets and buy-ups 454 544
Total financial assets 423,793 367,852
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0 0
Derivative liabilities at fair value 9 32
Guaranty obligations 890 1,012
Total financial liabilities 42,660 30,061
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 10,650 11,133
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 29,508 26,544
Financial liabilities [Abstract]    
Short-term debt 60,520 71,006
Long-term debt 315,023 324,248
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 183,942 193,670
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 881 898
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 32,798 23,609
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,676,296 2,675,982
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,901,213 2,819,733
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 231,183 157,685
Financial liabilities [Abstract]    
Short-term debt 742 944
Long-term debt 40,138 27,175
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 61,316 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,325 27,350
Trading securities 39,167 39,908
Available-for-sale securities 13,180 20,230
Mortgage loans held for sale 4,277 5,361
Mortgage loans held for investment, at fair value 3,025,592 3,014,283
Advances to lenders 5,288 4,308
Derivatives assets at fair value 775 894
Guaranty assets and buy-ups 141 184
Total financial assets 3,172,061 3,158,071
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 115 62
Derivative liabilities at fair value 1,135 424
Guaranty obligations 276 329
Total financial liabilities 3,213,430 3,198,486
Carrying Value [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 201,243 206,544
Financial liabilities [Abstract]    
Short-term debt 60,495 71,007
Long-term debt 301,923 315,128
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,824,349 2,807,739
Financial liabilities [Abstract]    
Short-term debt 742 943
Long-term debt 2,848,744 2,810,593
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 61,316 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,325 27,350
Trading securities 39,167 39,908
Available-for-sale securities 13,180 20,230
Mortgage loans held for sale 4,669 5,698
Mortgage loans held for investment, at fair value 3,120,929 3,053,881
Advances to lenders 5,280 4,296
Derivatives assets at fair value 775 894
Guaranty assets and buy-ups 454 544
Total financial assets 3,268,095 3,198,354
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 115 62
Derivative liabilities at fair value 1,135 424
Guaranty obligations 890 1,012
Total financial liabilities 3,320,657 3,245,502
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 213,450 220,214
Financial liabilities [Abstract]    
Short-term debt 60,520 71,006
Long-term debt 315,904 325,146
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,907,479 2,833,667
Financial liabilities [Abstract]    
Short-term debt 742 944
Long-term debt $ 2,941,351 $ 2,846,908