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Condensed Consolidated Financial Statement Details - Settlement Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Settlement Assets [Abstract]
Settlement deposits	$ 349	$ 463
Settlement receivables	236	154
Total Settlement assets	$ 585	$ 617

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- Definition

Settlement Assets

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No definition available.

+ Details

Name:	fis_SettlementAssetsAbstract
Namespace Prefix:	fis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Settlement Deposits, Current

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No definition available.

+ Details

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

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- Definition

Settlement Receivables, Current

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No definition available.

+ Details

Name:	fis_SettlementReceivablesCurrent
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.

+ References

No definition available.

+ Details

Name:	us-gaap_SettlementAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant