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Intangible Assets - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Accelerated amortization expense	$ 56

X

- Definition

Restructuring And Related Cost, Accelerated Amortization

+ References

No definition available.

+ Details

Name:	fisv_RestructuringAndRelatedCostAcceleratedAmortization
Namespace Prefix:	fisv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration