Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Securities and Shareholder Matters On March 6, 2023, a putative class action was filed in the United States District Court for the Middle District of Florida by a shareholder of the Company. The action was consolidated with another action and the consolidated case is now captioned In re Fidelity National Information Services, Inc. Securities Litigation. A lead plaintiff has been appointed, and a consolidated amended complaint was filed on August 2, 2023. The consolidated amended complaint names the Company and certain of its current and former officers as defendants and seeks damages for alleged violations of federal securities laws in connection with our disclosures relating to our Merchant Solutions segment, including with respect to Worldpay's valuation, integration, and synergies. Defendants filed a motion to dismiss the consolidated amended complaint with prejudice on September 22, 2023. We intend to vigorously defend this case, but no assurance can be given as to the ultimate outcome. On April 27, 2023, a shareholder derivative action captioned Portia McCollum, derivatively on behalf of Fidelity National Information Services, Inc. v. Gary Norcross et al., was filed in the same court by a stockholder of the Company. Plaintiff dismissed the suit without prejudice and sent a demand pursuant to Georgia Code § 14-2-742. Another stockholder, City of Hialeah Employees' Retirement System, sent a similar demand. The demands claim that FIS officers and directors violated federal securities laws and breached fiduciary duties, including with respect to Worldpay's valuation, integration, and synergies, and they demand that the Board investigate and commence legal proceedings against officers and directors in connection with the purported wrongdoing. On August 25, 2023, the Board established a Demand Review Committee to consider the demands and make recommendations to the Board with respect to the demands, and the Demand Review Committee has hired independent counsel. The Board has made no final decision with respect to the demands and has not rejected the demands. On October 18, 2023, a shareholder derivative action captioned City of Hialeah Employees' Retirement System v. Stephanie L. Ferris et al. was filed in the same court by one of the stockholders that previously had sent a demand. The complaint, which names certain of the Company's current and former officers and directors as defendants, seeks to assert claims on behalf of the Company for violations of federal securities laws, breach of fiduciary duty, unjust enrichment, and contribution and indemnification, including with respect to Worldpay's valuation, integration, and synergies. The Board has instructed the Company to move to stay or dismiss the action without prejudice pending the completion of the Board's consideration of the demands. Brazilian Tax Authorities Claims In 2004, Proservvi Empreendimentos e Servicos, Ltda., the predecessor to Fidelity National Servicos de Tratamento de Documentos e Informatica Ltda. ("Servicos"), a subsidiary of Fidelity National Participacoes Ltda., our former item processing and remittance services operation in Brazil, acquired certain assets and employees and leased certain facilities from the Transpev Group ("Transpev") in Brazil. Transpev's remaining assets were later acquired by Prosegur, an unrelated third party. When Transpev discontinued its operations after the asset sale to Prosegur, it had unpaid federal taxes and social contributions owing to the Brazilian tax authorities. The Brazilian tax authorities brought a claim against Transpev and, beginning in 2012, brought claims against Prosegur and Servicos on the grounds that Prosegur and Servicos were successors in interest to Transpev. To date, the Brazilian tax authorities filed 18 claims against Servicos, of which 16 are still active, asserting potential tax liabilities of approximately $13 million. There are potentially 20 additional claims against Transpev/Prosegur for which Servicos is named as a co-defendant or may be named but for which Servicos has not yet been served. These additional claims amount to approximately $32 million, making the total potential exposure for all 36 claims approximately $45 million. We do not believe a liability for these 36 total claims is probable and, therefore, have not recorded a liability for any of these claims. Indemnifications and Warranties The Company generally indemnifies its clients, subject to certain limitations and exceptions, against damages and costs resulting from claims of patent, copyright, or trademark infringement associated solely with its customers' use of the Company's software applications or services. Historically, the Company has not made any material payments under such indemnifications but continues to monitor the conditions that are subject to the indemnifications to identify whether it is probable that a loss has occurred, in which case it would recognize any such losses when they are estimable. In addition, the Company warrants to customers that its software operates substantially in accordance with the software specifications. Historically, no material costs have been incurred related to software warranties, and no accruals for warranty costs have been made.