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Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc. - Schedule of Weighted-Average Number of Shares (Details) - shares
shares in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share – basic (in shares) 590.9 626.9
Common stock equivalents (in shares) 3.9 4.4
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share – diluted (in shares) 594.8 631.3