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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net earnings attributable to FIS common stockholders $ 182 $ 129
Weighted average shares outstanding — basic (in shares) 330 328
Plus: Common stock equivalent shares (in shares) 4 5
Weighted average shares outstanding — diluted (in shares) 334 333
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.55 $ 0.39
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.54 $ 0.39