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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, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Net earnings attributable to FIS common stockholders $ 15 $ 148
Weighted average shares outstanding — basic (in shares) 616 323
Plus: Common stock equivalent shares (in shares) 9 3
Weighted average shares outstanding — diluted (in shares) 625 326
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.02 $ 0.46
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.02 $ 0.45