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Leases (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating leases, rent expense		$ 118	$ 126
Minimum
Lessee, Lease, Description [Line Items]
Lessee lease term	1 year
Lessor lease term	2 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee lease term	18 years
Lessor lease term	5 years

X

- Definition

Lessee, Lease, Term Of Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	fisv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessor, Operating And Sales-Type Lease, Term of Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	fisv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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