Financial Instruments	9 Months Ended
Financial Instruments	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments Forward Contracts During the second quarter of 2019, the Company entered into foreign currency forward exchange contracts to reduce the volatility in the Company's cash flows due to foreign exchange rate fluctuations during the period leading up to the Company’s Euro- and Pound Sterling-denominated debt issuances related to the Worldpay transaction (see Note 7 for further discussion of these debt issuances). These forward contracts were settled on July 31, 2019, resulting in a net pre-tax gain of $1 million during the three months and a net pre-tax loss of $14 million during the nine months ended September 30, 2019. As of September 30, 2019, and December 31, 2018, the Company had no significant forward contracts outstanding. Cash Flow Hedges During the second quarter of 2019, the Company entered into treasury lock and forward-starting interest rate swap contracts with total notional amounts of €1.5 billion, £500 million, and $500 million to reduce the volatility in the Company’s cash flows due to changes in the benchmark interest rates during the period leading up to the Company’s fixed-rate debt issuances related to the Worldpay transaction (see Note 7 for further discussion of these debt issuances). The Company designated these derivatives as cash flow hedges for accounting purposes. During May 2019, in conjunction with the debt issuances, the Company terminated these contracts for an aggregate cash settlement payment of $17 million, which was recorded as a component of Other comprehensive earnings on the Condensed Consolidated Statement of Comprehensive Earnings (Unaudited). The amounts in Other comprehensive earnings are reclassified as an adjustment to interest expense on the Condensed Consolidated Statement of Earnings (Unaudited) over the respective periods during which the related hedged interest payments are recognized in income, which range from four to 12 years. Settlement cash flows related to these contracts were recorded as Other financing activities, net on the Condensed Consolidated Statement of Cash Flows (Unaudited). As of September 30, 2019, and December 31, 2018, the Company had no outstanding cash flow hedge contracts. Fair Value Hedge During the fourth quarter of 2018, the Company entered into an interest rate swap with a €500 million notional value converting the interest rate exposure on the Company's 2024 Euro Notes from fixed to variable. The Company designated this interest rate swap as a fair value hedge for accounting purposes. The fair value of the interest rate swap was a $18 million asset at September 30, 2019, reflected as an increase in the hedged debt balance (see Note 7). Net Investment Hedges During the third quarter of 2019, in conjunction with the closing of the Worldpay acquisition, the Company designated certain debt issuances related to the Worldpay acquisition as net investment hedges of its investment in Euro- and Pound Sterling-denominated operations. As of September 30, 2019, an aggregate €7,616 million was designated as a net investment hedge of the Company's investment in Euro-denominated operations related to the Floating Rate Notes, May 2021 Euro Notes, 2023 Euro Notes, 2027 Euro Notes, 2030 Euro Notes, 2039 Euro Notes, and ECP Notes, and an aggregate £264 million was designated as a net investment hedge of the Company's Pound Sterling-denominated operations related to the 2031 GBP Notes. During the fourth quarter of 2018, the Company entered into cross-currency interest rate swaps with an aggregate notional amount of $716 million, which were designated as net investment hedges of its investment in Euro- and Pound Sterling-denominated operations. The fair value of the cross-currency interest rate swaps was a net $35 million asset at September 30, 2019. During the third quarter of 2017, the Company designated its 2021 Euro Notes (€500 million) and 2024 Euro Notes (€500 million) and 2022 GBP Notes (£300 million) as net investment hedges of its investment in Euro- and Pound Sterling-denominated operations, respectively. The purpose of the Company's net investment hedges is to reduce the volatility of FIS' net investment value in its Euro- and Pound Sterling-denominated operations due to changes in foreign currency exchange rates. The Company recorded net investment hedge aggregate gain (loss), net of tax, for the change in fair value as Foreign currency translation adjustments within Other comprehensive earnings on the Condensed Consolidated Statements of Comprehensive Earnings (Unaudited) of $185 million and $10 million, during the three months and $198 million and $38 million during the nine months ended September 30, 2019 and 2018, respectively. No ineffectiveness was recorded on the net investment hedges.