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Summary of Significant Accounting Policies - Net Income Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Weighted-average shares excluded from calculations of common stock equivalents for anti-dilutive stock options	1.1	1.1	1.3
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - basic	512.3	405.5	422.3
Common stock equivalents (in shares)	10.3	8.2	9.0
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - diluted	522.6	413.7	431.3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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