Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	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. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete consolidated financial statements and therefore should be read in conjunction with our audited consolidated financial statements and related notes included in our 2023 Form 10-K. In the opinion of management, our unaudited interim condensed consolidated financial statements contain all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of our results. The nature of our business is such that the results of any interim period are not necessarily indicative of results for a full year. 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 balances and transactions have been eliminated. To conform to our current-period presentation, we have reclassified certain amounts reported in our prior period consolidated financial statements.
Use of Estimates	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, the allowance for loan losses. Actual results could be different from these estimates.
Earnings per Share	Earnings per Share Earnings per share (“EPS”) is presented for basic and diluted EPS. We include the shares of common stock that would be issuable upon full exercise of the common stock warrant in the weighted average shares outstanding for the computation of both basic and diluted earnings per share. Weighted average common shares include 4.7 billion shares for the periods ended June 30, 2024 and 2023 that would have been issued upon the full exercise of the warrant issued to Treasury from the date the warrant was issued through June 30, 2024 and 2023. For the calculation of diluted EPS, the weighted average shares outstanding is increased to include the number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued. For the three and six months ended June 30, 2024, our diluted EPS weighted-average shares outstanding includes 26 million shares issuable upon the conversion of convertible preferred stock. For the three and six months ended June 30, 2023, convertible preferred stock is not included in the calculation because it would have an anti-dilutive effect due to the net losses attributable to common stockholders recognized in those periods.
New Accounting Guidance	New Accounting Guidance Segment Reporting On November 27, 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures. The ASU enhances disclosure of an entity’s reportable segments by requiring additional information about significant segment expenses, interim disclosures of certain segment information that previously were only required on an annual basis and other detailed segment-related disclosures. The ASU applies to all public entities that are required to report segment information and is effective starting in annual periods beginning after December 15, 2023 and interim periods beginning after December 15, 2024. The ASU is required to be adopted retrospectively to all prior periods presented in the financial statements. The adoption of this guidance is not expected to have a material impact on our financial statements. Income Taxes On December 14, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances the required disclosures primarily related to the income tax rate reconciliation and income taxes paid. The ASU requires an entity’s income tax rate reconciliation to provide additional information for reconciling items meeting a quantitative threshold, and to disclose certain selected categories within the income tax rate reconciliation. The ASU also requires entities to disclose the amount of income taxes paid, disaggregated by federal, state and foreign taxes. The ASU is effective for annual periods beginning after December 15, 2024, though early adoption is permitted. The adoption of this guidance is not expected to have a material impact on our financial statements.
Conservatorship	Conservatorship We are currently operating under conservatorship, with FHFA acting as conservator. The conservatorship and related matters significantly affect our management, business activities, financial condition and results of operations.
Related Parties	Related Parties Because Treasury holds a 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 June 30, 2024, Treasury held an investment in our senior preferred stock with an aggregate liquidation preference of $203.5 billion. FHFA’s control of both Fannie Mae and Freddie Mac has caused Fannie Mae, FHFA and Freddie Mac to be deemed related parties. Additionally, Fannie Mae and Freddie Mac jointly own Common Securitization Solutions, LLC (“CSS”), a limited liability company created to operate a common securitization platform; as a result, CSS is deemed a related party. CSS operates as a separate company from us and Freddie Mac, with all funding and limited administrative support services and other resources provided to it by us and Freddie Mac. In the ordinary course of business, Fannie Mae may purchase and sell securities issued by Treasury and Freddie Mac in the capital markets. Some of the structured securities we issue are backed in whole or in part by Freddie Mac securities. Fannie Mae and Freddie Mac each have agreed to indemnify the other party for losses caused by: its failure to meet its payment or other specified obligations under the trust agreements pursuant to which the underlying