Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited financial information included in this report includes the accounts of FIS and its subsidiaries prepared in accordance with U.S. generally accepted accounting principles and the instructions to Form 10-Q and Article 10 of Regulation S-X. All adjustments considered necessary for a fair presentation have been included. This report should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2024. The preparation of these consolidated financial statements in conformity with United States ("U.S.") generally accepted accounting principles ("GAAP") and the related rules and regulations of the U.S. Securities and Exchange Commission ("SEC" or "Commission") requires our management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and liabilities. The inputs into management's critical and significant accounting estimates consider the economic impact of inflation and economic growth rates. These estimates may change as new events occur and additional information is obtained. Future actual results could differ materially from these estimates. To the extent that there are differences between these estimates, judgments and assumptions and actual results, our consolidated financial statements will be affected. On January 31, 2024, the Company completed the sale ("the 2024 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 2024 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 3 for information regarding the equity method investment earnings (loss), net of tax, beginning on February 1, 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 2024 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. See Note 13 for information regarding FIS entering into definitive agreements to (i) buy the Issuer Solutions business from Global Payments Inc. (“Global Payments”) and (ii) sell its remaining equity interest in Worldpay to Global Payments. Certain reclassifications have been made in the 2024 consolidated financial statements to conform to the classifications used in 2025 as described below. •Revenue related primarily to software licenses requiring frequent, integral updates was classified as Transaction processing and services revenue during the quarter ended December 31, 2024, and related prior-period amounts have been reclassified from Other recurring revenue to Transaction processing and services for comparability. See Note 5 for further information. •On the consolidated statements of cash flows, we reclassified Coupon payments on interest rate swaps from Other investing activities into its own classification. The consolidated statement of cash flows for the three months ended March 31, 2024, has been reclassified to conform to the current presentation. 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 the third quarter of 2024, the Company identified immaterial misstatements affecting the Company's previously issued consolidated financial statements as of and for the annual periods ended December 31, 2023 and 2022, and the quarterly periods ended March 31 and June 30, 2024. 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.