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Debt - Narrative (Details)	1 Months Ended	9 Months Ended
	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	May 21, 2021 EUR (€)	Mar. 02, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument
Debt, weighted average interest rate		0.90%
Repayments of long-term debt		$ 40,644,000,000	$ 37,646,000,000
Loss on extinguishment of debt		528,000,000	$ 0
Fair value aggregate difference		809,000,000				$ 1,640,000,000
FIS credit agreements
Debt Instrument
Unamortized discount (premium), net		(120,000,000)
Senior Euro Floating Rate Notes
Debt Instrument
Principal amount of debt | €				€ 446,000,000
Revolving Credit Facility
Debt Instrument
Borrowing capacity remaining		1,991,000,000
Line of credit facility, capacity backstopped		3,468,000,000
Credit facility outstanding amount		$ 41,000,000				$ 251,000,000
Senior notes
Debt Instrument
Repayments of long-term debt	$ 5,100,000,000
Loss on extinguishment of debt	528,000,000
Senior notes | Senior Euro Floating Rate Notes
Debt Instrument
Repayments of long-term debt	66,000,000
Senior notes | Senior USD Notes
Debt Instrument
Principal amount of debt					$ 5,500,000,000
Repayments of long-term debt	3,529,000,000
Senior notes | Senior Euro Notes
Debt Instrument
Repayments of long-term debt	600,000,000
Senior notes | Senior GBP Notes
Debt Instrument
Repayments of long-term debt	$ 871,000,000
Senior notes | Minimum | Senior Euro Floating Rate Notes
Debt Instrument
Debt instrument, stated percentage	0.00%
Senior notes | Minimum | Senior USD Notes
Debt Instrument
Debt instrument, stated percentage		0.40%			0.40%
Senior notes | Minimum | Senior Euro Notes
Debt Instrument
Debt instrument, stated percentage		0.10%
Senior notes | Minimum | Senior GBP Notes
Debt Instrument
Debt instrument, stated percentage		1.70%
Senior notes | Maximum | Senior Euro Floating Rate Notes
Debt Instrument
Debt instrument, stated percentage	5.00%
Senior notes | Maximum | Senior USD Notes
Debt Instrument
Debt instrument, stated percentage		4.80%			3.10%
Senior notes | Maximum | Senior Euro Notes
Debt Instrument
Debt instrument, stated percentage		3.00%
Senior notes | Maximum | Senior GBP Notes
Debt Instrument
Debt instrument, stated percentage		3.40%

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Fair Value, Aggregate Differences, Long-term Debt Instruments

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount (premium).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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