Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2012
Notes to Consolidated Financial Statements [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Organization We are a stockholder-owned corporation organized and existing under the Federal National Mortgage Association Charter Act (the "Charter Act" or our "charter"). We are a government-sponsored enterprise ("GSE"), and we are subject to government oversight and regulation. Our regulators include the Federal Housing Finance Agency ("FHFA"), the U.S. Department of Housing and Urban Development ("HUD"), the U.S. Securities and Exchange Commission ("SEC"), and the U.S. Department of the Treasury ("Treasury"). The U.S. government does not guarantee our securities or other obligations. Conservatorship On September 7, 2008, the Secretary of the Treasury and the Director of FHFA announced several actions taken by Treasury and FHFA regarding Fannie Mae, which included: (1) placing us in conservatorship and (2) the execution of a senior preferred stock purchase agreement by our conservator, on our behalf, and Treasury, pursuant to which we issued to Treasury both senior preferred stock and a warrant to purchase common stock. Under the Federal Housing Enterprises Financial Safety and Soundness Act of 1992, as amended by the Federal Housing Finance Regulatory Reform Act of 2008, (together, the “GSE Act”), the conservator immediately succeeded to (1) all rights, titles, powers and privileges of Fannie Mae, and of any stockholder, officer or director of Fannie Mae with respect to Fannie Mae and its assets, and (2) title to the books, records and assets of any other legal custodian of Fannie Mae. The conservator has since delegated specified authorities to our Board of Directors and has delegated to management the authority to conduct our day-to-day operations. The conservator retains the authority to withdraw its delegations at any time. The conservator has the power to transfer or sell any asset or liability of Fannie Mae (subject to limitations and post-transfer notice provisions for transfers of qualified financial contracts) without any approval, assignment of rights or consent of any party. The GSE Act, however, provides that mortgage loans and mortgage-related assets that have been transferred to a Fannie Mae mortgage-backed securities (“MBS”) trust must be held by the conservator for the beneficial owners of the Fannie Mae MBS and cannot be used to satisfy the general creditors of Fannie Mae. As of May 9, 2012, FHFA has not exercised this power. Neither the conservatorship nor the terms of our agreements with Treasury change our obligation to make required payments on our debt securities or perform under our mortgage guaranty obligations. FHFA issued a rule establishing a framework for conservatorship and receivership operations for the GSEs, which became effective in 2011. The rule established procedures for conservatorship and receivership, and priorities of claims for contract parties and other claimants. This rule is part of FHFA's implementation of the powers provided by the Federal Housing Finance Regulatory Reform Act of 2008, and does not seek to anticipate or predict future conservatorships or receiverships. FHFA has announced that, during the conservatorship, our existing statutory and FHFA-directed regulatory capital requirements will not be binding and that FHFA will not issue quarterly capital classifications. We submit capital reports to FHFA and FHFA monitors our capital levels. The deficit of core capital over statutory minimum capital was $147.8 billion as of March 31, 2012 and $148.4 billion as of December 31, 2011. The conservatorship has no specified termination date and there continues to be uncertainty regarding the future of our company, including how long the company will continue to exist in its current form, the extent of our role in the market, what form we will have, and what ownership interest, if any, our current common and preferred stockholders will hold in us after the conservatorship is terminated. Under the GSE Act, FHFA must place us into receivership if the Director of FHFA makes a written determination that our assets are less than our obligations or if we have not been paying our debts, in either case, for a period of 60 days. In addition, the Director of FHFA may place us in receivership at his discretion at any time for other reasons, including conditions that FHFA has already asserted existed at the time the former Director of FHFA placed us into conservatorship. Placement into receivership would have a material adverse effect on holders of our common stock, preferred stock, debt securities and Fannie Mae MBS. Should we be placed into receivership, different assumptions would be required to determine the carrying value of our assets, which could lead to substantially different financial results. We are not aware of any plans of FHFA to significantly change our business model or capital structure in the near term. Impact of U.S. Government Support We are dependent upon the continued support of Treasury to eliminate our net worth deficit, which avoids our being placed into receivership. Based on consideration of all the relevant conditions and events affecting our operations, including our dependence on the U.S. government, we continue to operate as a going concern and in accordance with our delegation of authority from FHFA. Pursuant to the senior preferred stock purchase agreement, Treasury has committed to provide us with funding as described below to help us maintain a positive net worth thereby avoiding the mandatory receivership trigger described above. We have received a total of $116.1 billion from Treasury pursuant to the senior preferred stock purchase agreement as of March 31, 2012. The