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Net Earnings (Loss) per Share - Schedule of Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net earnings (loss) attributable to FIS common stockholders $ 120 $ (373)
Weighted average shares outstanding-basic (in shares) 610 621
Plus: Common stock equivalent shares (in shares) 4 0
Weighted average shares outstanding-diluted (in shares) 614 621
Net earnings (loss) per share-basic attributable to FIS common stockholders (in dollars per share) $ 0.20 $ (0.60)
Net earnings (loss) per share-diluted attributable to FIS common stockholders (in dollars per share) $ 0.20 $ (0.60)