Organization	12 Months Ended
Organization	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization FIS is a leading global provider of financial services technology solutions for financial institutions, businesses and developers. We improve the digital transformation of our financial economy, advancing the way the world pays, banks and invests. On January 31, 2024, the Company completed the sale (the "Worldpay Sale") of a 55% equity interest in its Worldpay Merchant Solutions business to private equity funds managed by GTCR, LLC (such funds, the "Buyer"). FIS retains a non-controlling 45% equity interest in a new standalone joint venture, Worldpay Holdco, LLC ("Worldpay"), following the closing of the Worldpay Sale. FIS' share of the net income (loss) of Worldpay is reported as equity method investment earnings (loss), net of tax. The net cash proceeds received by FIS, net of estimated closing adjustments and transaction costs, are presented as investing cash flows within continuing operations on the consolidated statement of cash flows. See Note 4 for information regarding the equity method investment earnings (loss), net of tax, for the period from February 1, 2024, through December 31, 2024. During the third quarter of fiscal year 2023, the Company analyzed quantitative and qualitative factors relevant to the Worldpay Merchant Solutions disposal group in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 205-20 and determined that the accounting criteria to be classified as held for sale were met, when a definitive purchase agreement was signed. Accordingly, the assets and liabilities of the disposal group are presented separately on the consolidated balance sheets for all periods presented. In addition, the disposition represents a strategic shift that will have a major impact on the Company's operations and financial results. As a result, the operating results of the Worldpay Merchant Solutions business prior to the closing of the Worldpay Sale have been reflected as discontinued operations for all periods presented and as such, have been excluded from continuing operations and segment results. The Worldpay Merchant Solutions business included the former Merchant Solutions segment in addition to a business previously included in the Corporate and Other segment, which have been reflected as discontinued operations for all periods presented. Accordingly, the Company no longer reports the Merchant Solutions segment; it now reports its financial performance based on the following segments: Banking Solutions ("Banking"), Capital Market Solutions ("Capital Markets") and Corporate and Other. As a result of its ongoing portfolio assessments, the Company reclassified certain businesses from Capital Markets to Banking and to Corporate and Other during the quarter ended March 31, 2023, and reclassified certain non-strategic operations from Banking to Corporate and Other during the quarter ended December 31, 2023. The Company recast all prior-period segment information presented to reflect these reclassifications. See Note 22 for more information regarding our segments. Amounts in tables in the financial statements and accompanying footnotes may not sum or calculate due to rounding. Revision of Prior-Period Consolidated Financial Statements During 2024, the Company identified immaterial misstatements affecting its previously issued consolidated financial statements as of and for the annual periods ended December 31, 2023 and 2022. The misstatements related primarily to the timing of the recognition of expenses associated with inventory-related accruals, along with their related balance sheet impacts, and the presentation of certain value-added tax balances in the consolidated financial statements. The Company has revised its prior-period financial statements to correct these misstatements, as well as other unrelated immaterial misstatements, including adjustments to Revenue and Other income (expense), net. The revisions ensure comparability across all periods reflected herein. A summary of the revisions to the previously reported financial statements is provided in Note 24.