Commitments, Contingencies and Guarantees	12 Months Ended
Commitments, Contingencies and Guarantees	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees Commitments When we approve a Private Education Loan at the beginning of an academic year, that approval may cover the borrowing for the entire academic year. As such, we do not always disburse the full amount of the loan at the time of such approval, but instead have a commitment to fund a portion of the loan at a later date (usually at the start of the second semester or subsequent trimesters). We estimate expected credit losses over the contractual period that we are exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by us. At December 31, 2023, we had $2.2 billion of outstanding contractual loan commitments which we expect to fund during the remainder of the 2023/2024 academic year. At December 31, 2023, we had a $113 million reserve recorded in “Other Liabilities” to cover expected losses that may occur during the one-year loss emergence period on these unfunded commitments. See Notes to Consolidated Financial Statements, Note 2,“Significant Accounting Policies - Allowance for Credit Losses — Off-Balance Sheet Exposure for Contractual Loan Commitments” in this Form 10-K and Note 8, “Unfunded Loan Commitments” in this Form 10-K for additional information. Regulatory Matters In May 2014, the Bank received a Civil Investigative Demand (“CID”) from the CFPB as part of the CFPB’s separate investigation relating to customer complaints, fees, and charges assessed in connection with the servicing of student loans and related collection practices of pre-Spin-Off SLM by entities now subsidiaries of Navient during a time period prior to the Spin-Off (the “CFPB Investigation”). To the extent requested, the Bank has been cooperating fully with the CFPB. Given the timeframe covered by the CID and the CFPB Investigation, and the focus on practices and procedures previously conducted by Navient and its servicing subsidiaries prior to the Spin-Off, Navient is leading the response to these investigations. Consequently, we have no basis from which to estimate either the duration or ultimate outcome of this investigation. We note that on January 18, 2017, the CFPB filed a complaint in federal court in Pennsylvania against Navient, along with its subsidiaries, Navient Solutions, Inc. and Pioneer Credit Recovery, Inc. The complaint alleges these Navient entities, among other things, engaged in deceptive practices with respect to their historic servicing and debt collection practices. Neither SLM, the Bank, nor any of their current subsidiaries are named in, or otherwise a party to, the lawsuit and are not alleged to have engaged in any wrongdoing. The CFPB’s complaint asserts Navient’s assumption of these liabilities pursuant to the Separation and Distribution Agreement. Pursuant to the terms of the Separation and Distribution Agreement, and as contemplated by the structure of the Spin-Off, Navient is legally obligated to indemnify the Bank against all claims, actions, damages, losses, or expenses that may arise from the conduct of all activities of pre-Spin-Off SLM occurring prior to the Spin-Off, except for certain liabilities related to the conduct of the pre-Spin-Off consumer banking business that were specifically assumed by the Bank (and as to which the Bank is obligated to indemnify Navient). Navient has acknowledged its indemnification obligations under the Separation and Distribution Agreement, in connection with the previously disclosed investigation matters and the now resolved multistate litigation. Navient has informed the Bank, however, that it believes the Bank may be responsible to indemnify Navient against certain potential liabilities arising from the above-described lawsuits under the Separation and Distribution Agreement and/or a separate loan servicing agreement between the parties, and has suggested that the parties defer further discussion regarding indemnification obligations, and reimbursement of ongoing legal costs, in connection with the lawsuits. The Bank disagrees with Navient’s position and the Bank has reiterated to Navient that Navient is responsible for promptly indemnifying the Bank against all liabilities arising out of the conduct of pre-Spin-Off SLM that are at issue. Contingencies In the ordinary course of business, we and our subsidiaries are routinely defendants in or parties to pending and threatened legal actions and proceedings, including actions brought on behalf of various classes of claimants. These actions and proceedings may be based on alleged violations of consumer protection, securities, employment, and other laws. In certain of these actions and proceedings, claims for substantial monetary damage may be asserted against us and our subsidiaries. It is common for the Company, our subsidiaries, and affiliates to receive information and document requests and investigative demands from state attorneys general, legislative committees, and administrative agencies. These requests may be for informational or regulatory purposes and may relate to our business practices, the industries in which we operate, or other companies with whom we conduct business. Our practice has been and continues to be to cooperate with these bodies and be responsive to any such requests. We are required to establish reserves for litigation and regulatory matters where those matters present loss contingencies that are both probable and estimable. When loss contingencies are not both probable and estimable, we do not establish reserves. Based on current knowledge, management does not believe there are loss contingencies, if any, arising from pending investigations, litigation, or regulatory matters for which reserves should be established.