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adversely impact our business, financial condition, earnings and cash flow, including model, legal and reputational risks that may arise due to a failure to comply with laws, regulations or ethical standards and codes of conduct applicable to our business activities and functions.
In this section we provide an update on our management of our major risk categories. For a more complete discussion of the financial risks we face and how we manage credit risk, market risk and operational risk, see “MD&A—Risk Management” in our 2010 Form 10-K and “Risk Factors” in our 2010 Form 10-K and in this report.
Credit Risk Management
We are generally subject to two types of credit risk: mortgage credit risk and institutional counterparty credit risk. Continuing adverse market conditions have resulted in significant exposure to mortgage and institutional counterparty credit risk. The metrics used to measure credit risk are generated using internal models. Our internal models require numerous assumptions and there are inherent limitations in any methodology used to estimate macroeconomic factors such as home prices, unemployment and interest rates and their impact on borrower behavior. When market conditions change rapidly and dramatically, the assumptions of our models may no longer accurately capture or reflect the changing conditions. On a continuous basis, management makes judgments about the appropriateness of the risk assessments indicated by the models. See “Risk Factors” in our 2010 Form 10-K for a discussion of the risks associated with our use of models.
Mortgage Credit Risk Management
Mortgage credit risk is the risk that a borrower will fail to make required mortgage payments. We are exposed to credit risk on our mortgage credit book of business because we either hold mortgage assets, have issued a guaranty in connection with the creation of Fannie Mae MBS backed by mortgage assets or provided other credit enhancements on mortgage assets. While our mortgage credit book of business includes all of our mortgage-related assets, both on- and off-balance sheet, our guaranty book of business excludes non-Fannie Mae mortgage-related securities held in our portfolio for which we do not provide a guaranty.
Mortgage Credit Book of Business
Table 34 displays the composition of our entire mortgage credit book of business as of the periods indicated. Our total single-family mortgage credit book of business accounted for 93% of our total mortgage credit book of business as of both June 30, 2011 and December 31, 2010.
Table 34:  Composition of Mortgage Credit Book of Business(1)
    As of June 30, 2011     As of December 31, 2010  
    Single-Family     Multifamily     Total     Single-Family     Multifamily     Total  
    (Dollars in millions)  
Mortgage loans and Fannie Mae MBS(2)
  $ 2,855,481     $ 174,602     $ 3,030,083     $ 2,846,462     $ 172,407     $ 3,018,869  
Other credit guarantees(3)
    20,025       16,853       36,878       18,625       16,994       35,619  
Guaranty book of business
  $ 2,875,506     $ 191,455     $ 3,066,961     $ 2,865,087     $ 189,401     $ 3,054,488  
Agency mortgage-related securities(4)
    16,046       33       16,079       18,797       24       18,821  
Other mortgage-related securities
    45,989       33,139       79,128       48,678       34,205       82,883  
Mortgage credit book of business
  $ 2,937,541     $ 224,627     $ 3,162,168     $ 2,932,562     $ 223,630     $ 3,156,192  
Guaranty Book of Business Detail:
Conventional Guaranty Book of Business(5)
  $ 2,801,371     $ 188,868     $ 2,990,239     $ 2,790,590     $ 186,712     $ 2,977,302  
Government Guaranty Book of Business(6)
  $ 74,135     $ 2,587     $ 76,722     $ 74,497     $ 2,689     $ 77,186  
(1) Based on unpaid principal balance. Prior period amounts have been reclassified to conform to the current period presentation.