Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are party to various types of legal actions and proceedings, including actions brought on behalf of various classes of claimants. We also are subject to regulatory examinations, inquiries and investigations, and other information gathering requests. In some of the matters, indeterminate amounts are sought. Modern pleading practice in the U.S. permits considerable variation in the assertion of monetary damages or other relief. Jurisdictions may permit claimants not to specify the monetary damages sought or may permit claimants to state only that the amount sought is sufficient to invoke the jurisdiction of the trial court. This variability in pleadings, together with our and our counsel’s actual experience in litigating or settling claims, leads us to conclude that the monetary relief that may be sought by plaintiffs bears little relevance to the merits or disposition value of claims. Legal actions and proceedings of all types are subject to many uncertain factors that generally cannot be predicted with assurance. Accordingly, the outcome of any given matter and the amount or range of potential loss at particular points in time is frequently difficult to ascertain. Uncertainties can include how fact finders will evaluate documentary evidence and the credibility and effectiveness of witness testimony, and how the court will apply the law. Disposition valuations are also subject to the uncertainty of how opposing parties and their counsel may view the evidence and applicable law. On a quarterly basis, we review relevant information about all 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. We are often unable to estimate the possible losses or ranges of losses, particularly for proceedings that are in their early stages of development, where plaintiffs seek indeterminate or unspecified damages, where there may be novel or unsettled legal questions relevant to the proceedings, or where settlement negotiations have not occurred or progressed. Given the uncertainties involved in any action or proceeding, regardless of whether we have established an accrual, the ultimate resolution of certain of these matters may be material to our operating results for a particular period, depending on, among other factors, the size of the loss or liability imposed and the level of our net income or loss for that period. In addition to the matters specifically described below, we are involved in a number of legal and regulatory proceedings that arise in the ordinary course of business that we do not expect will have a material impact on our business or financial condition. Senior Preferred Stock Purchase Agreements Litigation A consolidated class action (“In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations”) and a non-class action lawsuit, Fairholme Funds v. FHFA, filed by Fannie Mae and Freddie Mac shareholders against us, FHFA as our conservator, and Freddie Mac are pending in the U.S. District Court for the District of Columbia. The lawsuits challenge the August 2012 amendment to each company’s senior preferred stock purchase agreement with Treasury.Plaintiffs in these lawsuits allege that the net worth sweep dividend provisions of the senior preferred stock that were implemented pursuant to the August 2012 amendments nullified certain of the shareholders’ rights and caused them harm. Plaintiffs in the class action represent a class of Fannie Mae preferred shareholders and classes of Freddie Mac common and preferred shareholders. On September 23, 2022, the court issued a summary judgment ruling that permitted the plaintiffs in these lawsuits to present to a jury their claims for breach of the implied covenant of good faith and fair dealing. The cases were consolidated for trial and a trial commenced on October 17, 2022, but resulted in a mistrial after the jury could not reach a verdict. A second trial commenced on July 24, 2023. On August 14, 2023, the jury returned a verdict for the plaintiffs and awarded damages of $299.4 million to Fannie Mae preferred shareholders. On October 24, 2023, the court awarded these shareholders prejudgment interest on the damage award, to be determined as simple interest, accruing from August 17, 2012 until the date on which judgment is entered at a fixed rate of 5% over the Federal Reserve discount rate as of August 17, 2012. We have determined the prejudgment interest through September 30, 2023 is $192 million. The parties will have an opportunity to file an appeal. We evaluated the jury verdict and the court’s award of prejudgment interest and have established an accrual for each, reflected as expense in “Other expenses, net” for the three months ended September 30, 2023.