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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net earnings attributable to FIS common stockholders $ 20 $ 154 $ 54 $ 456
Weighted average shares outstanding — basic (in shares) 620 516 618 388
Plus: Common stock equivalent shares (in shares) 7 8 8 8
Weighted average shares outstanding — diluted (in shares) 627 524 626 396
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.03 $ 0.30 $ 0.09 $ 1.18
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.03 $ 0.29 $ 0.09 $ 1.15