aggregate liquidation preference of the senior preferred stock, including the initial aggregate liquidation preference of $1.0 billion, remains at $117.1 billion. The senior preferred stock purchase agreement provides that the $200 billion maximum amount of the commitment from Treasury will increase as necessary to accommodate any net worth deficiencies attributable to periods during 2010, 2011, and 2012. If we do not have a positive net worth as of December 31, 2012, then the amount of funding available under the amended senior preferred stock purchase agreement after 2012 will be $124.8 billion ($200 billion less $75.2 billion in cumulative draws for net worth deficiencies through December 31, 2009). In the event we have a positive net worth as of December 31, 2012, then the amount of funding available after 2012 under the amended senior preferred stock purchase agreement will depend on the size of that positive net worth relative to the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, as follows: If our positive net worth as of December 31, 2012 is less than the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, then the amount of available funding will be $124.8 billion less our positive net worth as of December 31, 2012. If our positive net worth as of December 31, 2012 is greater than the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, then the amount of available funding will be $124.8 billion less the cumulative draws attributable to periods during 2010, 2011, and 2012. We were scheduled to begin paying a quarterly commitment fee to Treasury under the senior preferred stock purchase agreement beginning on March 31, 2011; however, Treasury waived the quarterly commitment fee for each quarter of 2011 and the first and second quarters of 2012 due to the continued fragility of the U.S. mortgage market and Treasury's belief that the imposition of the quarterly commitment fee would not generate increased compensation for taxpayers. In its notification to FHFA that it had waived the quarterly commitment fee for the second quarter of 2012, Treasury indicated that it will reevaluate the situation during the next calendar quarter to determine whether the quarterly commitment fee should then be set. The agreement provides that Treasury may waive the periodic commitment fee for up to one year at a time, in its sole discretion, based on adverse conditions in the U.S. mortgage market. We fund our business primarily through the issuance of short-term and long-term debt securities in the domestic and international capital markets. Because debt issuance is our primary funding source, we are subject to “roll-over,” or refinancing, risk on our outstanding debt. Our ability to issue long-term debt has been strong primarily due to actions taken by the federal government to support us and the financial markets. We believe that continued federal government support of our business and the financial markets, as well as our status as a GSE, are essential to maintaining our access to debt funding. Changes or perceived changes in the government's support could materially adversely affect our ability to refinance our debt as it becomes due, which could have a material adverse impact on our liquidity, financial condition and results of operations. In addition, due to our reliance on the U.S. government's support, our access to debt funding or the cost of debt funding also could be materially adversely affected by a change or perceived change in the creditworthiness of the U.S. government. A downgrade in our credit ratings could reduce demand for our debt securities and increase our borrowing costs. Standard & Poor's Ratings Services' (“S&P”) downgrade of our credit rating on August 8, 2011, which was a result of a similar action on the U.S. government's sovereign credit rating, has not adversely affected our access to debt funding or the cost of our debt funding. Future changes or disruptions in the financial markets could significantly change the amount, mix and cost of funds we obtain, which also could increase our liquidity and roll-over risk and have a material adverse impact on our liquidity, financial condition and results of operations. In February 2011, Treasury and HUD released a report to Congress on reforming America's housing finance market. The report provides that the Obama Administration will work with FHFA to determine the best way to responsibly reduce Fannie Mae's and Freddie Mac's role in the market and ultimately wind down both institutions. The report emphasizes the importance of proceeding with a careful transition plan and providing the necessary financial support to Fannie Mae and Freddie Mac during the transition period. In February 2012, Treasury Secretary Geithner stated that the Administration intended to release new details in the spring of 2012 around approaches to housing finance reform including winding down Fannie Mae and Freddie Mac and to work with Congressional leaders to explore options for legislation, but that he does not expect housing finance reform legislation to be enacted in 2012. We cannot predict the prospects for the enactment, timing or content of legislative proposals regarding the future status of the GSEs. Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the SEC's instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments of a normal recurring nature considered necessary for a fair presentation have been included. The accompanying condensed consolidated financial statements include our accounts as well as the accounts of other entities in which we have a controlling financial interest. All intercompany accounts and transactions have been eliminated. Results for the three months ended March 31, 2012 may not necessarily be indicative of the results for the year ending December 31, 2012. The unaudited interim condensed consolidated financial statements as of and for the three months ended March 31, 2012 should be read in conjunction with our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2011 (“2011 Form 10-K”), filed with the SEC on February 29, 2012. Related Parties As a result of our issuance to Treasury of the warrant to purchase shares of Fannie Mae common stock equal to 79.9% of the total number of shares of Fannie Mae common stock, we and Treasury are deemed related parties. As of March 31, 2012, Treasury held an investment in our senior preferred stock with an aggregate liquidation preference of $117.1 billion. Our administrative expenses were reduced by $22 million and $35 million for the three months ended March 31, 2012 and 2011, respectively, due to reimbursements from Treasury and Freddie Mac for expenses incurred as program administrator for Treasury's Home Affordable Modification Program (“HAMP”) and other initiatives under Treasury's Making Home Affordable Program. During the three months ended March 31, 2011, we received a refund of $1.1 billion from the Internal Revenue Service (“IRS”) related to the carryback of our 2009 operating loss to the 2008 and 2007 tax years. Under the temporary credit and liquidity facilities (“TCLF”) program, we had $2.6 billion and $3.0 billion outstanding, which include principal and interest, of three-year standby credit and liquidity support as of March 31, 2012 and December 31, 2011, respectively. Under the new issue bond (“NIB”) program, we had $7.3 billion and $7.5 billion outstanding of pass-through securities backed by single-family and multifamily housing bonds issued by housing finance agencies (“HFAs”) as of March 31, 2012 and December 31, 2011, respectively. Treasury will bear any initial losses of principal under the TCLF program and the NIB program up to 35% of the total original principal on a combined program-wide basis, and thereafter we will bear the losses of principal that are attributable to the TCLF and the securities we have issued. Treasury will also bear any losses of unpaid interest under the two programs. As of March 31, 2012, there had been no losses of principal or interest under the TCLF program or the NIB program. FHFA's control of both us and Freddie Mac has caused us and Freddie Mac to be related parties. No transactions outside of normal business activities have occurred between us and Freddie Mac. As of March 31, 2012 and December 31, 2011, we held Freddie Mac mortgage-related securities with a fair value of $14.5 billion and $15.6 billion, respectively, and accrued interest receivable of $64 million and $69 million, respectively. We recognized interest income on these securities held by us of $153 million and $188 million for the three months ended March 31, 2012 and 2011, respectively. In addition, Freddie Mac may be an investor in variable interest entities that we have consolidated, and we may be an investor in variable interest entities that Freddie Mac has consolidated. Use of Estimates Preparing condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect our reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities as of the dates of our condensed consolidated financial statements, as well as our reported amounts of revenues and expenses during the reporting periods. Management has made significant estimates in a variety of areas including, but not limited to, valuation of certain financial instruments, and other assets and liabilities, the allowance for loan losses and reserve for guaranty losses, and other-than-temporary impairment of investment securities. Actual results could be different from these estimates. Collateral Our liability to third party holders of Fannie Mae MBS that arises as the result of a consolidation of a securitization trust is collateralized by the underlying loans and/or mortgage-related securities. We had reverse repurchase agreements outstanding of $26.0 billion and $49.5 billion as of March 31, 2012 and December 31, 2011, respectively. The fair value of non-cash collateral we accepted was $26.1 billion and $50.1 billion as of March 31, 2012 and December 31, 2011, respectively, of which we were permitted to sell or repledge $20.0 billion as of March 31, 2012 and December 31, 2011. None of the underlying collateral was sold or repledged as of March 31, 2012 or December 31, 2011. We had no repurchase agreements outstanding as of March 31, 2012 or December 31, 2011 Reclassifications To conform to our current period presentation, we have reclassified certain amounts reported in our condensed consolidated financial statements. Adoption of New Accounting Guidance Effective January 1, 2012, we prospectively adopted guidance issued by the Financial Accounting Standards Board (“FASB”) related to fair value measurement. The new guidance does not expand the use of fair value; instead, it provides guidance about how fair value should be determined where it already is required or permitted under U.S. GAAP. The new fair value guidance changes certain fair value principles and clarifies the FASB's intent on certain items, including a clarification that the principal market should be determined based on the market the entity has access to with the greatest volume and level of activity for the asset or liability. It also expands the disclosures about fair value measurements. The adoption of this guidance did not have a material impact on our condensed consolidated financial statements; however, it required us to expand our fair value disclosures. See “Note 12, Fair Value,” for additional information regarding the impact upon adoption of this guidance.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2012

