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Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc. (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Computation of shares used in calculating basic and diluted net income per common share | The computation of shares used in calculating basic and diluted net income per common share is as follows:
| Three Months Ended March 31,
(In millions) | 2020 |  | 2019
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - basic | 678.1 |  |  | 391.7 |
Common stock equivalents | 13.1 |  |  | 7.4 |
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - diluted | 691.2 |  |  | 399.1 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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