Financial Instruments	9 Months Ended
Financial Instruments	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments Fair Value Hedges The Company holds interest rate swaps with aggregate notional amounts of $1,854 million, £925 million and €500 million at each of September 30, 2022, and December 31, 2021, converting the interest rate exposure on certain of the Company's Senior USD Notes, Senior GBP Notes and Senior Euro Notes, as applicable, from fixed to variable. These swaps are designated as fair value hedges for accounting purposes with a net liability fair value of $639 million and $85 million reflected as a decrease in the long-term debt balance at September 30, 2022, and December 31, 2021, respectively (see Note 6). Net Investment Hedges The purpose of the Company's net investment hedges, as discussed below, 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) for the change in fair value as Foreign currency translation adjustments and related income tax (expense) benefit within Other comprehensive earnings (loss), net of tax, on the consolidated statements of comprehensive earnings (loss) of $983 million and $386 million during the three months and $2,116 million and $678 million during the nine months ended September 30, 2022 and 2021, respectively. The amounts included in Accumulated other comprehensive earnings (loss) (“AOCI”) for the net investment hedges will remain in AOCI until the complete or substantially complete liquidation of our investment in the underlying foreign operations. No ineffectiveness has been recorded on the net investment hedges. Foreign Currency-Denominated Debt Designations The Company designates certain foreign currency-denominated debt as net investment hedges of its investment in Euro- and Pound Sterling-denominated operations. As of September 30, 2022, and December 31, 2021, an aggregate €7,848 million and €8,275 million, respectively, was designated as a net investment hedge of the Company's investment in Euro-denominated operations related to Senior Euro Notes with maturities ranging from 2022 to 2039 and ECP Notes. As of September 30, 2022, and December 31, 2021, an aggregate £665 million and £1,193 million, respectively, was designated as a net investment hedge of the Company's Pound Sterling-denominated operations related to the Senior GBP Notes with maturities ranging from 2029 to 2031 at September 30, 2022. Cross-Currency Interest Rate Swap Designations The Company holds cross-currency interest rate swaps and designates them as net investment hedges of its investment in Euro- and Pound Sterling-denominated operations. As of September 30, 2022, and December 31, 2021, aggregate notional amounts of €6,343 million and €5,906 million, respectively, were designated as net investment hedges of the Company's investment in Euro-denominated operations, and aggregate notional amounts of £2,386 million and £2,345 million, respectively, were designated as net investment hedges of the Company's Pound Sterling-denominated operations. The cross-currency interest rate swap fair values were net assets of $950 million at September 30, 2022, and net assets of $258 million at December 31, 2021, respectively. During the nine months ended September 30, 2022, the Company entered into transactions to cash settle existing cross-currency interest rate swaps designated as net investment hedges and received net proceeds of approximately $684 million for the fair values of the cross-currency interest rate swaps as of the termination dates. The proceeds were recorded within investing activities on the consolidated statements of cash flows. Following the settlement of the existing cross-currency interest rate swaps, the Company entered into new cross-currency interest rate swaps at current market terms with similar notional amounts and maturity dates as the settled cross-currency interest rate swaps.