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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 154 $ 154 $ 456 $ 548
Weighted average shares outstanding — basic (in shares) 516 328 388 329
Plus: Common stock equivalent shares (in shares) 8 3 8 4
Weighted average shares outstanding — diluted (in shares) 524 331 396 333
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.30 $ 0.47 $ 1.18 $ 1.67
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.29 $ 0.47 $ 1.15 $ 1.65