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Net Earnings (Loss) per Share - Summary of Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 341 $ 19 $ (32) $ 35
Weighted average shares outstanding-basic (in shares) 619 618 620 617
Plus: Common stock equivalent shares (in shares) 5 7 0 8
Weighted average shares outstanding-diluted (in shares) 624 625 620 625
Net earnings per share-basic attributable to FIS common stockholders (in dollars per share) $ 0.55 $ 0.03 $ (0.05) $ 0.06
Net earnings per share-diluted attributable to FIS common stockholders (in dollars per share) $ 0.55 $ 0.03 $ (0.05) $ 0.06