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Summary of Significant Accounting Policies - Schedule of Settlement Assets and Payables (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Settlement assets
Settlement deposits	$ 353	$ 463
Settlement receivables	126	154
Total Settlement assets	479	617
Settlement payables	$ 500	$ 635

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- Definition

Settlement Assets [Abstract]

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No definition available.

+ Details

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Namespace Prefix:	fis_
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Balance Type:	na
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- Definition

Settlement Deposits, Current

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No definition available.

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

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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.

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