Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
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, 2019. The preparation of these consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and 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.
Segments	FIS reports its financial performance based on the following segments: Merchant Solutions, Banking Solutions, Capital Market Solutions, and Corporate and Other. As FIS continues to execute on its integration workflows and optimize its portfolio of assets, it reclassified certain non-strategic businesses from the Merchant Solutions and Banking Solutions segments into the Corporate and Other segment in the quarter ended March 31, 2020, and recast all prior-period segment information presented. These operations represented less than 2% of first quarter 2020 revenue.
Change in Accounting Policy	The Company adopted FASB Accounting Standards Codification ("ASC") Topic 326, Financial Instruments - Credit Losses ("Topic 326"), with an adoption date of January 1, 2020. As a result, the Company changed its accounting policy for allowance for credit losses. The accounting policy pursuant to Topic 326 for credit losses is disclosed below. The adoption of Topic 326 resulted in an immaterial cumulative effect adjustment recorded in retained earnings as of January 1, 2020.
Allowance for Credit Losses	The Company monitors trade receivable balances including contract assets as well as other receivables and estimates the allowance for lifetime expected credit losses. Estimates of expected credit losses are based on historical collection experience and other factors, including those related to current market conditions and events.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2020

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, 2019. The preparation of these consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and 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.

Segments

FIS reports its financial performance based on the following segments: Merchant Solutions, Banking Solutions, Capital Market Solutions, and Corporate and Other. As FIS continues to execute on its integration workflows and optimize its portfolio of assets, it reclassified certain non-strategic businesses from the Merchant Solutions and Banking Solutions segments into the Corporate and Other segment in the quarter ended March 31, 2020, and recast all prior-period segment information presented. These operations represented less than 2% of first quarter 2020 revenue.

Change in Accounting Policy

The Company adopted FASB Accounting Standards Codification ("ASC") Topic 326, Financial Instruments - Credit Losses ("Topic 326"), with an adoption date of January 1, 2020. As a result, the Company changed its accounting policy for allowance for credit losses. The accounting policy pursuant to Topic 326 for credit losses is disclosed below. The adoption of Topic 326 resulted in an immaterial cumulative effect adjustment recorded in retained earnings as of January 1, 2020.

Allowance for Credit Losses

The Company monitors trade receivable balances including contract assets as well as other receivables and estimates the allowance for lifetime expected credit losses. Estimates of expected credit losses are based on historical collection experience and other factors, including those related to current market conditions and events.