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Net Earnings per Share - Summary of Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 158 $ 20 $ 126 $ 54
Weighted average shares outstanding-basic (in shares) 613 620 618 618
Plus: Common stock equivalent shares (in shares) 6 7 5 8
Weighted average shares outstanding-diluted (in shares) 619 627 623 626
Net earnings per share-basic attributable to FIS common stockholders (in dollars per share) $ 0.26 $ 0.03 $ 0.20 $ 0.09
Net earnings per share-diluted attributable to FIS common stockholders (in dollars per share) $ 0.26 $ 0.03 $ 0.20 $ 0.09