resecuritized securities were issued; its failure to meet its obligations under the customer services agreement; its violations of laws; or with respect to material misstatements or omissions in offering documents, ongoing disclosures and materials relating to the underlying resecuritized securities. We also make regular income tax payments to and receive tax refunds from the Internal Revenue Service (“IRS”), a bureau of Treasury. The following table provides the income statement impact of our related party transactions for the periods presented in addition to the associated liability at period end. The associated liability represents amounts accrued with respect to the related party transactions that have not yet been paid to the applicable related parties. In addition to the impact described in the table below, our investment in CSS, which is accounted for using the equity method, is classified as “Other assets” in our condensed consolidated balance sheets.
Unconsolidated VIEs	Unconsolidated VIEs We do not consolidate VIEs when we are not deemed to be the primary beneficiary.
Transfers of Financial Assets and Portfolio Securitizations	Transfers of Financial Assets and Portfolio Securitizations We issue Fannie Mae MBS through portfolio securitization transactions by transferring pools of mortgage loans or mortgage-related securities to one or more trusts or special purpose entities. We retain interests from the transfer and sale of mortgage-related securities to unconsolidated single-class and multi-class portfolio securitization trusts.
Mortgage Loans Held-for-investment	we report the amortized cost of HFI loans for which we have not elected the fair value option at the unpaid principal balance, net of unamortized premiums and discounts, hedge-related basis adjustments, other cost basis adjustments, and accrued interest receivable. Within our condensed consolidated balance sheets, we present accrued interest receivable, net separately from the amortized cost of our loans held for investment.
Mortgage Loans Held-for-sale	We report the carrying value of HFS loans at the lower of cost or fair value and record valuation changes in “Investment gains (losses), net” in our condensed consolidated statements of operations and comprehensive income.
Mortgage Loans Loss Mitigation	As part of our loss mitigation activities, we offer several types of loan restructurings to assist borrowers who experience financial difficulties. We do not typically offer principal forgiveness to our single-family or multifamily borrowers. For single-family borrowers, we may offer loan restructurings that are only in the form of a payment delay (e.g., a forbearance plan, a repayment plan, or a payment deferral). We may also offer loan modifications that contractually change the terms of the loan, generally after the successful completion of a three to four month trial period. Single-family loan modifications may result in the capitalization of past due amounts (a form of payment delay), an interest rate reduction, a term extension, a principal forbearance (which is another form of payment delay), or a combination thereof. During the trial period, the borrower makes reduced payments that are an estimate of the anticipated modified payment amount. Additionally, during the trial period, the mortgage loan is not contractually modified such that the loan continues to be reported as past due and the trial period is considered a form of payment delay with respect to the original contractual terms of the loan. For multifamily borrowers, loan restructurings include short-term forbearance plans and loan modification programs, which primarily result in term extensions of up to one year with no change to the loan’s interest rate. In certain cases, we may make more significant modifications of terms for borrowers experiencing financial difficulty, such as reducing the interest rate, converting to interest-only payments, extending the maturity for longer than one year, providing principal forbearance, or some combination of these terms. In some instances when a loan is restructured, we may require additional collateral, which may take the form of a guaranty from another entity, to further mitigate the risk of nonperformance. Our estimate of future credit losses uses a lifetime methodology, derived from modeled loan performance based on extensive historical experience of loans with similar risk characteristics, adjusted to reflect current conditions and reasonable and supportable forecasts. The historical loss experience used in our single-family and multifamily credit loss models includes the impact of the loss mitigation options provided to borrowers experiencing financial difficulty, and also includes the impact of projected loss severities as a result of a loan default.
