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Fair Value Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Carrying Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash $ 78,648 $ 89,036
Federal funds sold and securities purchased under agreements to resell or similar arrangements 37,800 32,500
Trading securities 40,189 40,695
Available-for-sale securities 55,536 63,181
Mortgage loans held for sale 545 464
Mortgage loans held for investment, at amortized cost 2,975,509 2,948,942
Advances to lenders 5,906 7,592
Derivatives assets at fair value 3,449 435
Guaranty assets and buy-ups 275 327
Total assets 3,197,857 3,183,172
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,904 705
Guaranty obligations 520 599
Total financial liabilities 3,243,959 3,190,821
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 67,648 75,786
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 18,477 17,950
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at amortized cost 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total assets 86,125 93,736
Financial liabilities [Abstract]    
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 11,000 13,250
Federal funds sold and securities purchased under agreements to resell or similar arrangements 37,800 32,500
Trading securities 18,753 20,459
Available-for-sale securities 31,196 38,147
Mortgage loans held for sale 286 267
Mortgage loans held for investment, at amortized cost 2,584,593 2,567,022
Advances to lenders 5,298 6,936
Derivatives assets at fair value 15,417 16,051
Guaranty assets and buy-ups 0 0
Total assets 2,704,343 2,694,632
Financial liabilities [Abstract]    
Derivative liabilities at fair value 18,535 22,590
Guaranty obligations 0 0
Total financial liabilities 3,280,283 3,347,367
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 2,959 2,286
Available-for-sale securities 24,340 25,034
Mortgage loans held for sale 267 208
Mortgage loans held for investment, at amortized cost 406,415 466,594
Advances to lenders 580 572
Derivatives assets at fair value 105 175
Guaranty assets and buy-ups 660 692
Total assets 435,326 495,561
Financial liabilities [Abstract]    
Derivative liabilities at fair value 154 161
Guaranty obligations 2,365 3,113
Total financial liabilities 20,829 23,984
Netting Adjustment [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 0 0
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at amortized cost 0 0
Advances to lenders 0 0
Derivatives assets at fair value (12,073) (15,791)
Guaranty assets and buy-ups 0 0
Total assets (12,073) (15,791)
Financial liabilities [Abstract]    
Derivative liabilities at fair value (15,785) (22,046)
Guaranty obligations 0 0
Total financial liabilities (15,785) (22,046)
Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 78,648 89,036
Federal funds sold and securities purchased under agreements to resell or similar arrangements 37,800 32,500
Trading securities 40,189 40,695
Available-for-sale securities 55,536 63,181
Mortgage loans held for sale 553 475
Mortgage loans held for investment, at amortized cost 2,991,008 3,033,616
Advances to lenders 5,878 7,508
Derivatives assets at fair value 3,449 435
Guaranty assets and buy-ups 660 692
Total assets 3,213,721 3,268,138
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,904 705
Guaranty obligations 2,365 3,113
Total financial liabilities 3,285,327 3,349,305
Fannie Mae [Member]
   
Financial liabilities [Abstract]    
Long-term debt 720 793
Fannie Mae [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 283,748 305,025
Financial liabilities [Abstract]    
Short-term debt 102,799 105,233
Long-term debt 500,441 510,631
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 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 amortized cost 38,280 39,018
Financial liabilities [Abstract]    
Short-term debt 102,813 105,253
Long-term debt 512,058 534,516
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 225,059 232,170
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 944 1,056
Fannie Mae [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 263,339 271,188
Financial liabilities [Abstract]    
Short-term debt 102,813 105,253
Long-term debt 513,002 535,572
Consolidated Trusts [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 13,770 10,800
Financial liabilities [Abstract]    
Long-term debt 14,601 11,647
Consolidated Trusts [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 2,691,761 2,643,917
Financial liabilities [Abstract]    
Short-term debt 2,812 3,483
Long-term debt 2,634,483 2,570,170
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 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 amortized cost 2,546,313 2,528,004
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,646,877 2,685,008
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 181,356 234,424
Financial liabilities [Abstract]    
Short-term debt 2,812 3,483
Long-term debt 14,554 16,171
Consolidated Trusts [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Consolidated Trusts [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 2,727,669 2,762,428
Financial liabilities [Abstract]    
Short-term debt 2,812 3,483
Long-term debt $ 2,661,431 $ 2,701,179