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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 19 $ 154 $ 35 $ 302
Weighted average shares outstanding — basic (in shares) 618 324 617 323
Plus: Common stock equivalent shares (in shares) 7 3 8 4
Weighted average shares outstanding — diluted (in shares) 625 327 625 327
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.03 $ 0.48 $ 0.06 $ 0.93
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.03 $ 0.47 $ 0.06 $ 0.92