Nonaccrual Loans and Allowance for Loan Losses	The estimated mark-to-market loan-to-value (“LTV”) ratio is a primary factor we consider when estimating our allowance for loan losses for single-family loans. As LTV ratios increase, the borrower’s equity in the home decreases, which may negatively affect the borrower’s ability to refinance or to sell the property for an amount at or above the outstanding balance of the loan. Nonaccrual Loans We recognize interest income on an accrual basis except when we believe the collection of principal and interest is not reasonably assured. This generally occurs when a single-family loan is three or more months past due and a multifamily loan is two or more months past due according to its contractual terms. A loan is reported as past due if a full payment of principal and interest is not received within one month of its due date. When a loan is placed on nonaccrual status based on delinquency status, interest previously accrued but not collected on the loan is reversed through interest income. Cost basis adjustments on HFI loans are amortized into interest income over the contractual life of the loan using the effective interest method. Cost basis adjustments on the loan are not amortized into income while a loan is on nonaccrual status. We have elected not to measure an allowance for credit losses on accrued interest receivable balances as we have a nonaccrual policy to ensure the timely reversal of unpaid accrued interest. For single-family loans, we recognize any contractual interest payments received on the loan while on nonaccrual status as interest income on a cash basis. For multifamily loans, we account for interest income on a cost recovery basis and we apply any payment received while on nonaccrual status to reduce the amortized cost of the loan. Thus, we do not recognize any interest income on a multifamily loan placed on nonaccrual status until the amortized cost of the loan has been reduced to zero. A nonaccrual loan is returned to accrual status when the full collection of principal and interest is reasonably assured. We generally determine that the full collection of principal and interest is reasonably assured when the loan returns to current payment status. If a loan is restructured for a borrower experiencing financial difficulty, we require a performance period of up to 6 months before we return the loan to accrual status. Upon a loan’s return to accrual status, we resume the recognition of interest income on an accrual basis and the amortization of cost basis adjustments, if any, into interest income. If interest is capitalized pursuant to a restructuring, any capitalized interest that had not been previously recognized as interest income or that had been reversed through interest income when the loan was placed on nonaccrual status is recorded as a discount to the loan and amortized into interest income over the remaining contractual life of the loan. We maintain an allowance for loan losses for HFI loans held by Fannie Mae and by consolidated Fannie Mae MBS trusts, excluding loans for which we have elected the fair value option. When calculating our allowance for loan losses, we consider the unpaid principal balance, net of unamortized premiums and discounts, and other cost basis adjustments of HFI loans at the balance sheet date. We record write-offs as a reduction to our allowance for loan losses at the point of foreclosure, completion of a short sale, upon the redesignation of nonperforming and reperforming loans from HFI to HFS or when a loan is determined to be uncollectible. Our benefit (provision) for loan losses can vary substantially from period to period based on a number of factors, such as changes in actual and forecasted home prices or property valuations, fluctuations in actual and forecasted interest rates, borrower payment behavior, events such as natural disasters or pandemics, the type, volume and effectiveness of our loss mitigation activities, including forbearances and loan modifications, the volume of foreclosures completed, and the volume and pricing of loans redesignated from HFI to HFS. Our benefit or provision can also be impacted by updates to the models, assumptions, and data used in determining our allowance for loan losses.
Trading and Available-for-sale Securities	Trading Securities Trading securities are recorded at fair value with subsequent changes in fair value recorded as “Fair value gains (losses), net” in our condensed consolidated statements of operations and comprehensive income. Available-for-Sale Securities We record AFS securities at fair value with unrealized gains and losses, recorded net of tax, as a component of “Other comprehensive income (loss)” and we recognize realized gains and losses from the sale of AFS securities in “Investment gains (losses), net” in our condensed consolidated statements of operations and comprehensive income. We define the amortized cost basis of our AFS securities as unpaid principal balance, net of unamortized premiums and discounts, and other cost basis adjustments. We record an allowance for credit losses for AFS securities that reflects the impairment for credit losses, which are limited to the amount that fair value is less than the amortized cost. Impairment due to non-credit losses are recorded as unrealized losses within “Other comprehensive income (loss).”
Financial Guarantees	We recognize a guaranty obligation for our obligation to stand ready to perform on our guarantees to unconsolidated trusts and other guaranty arrangements. These off-balance sheet guarantees expose us to credit losses primarily relating to the unpaid principal balance of our unconsolidated Fannie Mae MBS and other financial guarantees.We measure our guaranty reserve for estimated credit losses for off-balance sheet exposures over the contractual period for which they are exposed to the credit risk, unless that obligation is unconditionally cancellable by the issuer.
Derivatives	We recognize all derivatives as either assets or liabilities in our condensed consolidated balance sheets at their fair value on a trade date basis. Fair value amounts, which are (1) netted to the extent a legal right of offset exists and is enforceable by law at the counterparty level and (2) inclusive of the right or obligation associated with the cash collateral posted or received, are recorded in “Other assets” or “Other liabilities” in our condensed consolidated balance sheets.We present cash flows from derivatives as operating activities in our condensed consolidated statements of cash flows.We record all gains and losses, including accrued interest, on derivatives while they are not in a qualifying designated hedging relationship in “Fair value gains (losses), net” in our condensed consolidated statements of operations and comprehensive income.
Derivatives, Methods of Accounting, Hedging Derivatives	Pursuant to our fair value hedge accounting program, we may designate certain interest-rate swaps as hedging instruments in hedges of the change in fair value attributable to the designated benchmark interest rate for certain closed pools of fixed-rate, single-family mortgage loans or our funding debt. For hedged items in qualifying fair value hedging relationships, changes in fair value attributable to the designated risk are recognized as a basis adjustment to the hedged item. We also report changes in the fair value of the derivative hedging instrument in the same condensed consolidated statements of operations and comprehensive income line item used to recognize the earnings effect of the hedged item’s basis adjustment.
Segment Reporting	We have two reportable business segments, which are based on the type of business activities each perform: Single-Family and Multifamily. Results of our two business segments are intended to reflect each segment as if it were a stand-alone business. The sum of the results for our two business segments equals our condensed consolidated results of operations.
Concentrations of Credit Risk	One of the measures by which management gauges our credit risk is the delinquency status of the mortgage loans in our guaranty book of business. For single-family and multifamily loans, management uses this information, in conjunction with housing market data, other economic data, our capital requirements and our mission objectives, to help inform changes to our pricing and our eligibility and underwriting criteria. Management also uses this data together with other credit risk measures to identify key trends that guide the development of our loss mitigation strategies.
Derivatives, Offsetting	Derivative instruments are recorded at fair value and securities purchased under agreements to resell are recorded at amortized cost in our condensed consolidated balance sheets.
Fair Value Measurement	Fair Value Measurement Fair value measurement guidance defines fair value, establishes a framework for measuring fair value, and sets forth disclosures around fair value measurements. This guidance applies whenever other accounting guidance requires or permits assets or liabilities to be measured at fair value. The guidance establishes a three-level fair value hierarchy that prioritizes the inputs into the valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority, Level 1, to measurements based on unadjusted quoted prices in active markets for identical assets or liabilities. The next highest priority, Level 2, is given to measurements of assets and liabilities based on limited observable inputs or observable inputs for similar assets and liabilities. The lowest priority, Level 3, is given to measurements based on unobservable inputs. In our condensed consolidated balance sheets, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when we evaluate loans for impairment). Fair Value Option We generally elect the fair value option on a financial instrument when the accounting guidance would otherwise require us to separately account for a derivative that is embedded in an instrument at fair value. Under the fair value option, we carry this type of instrument, in its entirety, at fair value instead of separately accounting for the derivative. Interest income for the mortgage loans is recorded in “Interest income: Mortgage loans” and interest expense for the debt instruments is recorded in “Interest expense: Long-term debt” in our condensed consolidated statements of operations and comprehensive income.
Fair Value of Financial Instruments	The fair value of financial instruments we disclose includes commitments to purchase multifamily and single-family mortgage loans that we do not record in our condensed consolidated balance sheets. The fair values of these commitments are included as “Mortgage loans held for investment, net of allowance for loan losses.”
Commitments and Contingencies	On a quarterly basis, we review relevant information about pending legal actions and proceedings for the purpose of evaluating and revising our contingencies, accruals and disclosures. We establish an accrual only for matters when the likelihood of a loss is probable and we can reasonably estimate the amount of such loss.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2024

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. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete consolidated financial statements and therefore should be read in conjunction with our audited consolidated financial statements and related notes included in our 2023 Form 10-K. In the opinion of management, our unaudited interim condensed consolidated financial statements contain all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of our results. The nature of our business is such that the results of any interim period are not necessarily indicative of results for a full year. 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 balances and transactions have been eliminated. To conform to our current-period presentation, we have reclassified certain amounts reported in our prior period consolidated financial statements.

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, the allowance for loan losses. Actual results could be different from these estimates.

Earnings per Share

Earnings per share (“EPS”) is presented for basic and diluted EPS. We include the shares of common stock that would be issuable upon full exercise of the common stock warrant in the weighted average shares outstanding for the computation of both basic and diluted earnings per share. Weighted average common shares include 4.7 billion shares for the periods ended June 30, 2024 and 2023 that would have been issued upon the full exercise of the warrant issued to Treasury from the date the warrant was issued through June 30, 2024 and 2023.

For the calculation of diluted EPS, the weighted average shares outstanding is increased to include the number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued. For the three and six months ended June 30, 2024, our diluted EPS weighted-average shares outstanding includes 26 million shares issuable upon the conversion of convertible preferred stock. For the three and six months ended June 30, 2023, convertible preferred stock is not included in the calculation because it would have an anti-dilutive effect due to the net losses attributable to common stockholders recognized in those periods.

New Accounting Guidance

Segment Reporting

On November 27, 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures. The ASU enhances disclosure of an entity’s reportable segments by requiring additional information about significant segment expenses, interim disclosures of certain segment information that previously were only required on an annual basis and other detailed segment-related disclosures. The ASU applies to all public entities that are required to report segment information and is effective starting in annual periods beginning after December 15, 2023 and interim periods beginning after December 15, 2024. The ASU is required to be adopted retrospectively to all prior periods presented in the financial statements. The adoption of this guidance is not expected to have a material impact on our financial statements.

Income Taxes

On December 14, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances the required disclosures primarily related to the income tax rate reconciliation and income taxes paid. The ASU requires an entity’s income tax rate reconciliation to provide additional information for reconciling items meeting a quantitative threshold, and to disclose certain selected categories within the income tax rate reconciliation. The ASU also requires entities to disclose the amount of income taxes paid, disaggregated by federal, state and foreign taxes. The ASU is effective for annual periods beginning after December 15, 2024, though early adoption is permitted. The adoption of this guidance is not expected to have a material impact on our financial statements.

Conservatorship

We are currently operating under conservatorship, with FHFA acting as conservator. The conservatorship and related matters significantly affect our management, business activities, financial condition and results of operations.

Related Parties

Because Treasury holds a 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 June 30, 2024, Treasury held an investment in our senior preferred stock with an aggregate liquidation preference of $203.5 billion.

FHFA’s control of both Fannie Mae and Freddie Mac has caused Fannie Mae, FHFA and Freddie Mac to be deemed related parties. Additionally, Fannie Mae and Freddie Mac jointly own Common Securitization Solutions, LLC (“CSS”), a limited liability company created to operate a common securitization platform; as a result, CSS is deemed a related party. CSS operates as a separate company from us and Freddie Mac, with all funding and limited administrative support services and other resources provided to it by us and Freddie Mac.

In the ordinary course of business, Fannie Mae may purchase and sell securities issued by Treasury and Freddie Mac in the capital markets. Some of the structured securities we issue are backed in whole or in part by Freddie Mac securities. Fannie Mae and Freddie Mac each have agreed to indemnify the other party for losses caused by: its failure to meet its payment or other specified obligations under the trust agreements pursuant to which the underlying resecuritized securities were issued; its failure to meet its obligations under the customer services agreement; its violations of laws; or with respect to material misstatements or omissions in offering documents, ongoing disclosures and materials relating to the underlying resecuritized securities. We also make regular income tax payments to and receive tax refunds from the Internal Revenue Service (“IRS”), a bureau of Treasury.

