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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 154 $ 59 $ 548 $ 327
Weighted average shares outstanding — basic (in shares) 328 331 329 330
Plus: Common stock equivalent shares (in shares) 3 5 4 5
Weighted average shares outstanding — diluted (in shares) 331 336 333 335
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.47 $ 0.18 $ 1.67 $ 0.99
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.47 $ 0.18 $ 1.65 $ 0.98