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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (4,417) $ (5,186)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (10,635) (10,194)
Mortgage loans held for investment, at fair value 14,605 15,629
Derivative assets, gross amount offset (4,417) (5,186)
Derivative liabilities, gross amount offset (10,635) (10,194)
HARP loans [Member]    
Financial liabilities [Abstract]    
Loans Receivable Refinanced under Home Affordable Refinance Program, Fair Value Disclosure 292,000 314,000
Fair Value Estimation Process [Member] | HARP loans [Member]    
Financial liabilities [Abstract]    
Change In Estimated Fair Value Resulting From Change In Principal Market 1,400 3,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 34,696 37,965
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading Securities 26,961 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 61,657 57,431
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 15,500 16,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,600 30,950
Trading Securities 9,458 9,008
Available-for-sale securities 12,455 15,574
Mortgage loans held for sale 178 169
Mortgage loans held for investment, at fair value 2,701,802 2,687,759
Advances to lenders 4,829 5,079
Derivatives assets at fair value 5,830 6,489
Guaranty assets and buy-ups 0 0
Total financial assets 2,776,652 2,771,628
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 118 50
Derivative liabilities at fair value 11,402 10,671
Guaranty obligations 0 0
Total financial liabilities 3,268,718 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 1,590 3,030
Available-for-sale securities 9,552 15,080
Mortgage loans held for sale 3,796 169
Mortgage loans held for investment, at fair value 386,291 400,327
Advances to lenders 412 470
Derivatives assets at fair value 197 182
Guaranty assets and buy-ups 527 616
Total financial assets 402,365 419,874
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0 0
Derivative liabilities at fair value 137 137
Guaranty obligations 1,342 1,579
Total financial liabilities 30,414 23,592
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 50,196 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,600 30,950
Trading Securities 38,009 31,504
Available-for-sale securities 22,007 30,654
Mortgage loans held for sale 3,716 331
Mortgage loans held for investment, at fair value 3,016,740 3,019,163
Advances to lenders 5,253 5,559
Derivatives assets at fair value 1,610 1,485
Guaranty assets and buy-ups 189 210
Total financial assets 3,164,320 3,174,421
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 118 50
Derivative liabilities at fair value 904 614
Guaranty obligations 338 382
Total financial liabilities 3,207,605 3,223,201
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 50,196 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 26,600 30,950
Trading Securities 38,009 31,504
Available-for-sale securities 22,007 30,654
Mortgage loans held for sale 3,974 338
Mortgage loans held for investment, at fair value 3,088,093 3,088,086
Advances to lenders 5,241 5,549
Derivatives assets at fair value 1,610 1,485
Guaranty assets and buy-ups 527 616
Total financial assets 3,236,257 3,243,747
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 118 50
Derivative liabilities at fair value 904 614
Guaranty obligations 1,342 1,579
Total financial liabilities 3,288,497 3,312,687
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 9,975 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 26,358 29,896
Financial liabilities [Abstract]    
Short-term debt 95,458 105,022
Long-term debt 334,007 367,703
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 201,369 217,064
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 931 982
Fannie Mae [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 213,639 239,243
Financial liabilities [Abstract]    
Short-term debt 95,427 105,012
Long-term debt 322,031 355,431
Fannie Mae [Member] | Estimated Fair Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 227,727 246,960
Financial liabilities [Abstract]    
Short-term debt 95,458 105,022
Long-term debt 334,938 368,685
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 23,143 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 2,675,444 2,657,863
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,827,733 2,815,843
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 184,922 183,263
Financial liabilities [Abstract]    
Short-term debt 1,391 1,560
Long-term debt 26,613 19,334
Consolidated Trusts [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,803,101 2,779,920
Financial liabilities [Abstract]    
Short-term debt 1,391 1,560
Long-term debt 2,787,396 2,760,152
Consolidated Trusts [Member] | Estimated Fair Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,860,366 2,841,126
Financial liabilities [Abstract]    
Short-term debt 1,391 1,560
Long-term debt $ 2,854,346 $ 2,835,177