The following table provides the income statement impact of our related party transactions for the periods presented in addition to the associated liability at period end. The associated liability represents amounts accrued with respect to the related party transactions that have not yet been paid to the applicable related parties. In addition to the impact described in the table below, our investment in CSS, which is accounted for using the equity method, is classified as “Other assets” in our condensed consolidated balance sheets.

Unconsolidated VIEs

We do not consolidate VIEs when we are not deemed to be the primary beneficiary.

Transfers of Financial Assets and Portfolio Securitizations

We issue Fannie Mae MBS through portfolio securitization transactions by transferring pools of mortgage loans or mortgage-related securities to one or more trusts or special purpose entities. We retain interests from the transfer and sale of mortgage-related securities to unconsolidated single-class and multi-class portfolio securitization trusts.

Mortgage Loans Held-for-investment

we report the amortized cost of HFI loans for which we have not elected the fair value option at the unpaid principal balance, net of unamortized premiums and discounts, hedge-related basis adjustments, other cost basis adjustments, and accrued interest receivable. Within our condensed consolidated balance sheets, we present accrued interest receivable, net separately from the amortized cost of our loans held for investment.

Mortgage Loans Held-for-sale

We report the carrying value of HFS loans at the lower of cost or fair value and record valuation changes in “Investment gains (losses), net” in our condensed consolidated statements of operations and comprehensive income.

Mortgage Loans Loss Mitigation

As part of our loss mitigation activities, we offer several types of loan restructurings to assist borrowers who experience financial difficulties. We do not typically offer principal forgiveness to our single-family or multifamily borrowers.

For single-family borrowers, we may offer loan restructurings that are only in the form of a payment delay (e.g., a forbearance plan, a repayment plan, or a payment deferral). We may also offer loan modifications that contractually change the terms of the loan, generally after the successful completion of a three to four month trial period. Single-family loan modifications may result in the capitalization of past due amounts (a form of payment delay), an interest rate reduction, a term extension, a principal forbearance (which is another form of payment delay), or a combination thereof. During the trial period, the borrower makes reduced payments that are an estimate of the anticipated modified payment amount. Additionally, during the trial period, the mortgage loan is not contractually modified such that the loan continues to be reported as past due and the trial period is considered a form of payment delay with respect to the original contractual terms of the loan.

For multifamily borrowers, loan restructurings include short-term forbearance plans and loan modification programs, which primarily result in term extensions of up to one year with no change to the loan’s interest rate. In certain cases, we may make more significant modifications of terms for borrowers experiencing financial difficulty, such as reducing the interest rate, converting to interest-only payments, extending the maturity for longer than one year, providing principal forbearance, or some combination of these terms. In some instances when a loan is restructured, we may require additional collateral, which may take the form of a guaranty from another entity, to further mitigate the risk of nonperformance.

Our estimate of future credit losses uses a lifetime methodology, derived from modeled loan performance based on extensive historical experience of loans with similar risk characteristics, adjusted to reflect current conditions and reasonable and supportable forecasts. The historical loss experience used in our single-family and multifamily credit loss models includes the impact of the loss mitigation options provided to borrowers experiencing financial difficulty, and also includes the impact of projected loss severities as a result of a loan default.

Nonaccrual Loans and Allowance for Loan Losses

The estimated mark-to-market loan-to-value (“LTV”) ratio is a primary factor we consider when estimating our allowance for loan losses for single-family loans. As LTV ratios increase, the borrower’s equity in the home decreases, which may

negatively affect the borrower’s ability to refinance or to sell the property for an amount at or above the outstanding balance of the loan.

Nonaccrual Loans

We recognize interest income on an accrual basis except when we believe the collection of principal and interest is not reasonably assured. This generally occurs when a single-family loan is three or more months past due and a multifamily loan is two or more months past due according to its contractual terms. A loan is reported as past due if a full payment of principal and interest is not received within one month of its due date. When a loan is placed on nonaccrual status based on delinquency status, interest previously accrued but not collected on the loan is reversed through interest income.

