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Acquisitions - Pro Forma Combined Financial Information (Details) - First Data - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total revenue	$ 3,935	$ 3,772	$ 11,730	$ 11,343
Net income	306	434	939	851
Net income attributable to Fiserv, Inc.	$ 284	$ 405	$ 847	$ 766
Net income per share attributable to Fiserv, Inc., Basic (in dollars per share)	$ 0.42	$ 0.59	$ 1.25	$ 1.10
Net income per share attributable to Fiserv, Inc., Diluted (in dollars per share)	$ 0.41	$ 0.57	$ 1.22	$ 1.08

X

- Definition

Business Acquisition, Pro Forma Income (Loss), Including Portion Attributable To Noncontrolling Interest

+ References

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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