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Shares Used in Computing Net Income (Loss) Per Share Attributable to Fiserv, Inc.
 9 Months Ended
Sep. 30, 2026
Earnings Per Share [Abstract]  
Shares Used in Computing Net Income (Loss) Per Share Attributable to Fiserv, Inc. Shares Used in Computing Net Income (Loss) Per Share Attributable to Fiserv, Inc.
The computation of shares used in calculating basic and diluted net income (loss) per share is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2026202520262025
Weighted-average common shares outstanding used for the calculation of net income (loss) attributable to Fiserv, Inc. per share - basic531.8 540.2 532.9 550.8 
Common stock equivalents— 1.6 — 2.2 
Weighted-average common shares outstanding used for the calculation of net income (loss) attributable to Fiserv, Inc. per share - diluted531.8 541.8 532.9 553.0 
For the three months ended September 30, 2026 and 2025, restricted stock units for 7.1 million and 1.3 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, 2026 and 2025, restricted stock units for 5.9 million and 956 thousand shares, respectively, were excluded from the calculation of weighted-average outstanding shares - diluted because their impact was anti-dilutive.