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Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2013
Concentration Risk [Line Items]  
Estimated Benefit from Mortgage Insurers [Table Text Block]
The following table displays the amount by which our estimated benefit from mortgage insurance as of December 31, 2013 and 2012 reduced our total loss reserves as of these dates.
 
As of December 31,
 
2013
 
2012
 
(Dollars in millions)
Contractual mortgage insurance benefit
 
$
6,751

 
 
 
$
9,993

 
Less: Collectibility adjustment(1)
 
431

 
 
 
708

 
Estimated benefit included in total loss reserves
 
$
6,320

 
 
 
$
9,285

 
__________
(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 guaranty book of business as of December 31, 2013 and 2012.
 
Geographic Concentration(1)
 
Percentage of Single-Family Conventional Guaranty Book of Business(2)
 
Percentage of Multifamily Guaranty Book of Business(3)
 
As of December 31,
 
As of December 31,
 
2013
 
2012
 
2013
 
2012
Midwest
 
15
%
 
 
15
%
 
 
9
%
 
 
8
%
Northeast
 
19
 
 
 
19
 
 
 
20
 
 
 
21
 
Southeast
 
22
 
 
 
23
 
 
 
21
 
 
 
21
 
Southwest
 
16
 
 
 
16
 
 
 
19
 
 
 
18
 
West
 
28
 
 
 
27
 
 
 
31
 
 
 
32
 
Total
 
100
%
 
 
100
%
 
 
100
%
 
 
100
%
__________
(1) 
Midwest consists of IL, IN, IA, MI, MN, NE, ND, OH, SD, WI; Northeast consists of CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT, VI; Southeast consists of AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA, WV; Southwest consists of AZ, AR, CO, KS, LA, MO, NM, OK, TX, UT; West consists of 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, 2013 and 2012.
(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, 2013 and 2012.
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 retained mortgage portfolio as of December 31, 2013 and 2012.
 
As of December 31,
 
2013
 
2012
 
(Dollars in millions)
Alt-A private-label securities
$
511

 
$
928

Subprime private-label securities
868

 
1,264

Mortgage revenue bonds
3,911

 
4,374

Other mortgage-related securities
264

 
292

Total
$
5,554

 
$
6,858