Notes to Consolidated Financial Statements [Abstract]

Summary of Significant Accounting Policies

1. Summary of Significant Accounting Policies

Organization

We are a stockholder-owned corporation organized and existing under the Federal National Mortgage Association Charter Act (the "Charter Act" or our "charter"). We are a government-sponsored enterprise ("GSE"), and we are subject to government oversight and regulation. Our regulators include the Federal Housing Finance Agency ("FHFA"), the U.S. Department of Housing and Urban Development ("HUD"), the U.S. Securities and Exchange Commission ("SEC"), and the U.S. Department of the Treasury ("Treasury"). The U.S. government does not guarantee our securities or other obligations.

Conservatorship

On September 7, 2008, the Secretary of the Treasury and the Director of FHFA announced several actions taken by Treasury and FHFA regarding Fannie Mae, which included: (1) placing us in conservatorship and (2) the execution of a senior preferred stock purchase agreement by our conservator, on our behalf, and Treasury, pursuant to which we issued to Treasury both senior preferred stock and a warrant to purchase common stock.

Under the Federal Housing Enterprises Financial Safety and Soundness Act of 1992, as amended by the Federal Housing Finance Regulatory Reform Act of 2008, (together, the “GSE Act”), the conservator immediately succeeded to (1) all rights, titles, powers and privileges of Fannie Mae, and of any stockholder, officer or director of Fannie Mae with respect to Fannie Mae and its assets, and (2) title to the books, records and assets of any other legal custodian of Fannie Mae. The conservator has since delegated specified authorities to our Board of Directors and has delegated to management the authority to conduct our day-to-day operations. The conservator retains the authority to withdraw its delegations at any time.

The conservator has the power to transfer or sell any asset or liability of Fannie Mae (subject to limitations and post-transfer notice provisions for transfers of qualified financial contracts) without any approval, assignment of rights or consent of any party. The GSE Act, however, provides that mortgage loans and mortgage-related assets that have been transferred to a Fannie Mae mortgage-backed securities (“MBS”) trust must be held by the conservator for the beneficial owners of the Fannie Mae MBS and cannot be used to satisfy the general creditors of Fannie Mae. As of May 9, 2012, FHFA has not exercised this power.

Neither the conservatorship nor the terms of our agreements with Treasury change our obligation to make required payments on our debt securities or perform under our mortgage guaranty obligations. FHFA issued a rule establishing a framework for conservatorship and receivership operations for the GSEs, which became effective in 2011. The rule established procedures for conservatorship and receivership, and priorities of claims for contract parties and other claimants. This rule is part of FHFA's implementation of the powers provided by the Federal Housing Finance Regulatory Reform Act of 2008, and does not seek to anticipate or predict future conservatorships or receiverships.

FHFA has announced that, during the conservatorship, our existing statutory and FHFA-directed regulatory capital requirements will not be binding and that FHFA will not issue quarterly capital classifications. We submit capital reports to FHFA and FHFA monitors our capital levels. The deficit of core capital over statutory minimum capital was $147.8 billion as of March 31, 2012 and $148.4 billion as of December 31, 2011.

The conservatorship has no specified termination date and there continues to be uncertainty regarding the future of our company, including how long the company will continue to exist in its current form, the extent of our role in the market, what form we will have, and what ownership interest, if any, our current common and preferred stockholders will hold in us after the conservatorship is terminated. Under the GSE Act, FHFA must place us into receivership if the Director of FHFA makes a written determination that our assets are less than our obligations or if we have not been paying our debts, in either case, for a period of 60 days. In addition, the Director of FHFA may place us in receivership at his discretion at any time for other reasons, including conditions that FHFA has already asserted existed at the time the former Director of FHFA placed us into conservatorship. Placement into receivership would have a material adverse effect on holders of our common stock, preferred stock, debt securities and Fannie Mae MBS. Should we be placed into receivership, different assumptions would be required to determine the carrying value of our assets, which could lead to substantially different financial results. We are not aware of any plans of FHFA to significantly change our business model or capital structure in the near term.

Impact of U.S. Government Support

We are dependent upon the continued support of Treasury to eliminate our net worth deficit, which avoids our being placed into receivership. Based on consideration of all the relevant conditions and events affecting our operations, including our dependence on the U.S. government, we continue to operate as a going concern and in accordance with our delegation of authority from FHFA.

Pursuant to the senior preferred stock purchase agreement, Treasury has committed to provide us with funding as described below to help us maintain a positive net worth thereby avoiding the mandatory receivership trigger described above. We have received a total of $116.1 billion from Treasury pursuant to the senior preferred stock purchase agreement as of March 31, 2012. The aggregate liquidation preference of the senior preferred stock, including the initial aggregate liquidation preference of $1.0 billion, remains at $117.1 billion.

