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Segment Information - (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) country	Mar. 31, 2018 USD ($)
Geographic distribution, foreign
Segment Reporting Information
Long-term assets, excluding goodwill and other intangible assets	$ 701	$ 577
Worldpay
Segment Reporting Information
Consolidation and other cost	$ 8
SunGard
Segment Reporting Information
Acquisition, integration and other costs		$ 57
GFS
Segment Reporting Information
Number of countries we operate in (more than) | country	130

X

- Definition

Consolidation Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	fis_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Long-term Assets, Excluding Goodwill and Other Intangible Assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	fis_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fis_WorldpayMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fis_SunGardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: