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Summary of Significant Accounting Policies - Schedule of Settlement Assets and Payables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Settlement assets
Settlement deposits	$ 463	$ 439
Settlement receivables	154	153
Total Settlement assets	617	592
Settlement payables	$ 635	$ 613

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- Definition

Settlement Assets [Abstract]

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No definition available.

+ Details

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- Definition

Settlement Deposits, Current

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No definition available.

+ Details

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Namespace Prefix:	fis_
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- Definition

Settlement Receivables, Current

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No definition available.

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Namespace Prefix:	fis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Cash received or short term receivables for unsettled money transfers, money orders, consumer payments, or business to business payments. Settlement assets include clearing and settling customers payments due to and from financial institutions and may include cash and cash equivalents.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Amounts payable for money transfers, money orders, and consumer payment service arrangements. Settlement liabilities include amounts payable to intermediaries for global payment transfers.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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