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Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2012
Risks and Uncertainties [Abstract]  
Estimated Benefit from Mortgage Insurers [Table Text Block]
The following table displays our estimated benefit from mortgage insurers as of December 31, 2012 and 2011 that reduces our total loss reserves.
 
 
As of December 31,
 
 
2012
 
2011
 
 
(Dollars in millions)
 
Contractual mortgage insurance benefit
 
$
9,993

 
 
 
$
15,099

 
Less: Collectibility adjustment(1)
 
708

 
 
 
2,867

 
Estimated benefit included in total loss reserves
 
$
9,285

 
 
 
$
12,232

 
__________
(1) 
Represents an adjustment that reduces the contractual benefit for our assessment of our mortgage insurer counterparties’ inability to fully pay the contractual mortgage insurance claims.
Geographic Concentration Risk [Member]
  
Concentration Risk [Line Items]  
Concentration Risk [Table Text Block]
The following table displays the regional geographic concentration of single-family and multifamily loans in our mortgage portfolio and those loans held or securitized in Fannie Mae MBS as of December 31, 2012 and 2011.
 
Geographic Concentration(1)
 
Percentage of Conventional Single-Family Guaranty Book of Business(2)
 
Percentage of Multifamily Guaranty Book of Business(3)
 
As of December 31,
 
As of December 31,
 
2012
 
2011
 
2012
 
2011
Midwest
 
15
%
 
 
15
%
 
 
8
%
 
 
8
%
Northeast
 
19
 
 
 
19
 
 
 
21
 
 
 
21
 
Southeast
 
23
 
 
 
24
 
 
 
21
 
 
 
20
 
Southwest
 
16
 
 
 
15
 
 
 
18
 
 
 
17
 
West
 
27
 
 
 
27
 
 
 
32
 
 
 
34
 
Total
 
100
%
 
 
100
%
 
 
100
%
 
 
100
%
__________
(1) 
Midwest includes IL, IN, IA, MI, MN, NE, ND, OH, SD, WI; Northeast includes CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT, VI; Southeast includes AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA, WV; Southwest includes AZ, AR, CO, KS, LA, MO, NM, OK, TX, UT; West includes AK, CA, GU, HI, ID, MT, NV, OR, WA and WY.
(2) 
Consists of the portion of our single-family conventional guaranty book of business for which we have detailed loan level information, which constituted over 99% of our total single-family conventional guaranty book of business as of December 31, 2012 and 2011.
(3) 
Consists of the portion of our multifamily guaranty book of business for which we have detailed loan level information, which constituted 99% of our total multifamily guaranty book of business as of December 31, 2012 and 2011.
Guaranteed Non-Agency Securities [Member]
  
Concentration Risk [Line Items]  
Concentration Risk [Table Text Block]
The following table displays the total unpaid principal balance of guaranteed non-agency securities in our portfolio as of December 31, 2012 and 2011.
 
As of December 31,
 
2012
 
2011
 
(Dollars in millions)
Alt-A private-label securities
$
928

 
$
1,279

Subprime private-label securities
1,264

 
1,398

Mortgage revenue bonds
4,374

 
4,931

Other mortgage-related securities
292

 
317

Non mortgage-related securities
—

 
46

Total
$
6,858

 
$
7,971