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Summary of Significant Accounting Policies - Schedule of Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Earnings per Share      
Net earnings attributable to FIS common stockholders $ 417 $ 158 $ 298
Weighted average shares outstanding — basic (in shares) 616 619 445
Plus: Common stock equivalent shares (in shares) 5 8 6
Weighted average shares outstanding — diluted (in shares) 621 627 451
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.68 $ 0.26 $ 0.67
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.67 $ 0.25 $ 0.66