The senior preferred stock purchase agreement provides that the $200 billion maximum amount of the commitment from Treasury will increase as necessary to accommodate any net worth deficiencies attributable to periods during 2010, 2011, and 2012. If we do not have a positive net worth as of December 31, 2012, then the amount of funding available under the amended senior preferred stock purchase agreement after 2012 will be $124.8 billion ($200 billion less $75.2 billion in cumulative draws for net worth deficiencies through December 31, 2009).

In the event we have a positive net worth as of December 31, 2012, then the amount of funding available after 2012 under the amended senior preferred stock purchase agreement will depend on the size of that positive net worth relative to the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, as follows:

If our positive net worth as of December 31, 2012 is less than the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, then the amount of available funding will be $124.8 billion less our positive net worth as of December 31, 2012.
If our positive net worth as of December 31, 2012 is greater than the cumulative draws for net worth deficiencies attributable to periods during 2010, 2011, and 2012, then the amount of available funding will be $124.8 billion less the cumulative draws attributable to periods during 2010, 2011, and 2012.

We were scheduled to begin paying a quarterly commitment fee to Treasury under the senior preferred stock purchase agreement beginning on March 31, 2011; however, Treasury waived the quarterly commitment fee for each quarter of 2011 and the first and second quarters of 2012 due to the continued fragility of the U.S. mortgage market and Treasury's belief that the imposition of the quarterly commitment fee would not generate increased compensation for taxpayers. In its notification to FHFA that it had waived the quarterly commitment fee for the second quarter of 2012, Treasury indicated that it will reevaluate the situation during the next calendar quarter to determine whether the quarterly commitment fee should then be set. The agreement provides that Treasury may waive the periodic commitment fee for up to one year at a time, in its sole discretion, based on adverse conditions in the U.S. mortgage market.

We fund our business primarily through the issuance of short-term and long-term debt securities in the domestic and international capital markets. Because debt issuance is our primary funding source, we are subject to “roll-over,” or refinancing, risk on our outstanding debt. Our ability to issue long-term debt has been strong primarily due to actions taken by the federal government to support us and the financial markets.

We believe that continued federal government support of our business and the financial markets, as well as our status as a GSE, are essential to maintaining our access to debt funding. Changes or perceived changes in the government's support could materially adversely affect our ability to refinance our debt as it becomes due, which could have a material adverse impact on our liquidity, financial condition and results of operations. In addition, due to our reliance on the U.S. government's support, our access to debt funding or the cost of debt funding also could be materially adversely affected by a change or perceived change in the creditworthiness of the U.S. government. A downgrade in our credit ratings could reduce demand for our debt securities and increase our borrowing costs. Standard & Poor's Ratings Services' (“S&P”) downgrade of our credit rating on August 8, 2011, which was a result of a similar action on the U.S. government's sovereign credit rating, has not adversely affected our access to debt funding or the cost of our debt funding. Future changes or disruptions in the financial markets could significantly change the amount, mix and cost of funds we obtain, which also could increase our liquidity and roll-over risk and have a material adverse impact on our liquidity, financial condition and results of operations.

In February 2011, Treasury and HUD released a report to Congress on reforming America's housing finance market. The report provides that the Obama Administration will work with FHFA to determine the best way to responsibly reduce Fannie Mae's and Freddie Mac's role in the market and ultimately wind down both institutions. The report emphasizes the importance of proceeding with a careful transition plan and providing the necessary financial support to Fannie Mae and Freddie Mac during the transition period. In February 2012, Treasury Secretary Geithner stated that the Administration intended to release new details in the spring of 2012 around approaches to housing finance reform including winding down Fannie Mae and Freddie Mac and to work with Congressional leaders to explore options for legislation, but that he does not expect housing finance reform legislation to be enacted in 2012. We cannot predict the prospects for the enactment, timing or content of legislative proposals regarding the future status of the GSEs.

Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the SEC's instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments of a normal recurring nature considered necessary for a fair presentation have been included. The accompanying condensed consolidated financial statements include our accounts as well as the accounts of other entities in which we have a controlling financial interest. All intercompany accounts and transactions have been eliminated. Results for the three months ended March 31, 2012 may not necessarily be indicative of the results for the year ending December 31, 2012. The unaudited interim condensed consolidated financial statements as of and for the three months ended March 31, 2012 should be read in conjunction with our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2011 (“2011 Form 10-K”), filed with the SEC on February 29, 2012.

