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Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc.
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc. Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc.
The computation of shares used in calculating basic and diluted net income per share is as follows:
 Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2023202220232022
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - basic
606.2 639.6 616.2 645.2 
Common stock equivalents4.1 5.4 4.1 5.8 
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - diluted
610.3 645.0 620.3 651.0 
For the three months ended September 30, 2023 and 2022, stock options for 0.1 million and 1.6 million shares, respectively, were excluded from the calculation of weighted-average outstanding shares - diluted because their impact was anti-dilutive. For the nine months ended September 30, 2023 and 2022, stock options for 0.9 million and 1.8 million shares, respectively, were excluded from the calculation of weighted-average outstanding shares - diluted because their impact was anti-dilutive.