Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2024
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, 2023. 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 and liabilities and the related disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported periods. 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 previously announced 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% ownership 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 the equity method investment earnings (loss), net of tax, for the the period from February 1 through March 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 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 13 for more information regarding our segments. Certain reclassifications have been made in the 2023 consolidated financial statements to conform to the classifications used in 2024. The consolidated statements of cash flows for the three months ended March 31, 2024, are presented on a continuing operations basis, with summarized cash flows from discontinued operations for operating, investing and financing activities shown separately. The consolidated statement of cash flows for the three months ended March 31, 2023, has been reclassified to conform to the 2024 presentation. Amounts in tables in the financial statements and accompanying footnotes may not sum or calculate due to rounding.