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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (6,724) $ (4,024)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (12,598) (8,650)
Mortgage loans held for investment, at fair value 13,714 14,075
Derivative assets, gross amount offset (6,724) (4,024)
Derivative liabilities, gross amount offset (12,598) (8,650)
Fair Value Estimation Process [Member] | Home Affordable Refinance Program (HARP) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 279,000 282,000
Financial liabilities [Abstract]    
Change In Estimated Fair Value Resulting From Change In Principal Market 1,000 1,100
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 37,889 34,953
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading Securities 30,746 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 68,635 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 14,900 10,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 17,550 27,350
Trading Securities 8,577 9,025
Available-for-sale securities 13,362 11,799
Mortgage loans held for sale 150 157
Mortgage loans held for investment, at fair value 2,687,650 2,702,526
Advances to lenders 4,333 3,902
Derivatives assets at fair value 7,185 4,729
Guaranty assets and buy-ups 0 0
Total financial assets 2,753,707 2,770,088
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 26 62
Derivative liabilities at fair value 13,706 9,042
Guaranty obligations 0 0
Total financial liabilities 3,269,781 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 677 1,398
Available-for-sale securities 3,621 8,431
Mortgage loans held for sale 4,864 5,541
Mortgage loans held for investment, at fair value 411,028 351,355
Advances to lenders 379 394
Derivatives assets at fair value 239 189
Guaranty assets and buy-ups 513 544
Total financial assets 421,321 367,852
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0 0
Derivative liabilities at fair value 8 32
Guaranty obligations 998 1,012
Total financial liabilities 33,843 30,061
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 10,901 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 26,826 26,544
Financial liabilities [Abstract]    
Short-term debt 60,433 71,006
Long-term debt 322,565 324,248
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 190,363 193,670
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 903 898
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 28,563 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 2,660,824 2,675,982
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,873,051 2,819,733
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 220,665 157,685
Financial liabilities [Abstract]    
Short-term debt 822 944
Long-term debt 31,112 27,175
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,789 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 17,550 27,350
Trading Securities 40,000 39,908
Available-for-sale securities 16,983 20,230
Mortgage loans held for sale 4,639 5,361
Mortgage loans held for investment, at fair value 3,020,308 3,014,283
Advances to lenders 4,722 4,308
Derivatives assets at fair value 700 894
Guaranty assets and buy-ups 176 184
Total financial assets 3,157,867 3,158,071
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 26 62
Derivative liabilities at fair value 1,116 424
Guaranty obligations 320 329
Total financial liabilities 3,201,232 3,198,486
Carrying Value [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 204,130 206,544
Financial liabilities [Abstract]    
Short-term debt 60,417 71,007
Long-term debt 310,402 315,128
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,816,178 2,807,739
Financial liabilities [Abstract]    
Short-term debt 822 943
Long-term debt 2,828,129 2,810,593
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 52,789 45,553
Federal funds sold and securities purchased under agreements to resell or similar arrangements 17,550 27,350
Trading Securities 40,000 39,908
Available-for-sale securities 16,983 20,230
Mortgage loans held for sale 5,014 5,698
Mortgage loans held for investment, at fair value 3,098,678 3,053,881
Advances to lenders 4,712 4,296
Derivatives assets at fair value 700 894
Guaranty assets and buy-ups 513 544
Total financial assets 3,236,939 3,198,354
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 26 62
Derivative liabilities at fair value 1,116 424
Guaranty obligations 998 1,012
Total financial liabilities 3,291,026 3,245,502
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 217,189 220,214
Financial liabilities [Abstract]    
Short-term debt 60,433 71,006
Long-term debt 323,468 325,146
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,881,489 2,833,667
Financial liabilities [Abstract]    
Short-term debt 822 944
Long-term debt $ 2,904,163 $ 2,846,908