Organization	12 Months Ended
Organization	Dec. 31, 2025
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. During the third quarter of the fiscal year 2023, the Company determined that the plan to dispose of Worldpay Merchant Solutions represented a strategic shift that would 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, as well as subsequent adjustments for the resolution of related contingencies, have been reflected as discontinued operations and, as such, have been excluded from continuing operations and segment results. 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 retained 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, in the consolidated statements of earnings (loss). The cash proceeds received by FIS, net of closing adjustments and transaction costs, are presented as investing cash flows within continuing operations in 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, 2025. On January 9, 2026, FIS completed its previously announced (i) acquisition of the Issuer Solutions business ("the "Issuer Solutions Business") from Global Payments Inc., ("Global Payments") ("the Issuer Solutions Acquisition") and (ii) sale of all of its equity interests in Worldpay (the "2026 Worldpay Minority Interest Sale"), pursuant to the transaction agreement (the "Transaction Agreement"), entered into on April 17, 2025, by and among FIS, Global Payments, Total System Services LLC, and Worldpay. FIS acquired the Issuer Solutions Business from Global Payments in exchange for FIS' minority interest in Worldpay and approximately $7.7 billion in cash, which is equal to the difference between the purchase price payable by FIS in respect of the Issuer Solutions Business and the purchase price payable by Global Payments in respect of FIS' minority interest in Worldpay. The cash payment amount is subject to customary post-closing adjustments in respect of the respective purchase price for each of Worldpay and the Issuer Solutions Business. The purchase price paid by Global Payments in respect of Worldpay was based on a $24.25 billion enterprise valuation of Worldpay, and the purchase price paid by FIS in respect of the Issuer Solutions Business was based on a $13.5 billion enterprise valuation of the Issuer Solutions Business, in each case, subject to customary adjustments for the cash, debt and working capital (relative to a target) of Worldpay and the Issuer Solutions Business, respectively, as of the closing of the transactions. We funded the Issuer Solutions Acquisition through a combination of approximately $7.7 billion of new debt and the 2026 Worldpay Minority Interest Sale. We continued to account for our non-controlling 45% equity interest in Worldpay using the equity method of accounting through the closing date of the 2026 Worldpay Minority Interest Sale. Upon closing, we expect to recognize an estimated pre-tax gain of $2.2 billion based on the excess of the net selling price over the estimated carrying value of the Worldpay equity method investment as of the date of closing, adjusted for the impact of our share of Worldpay's cumulative translation adjustments recorded in accumulated other comprehensive earnings (loss). The estimated gain remains subject to change based on customary post-closing purchase price adjustments and final determination of these amounts, and the final gain could differ materially from the current estimate. Amounts in tables in the financial statements and accompanying footnotes may not sum or calculate due to rounding.