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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
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net earnings (loss) attributable to FIS common stockholders $ (373) $ 15
Weighted average shares outstanding — basic (in shares) 621 616
Plus: Common stock equivalent shares (in shares) 0 9
Weighted average shares outstanding — diluted (in shares) 621 625
Net earnings (loss) per share — basic attributable to FIS common stockholders (in dollars per share) $ (0.60) $ 0.02
Net earnings (loss) per share — diluted attributable to FIS common stockholders (in dollars per share) $ (0.60) $ 0.02