Cost basis adjustments on HFI loans are amortized into interest income over the contractual life of the loan using the effective interest method. Cost basis adjustments on the loan are not amortized into income while a loan is on nonaccrual status. We have elected not to measure an allowance for credit losses on accrued interest receivable balances as we have a nonaccrual policy to ensure the timely reversal of unpaid accrued interest.

For single-family loans, we recognize any contractual interest payments received on the loan while on nonaccrual status as interest income on a cash basis. For multifamily loans, we account for interest income on a cost recovery basis and we apply any payment received while on nonaccrual status to reduce the amortized cost of the loan. Thus, we do not recognize any interest income on a multifamily loan placed on nonaccrual status until the amortized cost of the loan has been reduced to zero.

A nonaccrual loan is returned to accrual status when the full collection of principal and interest is reasonably assured. We generally determine that the full collection of principal and interest is reasonably assured when the loan returns to current payment status. If a loan is restructured for a borrower experiencing financial difficulty, we require a performance period of up to 6 months before we return the loan to accrual status. Upon a loan’s return to accrual status, we resume the recognition of interest income on an accrual basis and the amortization of cost basis adjustments, if any, into interest income. If interest is capitalized pursuant to a restructuring, any capitalized interest that had not been previously recognized as interest income or that had been reversed through interest income when the loan was placed on nonaccrual status is recorded as a discount to the loan and amortized into interest income over the remaining contractual life of the loan.

We maintain an allowance for loan losses for HFI loans held by Fannie Mae and by consolidated Fannie Mae MBS trusts, excluding loans for which we have elected the fair value option. When calculating our allowance for loan losses, we consider the unpaid principal balance, net of unamortized premiums and discounts, and other cost basis adjustments of HFI loans at the balance sheet date. We record write-offs as a reduction to our allowance for loan losses at the point of foreclosure, completion of a short sale, upon the redesignation of nonperforming and reperforming loans from HFI to HFS or when a loan is determined to be uncollectible.

Our benefit (provision) for loan losses can vary substantially from period to period based on a number of factors, such as changes in actual and forecasted home prices or property valuations, fluctuations in actual and forecasted interest rates, borrower payment behavior, events such as natural disasters or pandemics, the type, volume and effectiveness of our loss mitigation activities, including forbearances and loan modifications, the volume of foreclosures completed, and the volume and pricing of loans redesignated from HFI to HFS. Our benefit or provision can also be impacted by updates to the models, assumptions, and data used in determining our allowance for loan losses.

Trading and Available-for-sale Securities

Trading Securities

Trading securities are recorded at fair value with subsequent changes in fair value recorded as “Fair value gains (losses), net” in our condensed consolidated statements of operations and comprehensive income.

Available-for-Sale Securities

We record AFS securities at fair value with unrealized gains and losses, recorded net of tax, as a component of “Other comprehensive income (loss)” and we recognize realized gains and losses from the sale of AFS securities in “Investment gains (losses), net” in our condensed consolidated statements of operations and comprehensive income. We define the amortized cost basis of our AFS securities as unpaid principal balance, net of unamortized premiums and discounts, and other cost basis adjustments. We record an allowance for credit losses for AFS securities that reflects the impairment for credit losses, which are limited to the amount that fair value is less than the amortized cost. Impairment due to non-credit losses are recorded as unrealized losses within “Other comprehensive income (loss).”

Financial Guarantees

We recognize a guaranty obligation for our obligation to stand ready to perform on our guarantees to unconsolidated trusts and other guaranty arrangements. These off-balance sheet guarantees expose us to credit losses primarily relating to the unpaid principal balance of our unconsolidated Fannie Mae MBS and other financial guarantees.We measure our guaranty reserve for estimated credit losses for off-balance sheet exposures over the contractual period for which they are exposed to the credit risk, unless that obligation is unconditionally cancellable by the issuer.

