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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (4,050) $ (5,186)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (7,728) (10,194)
Derivative assets, gross amount offset (4,050) (5,186)
Derivative liabilities, gross amount offset (7,728) (10,194)
HARP loans [Member]    
Financial liabilities [Abstract]    
Loans Receivable Refinanced under Home Affordable Refinance Program, Fair Value Disclosure 297,500 314,000
Fair Value Estimation Process [Member] | HARP loans [Member]    
Financial liabilities [Abstract]    
Change In Estimated Fair Value Resulting From Change In Principal Market 2,900 3,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 41,551 37,965
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading Securities 23,790 19,466
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 65,341 57,431
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 15,150 16,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,010 30,950
Trading Securities 9,429 9,008
Available-for-sale securities 13,208 15,574
Mortgage loans held for sale 143 169
Mortgage loans held for investment, at fair value 2,676,066 2,687,759
Advances to lenders 5,228 5,079
Derivatives assets at fair value 5,619 6,489
Guaranty assets and buy-ups 0 0
Total financial assets 2,746,853 2,771,628
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase   50
Derivative liabilities at fair value 8,394 10,671
Guaranty obligations 0 0
Total financial liabilities 3,240,390 3,299,289
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 1,645 3,030
Available-for-sale securities 10,953 15,080
Mortgage loans held for sale 4,640 169
Mortgage loans held for investment, at fair value 381,870 400,327
Advances to lenders 429 470
Derivatives assets at fair value 149 182
Guaranty assets and buy-ups 566 616
Total financial assets 400,252 419,874
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase   0
Derivative liabilities at fair value 145 137
Guaranty obligations 1,332 1,579
Total financial liabilities 26,979 23,592
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 56,701 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,010 30,950
Trading Securities 34,864 31,504
Available-for-sale securities 24,161 30,654
Mortgage loans held for sale 4,563 331
Mortgage loans held for investment, at fair value 3,007,615 3,019,163
Advances to lenders 5,670 5,559
Derivatives assets at fair value 1,718 1,485
Guaranty assets and buy-ups 200 210
Total financial assets 3,157,502 3,174,421
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase   50
Derivative liabilities at fair value 811 614
Guaranty obligations 355 382
Total financial liabilities 3,199,735 3,223,201
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 56,701 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 22,010 30,950
Trading Securities 34,864 31,504
Available-for-sale securities 24,161 30,654
Mortgage loans held for sale 4,783 338
Mortgage loans held for investment, at fair value 3,057,936 3,088,086
Advances to lenders 5,657 5,549
Derivatives assets at fair value 1,718 1,485
Guaranty assets and buy-ups 566 616
Total financial assets 3,208,396 3,243,747
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase   50
Derivative liabilities at fair value 811 614
Guaranty obligations 1,332 1,579
Total financial liabilities 3,259,641 3,312,687
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 8,861 6,403
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 28,165 29,896
Financial liabilities [Abstract]    
Short-term debt 81,361 105,022
Long-term debt 354,566 367,703
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 207,356 217,064
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 955 982
Fannie Mae [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 221,148 239,243
Financial liabilities [Abstract]    
Short-term debt 81,338 105,012
Long-term debt 343,747 355,431
Fannie Mae [Member] | Estimated Fair Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 235,521 246,960
Financial liabilities [Abstract]    
Short-term debt 81,361 105,022
Long-term debt 355,521 368,685
Consolidated Trusts [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 14,981 15,629
Financial liabilities [Abstract]    
Long-term debt 22,885 19,483
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 2,647,901 2,657,863
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,796,069 2,815,843
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 174,514 183,263
Financial liabilities [Abstract]    
Short-term debt 1,409 1,560
Long-term debt 23,138 19,334
Consolidated Trusts [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,786,467 2,779,920
Financial liabilities [Abstract]    
Short-term debt 1,409 1,560
Long-term debt 2,772,075 2,760,152
Consolidated Trusts [Member] | Estimated Fair Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,822,415 2,841,126
Financial liabilities [Abstract]    
Short-term debt 1,409 1,560
Long-term debt $ 2,819,207 $ 2,835,177