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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 212 $ 139 $ 394 $ 269
Weighted average shares outstanding — basic (in shares) 329 330 329 329
Plus: Common stock equivalent shares (in shares) 4 4 5 5
Weighted average shares outstanding — diluted (in shares) 333 334 334 334
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.64 $ 0.42 $ 1.20 $ 0.82
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.64 $ 0.42 $ 1.18 $ 0.81