Related Parties

As a result of our issuance to Treasury of the warrant to purchase shares of Fannie Mae common stock equal to 79.9% of the total number of shares of Fannie Mae common stock, we and Treasury are deemed related parties. As of March 31, 2012, Treasury held an investment in our senior preferred stock with an aggregate liquidation preference of $117.1 billion. Our administrative expenses were reduced by $22 million and $35 million for the three months ended March 31, 2012 and 2011, respectively, due to reimbursements from Treasury and Freddie Mac for expenses incurred as program administrator for Treasury's Home Affordable Modification Program (“HAMP”) and other initiatives under Treasury's Making Home Affordable Program.

During the three months ended March 31, 2011, we received a refund of $1.1 billion from the Internal Revenue Service (“IRS”) related to the carryback of our 2009 operating loss to the 2008 and 2007 tax years.

Under the temporary credit and liquidity facilities (“TCLF”) program, we had $2.6 billion and $3.0 billion outstanding, which include principal and interest, of three-year standby credit and liquidity support as of March 31, 2012 and December 31, 2011, respectively. Under the new issue bond (“NIB”) program, we had $7.3 billion and $7.5 billion outstanding of pass-through securities backed by single-family and multifamily housing bonds issued by housing finance agencies (“HFAs”) as of March 31, 2012 and December 31, 2011, respectively. Treasury will bear any initial losses of principal under the TCLF program and the NIB program up to 35% of the total original principal on a combined program-wide basis, and thereafter we will bear the losses of principal that are attributable to the TCLF and the securities we have issued. Treasury will also bear any losses of unpaid interest under the two programs. As of March 31, 2012, there had been no losses of principal or interest under the TCLF program or the NIB program.

FHFA's control of both us and Freddie Mac has caused us and Freddie Mac to be related parties. No transactions outside of normal business activities have occurred between us and Freddie Mac. As of March 31, 2012 and December 31, 2011, we held Freddie Mac mortgage-related securities with a fair value of $14.5 billion and $15.6 billion, respectively, and accrued interest receivable of $64 million and $69 million, respectively. We recognized interest income on these securities held by us of $153 million and $188 million for the three months ended March 31, 2012 and 2011, respectively. In addition, Freddie Mac may be an investor in variable interest entities that we have consolidated, and we may be an investor in variable interest entities that Freddie Mac has consolidated.

Use of Estimates

Preparing condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect our reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities as of the dates of our condensed consolidated financial statements, as well as our reported amounts of revenues and expenses during the reporting periods. Management has made significant estimates in a variety of areas including, but not limited to, valuation of certain financial instruments, and other assets and liabilities, the allowance for loan losses and reserve for guaranty losses, and other-than-temporary impairment of investment securities. Actual results could be different from these estimates.

Collateral

Our liability to third party holders of Fannie Mae MBS that arises as the result of a consolidation of a securitization trust is collateralized by the underlying loans and/or mortgage-related securities.

We had reverse repurchase agreements outstanding of $26.0 billion and $49.5 billion as of March 31, 2012 and December 31, 2011, respectively. The fair value of non-cash collateral we accepted was $26.1 billion and $50.1 billion as of March 31, 2012 and December 31, 2011, respectively, of which we were permitted to sell or repledge $20.0 billion as of March 31, 2012 and December 31, 2011. None of the underlying collateral was sold or repledged as of March 31, 2012 or December 31, 2011.

We had no repurchase agreements outstanding as of March 31, 2012 or December 31, 2011

Reclassifications

To conform to our current period presentation, we have reclassified certain amounts reported in our condensed consolidated financial statements.

Adoption of New Accounting Guidance

Effective January 1, 2012, we prospectively adopted guidance issued by the Financial Accounting Standards Board (“FASB”) related to fair value measurement. The new guidance does not expand the use of fair value; instead, it provides guidance about how fair value should be determined where it already is required or permitted under U.S. GAAP. The new fair value guidance changes certain fair value principles and clarifies the FASB's intent on certain items, including a clarification that the principal market should be determined based on the market the entity has access to with the greatest volume and level of activity for the asset or liability. It also expands the disclosures about fair value measurements. The adoption of this guidance did not have a material impact on our condensed consolidated financial statements; however, it required us to expand our fair value disclosures. See “Note 12, Fair Value,” for additional information regarding the impact upon adoption of this guidance.

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

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