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Fair Value Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Carrying Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash $ 80,644 $ 89,036
Federal funds sold and securities purchased under agreements to resell or similar aggrangements 79,350 32,500
Trading securities 52,391 40,695
Available-for-sale securities 60,329 63,181
Mortgage loans held for sale 455 464
Mortgage loans held for investment, at amortized cost 2,958,181 2,948,942
Advances to lenders 4,442 7,592
Derivatives assets at fair value 519 435
Guaranty assets and buy-ups 308 327
Total assets 3,236,619 3,183,172
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 218  
Derivative liabilities at fair value 780 705
Guaranty obligations 565 599
Total financial liabilities 3,234,106 3,190,821
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 80,644 75,786
Federal funds sold and securities purchased under agreements to resell or similar aggrangements 0 0
Trading securities 28,406 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 109,050 93,736
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 0 13,250
Federal funds sold and securities purchased under agreements to resell or similar aggrangements 79,350 32,500
Trading securities 21,233 20,459
Available-for-sale securities 35,878 38,147
Mortgage loans held for sale 272 267
Mortgage loans held for investment, at amortized cost 2,583,989 2,567,022
Advances to lenders 3,810 6,936
Derivatives assets at fair value 14,698 16,051
Guaranty assets and buy-ups 0 0
Total assets 2,739,230 2,694,632
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 218  
Derivative liabilities at fair value 20,529 22,590
Guaranty obligations 0 0
Total financial liabilities 3,367,335 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 aggrangements 0 0
Trading securities 2,752 2,286
Available-for-sale securities 24,451 25,034
Mortgage loans held for sale 196 208
Mortgage loans held for investment, at amortized cost 449,318 466,594
Advances to lenders 578 572
Derivatives assets at fair value 155 175
Guaranty assets and buy-ups 688 692
Total assets 478,138 495,561
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value 162 161
Guaranty obligations 2,730 3,113
Total financial liabilities 22,149 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 aggrangements 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 (14,334) (15,791)
Guaranty assets and buy-ups 0 0
Total assets (14,334) (15,791)
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value (19,911) (22,046)
Guaranty obligations 0 0
Total financial liabilities (19,911) (22,046)
Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 80,644 89,036
Federal funds sold and securities purchased under agreements to resell or similar aggrangements 79,350 32,500
Trading securities 52,391 40,695
Available-for-sale securities 60,329 63,181
Mortgage loans held for sale 468 475
Mortgage loans held for investment, at amortized cost 3,033,307 3,033,616
Advances to lenders 4,388 7,508
Derivatives assets at fair value 519 435
Guaranty assets and buy-ups 688 692
Total assets 3,312,084 3,268,138
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 218  
Derivative liabilities at fair value 780 705
Guaranty obligations 2,730 3,113
Total financial liabilities 3,369,573 3,349,305
Fannie Mae [Member]
   
Financial liabilities [Abstract]    
Long-term debt 770 793
Fannie Mae [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 287,033 305,025
Financial liabilities [Abstract]    
Short-term debt 115,285 105,233
Long-term debt 514,975 510,631
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 35,735 39,018
Financial liabilities [Abstract]    
Short-term debt 115,301 105,253
Long-term debt 536,987 534,516
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 223,862 232,170
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 992 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 259,597 271,188
Financial liabilities [Abstract]    
Short-term debt 115,301 105,253
Long-term debt 537,979 535,572
Consolidated Trusts [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 12,602 10,800
Financial liabilities [Abstract]    
Long-term debt 13,345 11,647
Consolidated Trusts [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 2,671,148 2,643,917
Financial liabilities [Abstract]    
Short-term debt 3,009 3,483
Long-term debt 2,599,274 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 2,548,254 2,528,004
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,694,300 2,685,008
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at amortized cost 225,456 234,424
Financial liabilities [Abstract]    
Short-term debt 3,009 3,483
Long-term debt 15,256 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 2,773,710 2,762,428
Financial liabilities [Abstract]    
Short-term debt 3,009 3,483
Long-term debt $ 2,709,556 $ 2,701,179