Derivatives

We recognize all derivatives as either assets or liabilities in our condensed consolidated balance sheets at their fair value on a trade date basis. Fair value amounts, which are (1) netted to the extent a legal right of offset exists and is enforceable by law at the counterparty level and (2) inclusive of the right or obligation associated with the cash collateral posted or received, are recorded in “Other assets” or “Other liabilities” in our condensed consolidated balance sheets.We present cash flows from derivatives as operating activities in our condensed consolidated statements of cash flows.We record all gains and losses, including accrued interest, on derivatives while they are not in a qualifying designated hedging relationship in “Fair value gains (losses), net” in our condensed consolidated statements of operations and comprehensive income.

Derivatives, Methods of Accounting, Hedging Derivatives

Pursuant to our fair value hedge accounting program, we may designate certain interest-rate swaps as hedging instruments in hedges of the change in fair value attributable to the designated benchmark interest rate for certain closed pools of fixed-rate, single-family mortgage loans or our funding debt. For hedged items in qualifying fair value hedging relationships, changes in fair value attributable to the designated risk are recognized as a basis adjustment to the hedged item. We also report changes in the fair value of the derivative hedging instrument in the same condensed consolidated statements of operations and comprehensive income line item used to recognize the earnings effect of the hedged item’s basis adjustment.

Segment Reporting

We have two reportable business segments, which are based on the type of business activities each perform: Single-Family and Multifamily. Results of our two business segments are intended to reflect each segment as if it were a stand-alone business. The sum of the results for our two business segments equals our condensed consolidated results of operations.

Concentrations of Credit Risk

One of the measures by which management gauges our credit risk is the delinquency status of the mortgage loans in our guaranty book of business.

For single-family and multifamily loans, management uses this information, in conjunction with housing market data, other economic data, our capital requirements and our mission objectives, to help inform changes to our pricing and our eligibility and underwriting criteria. Management also uses this data together with other credit risk measures to identify key trends that guide the development of our loss mitigation strategies.

Derivatives, Offsetting

Derivative instruments are recorded at fair value and securities purchased under agreements to resell are recorded at amortized cost in our condensed consolidated balance sheets.

Fair Value Measurement

Fair value measurement guidance defines fair value, establishes a framework for measuring fair value, and sets forth disclosures around fair value measurements. This guidance applies whenever other accounting guidance requires or permits assets or liabilities to be measured at fair value. The guidance establishes a three-level fair value hierarchy that prioritizes the inputs into the valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority, Level 1, to measurements based on unadjusted quoted prices in active markets for identical assets or liabilities. The next highest priority, Level 2, is given to measurements of assets and liabilities based on limited observable inputs or observable inputs for similar assets and liabilities. The lowest priority, Level 3, is given to measurements based on unobservable inputs.

In our condensed consolidated balance sheets, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when we evaluate loans for impairment).

Fair Value Option

We generally elect the fair value option on a financial instrument when the accounting guidance would otherwise require us to separately account for a derivative that is embedded in an instrument at fair value. Under the fair value option, we carry this type of instrument, in its entirety, at fair value instead of separately accounting for the derivative.

Interest income for the mortgage loans is recorded in “Interest income: Mortgage loans” and interest expense for the debt instruments is recorded in “Interest expense: Long-term debt” in our condensed consolidated statements of operations and comprehensive income.

Fair Value of Financial Instruments

The fair value of financial instruments we disclose includes commitments to purchase multifamily and single-family mortgage loans that we do not record in our condensed consolidated balance sheets. The fair values of these commitments are included as “Mortgage loans held for investment, net of allowance for loan losses.”

Commitments and Contingencies

On a quarterly basis, we review relevant information about pending legal actions and proceedings for the purpose of evaluating and revising our contingencies, accruals and disclosures. We establish an accrual only for matters when the likelihood of a loss is probable and we can reasonably estimate the amount of such loss.