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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Net Earnings per Share      
Net earnings attributable to FIS common stockholders $ 298 $ 846 $ 1,261
Weighted average shares outstanding — basic (in shares) 445 328 330
Plus: Common stock equivalent shares (in shares) 6 4 6
Weighted average shares outstanding — diluted (in shares) 451 332 336
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) $ 0.67 $ 2.58 $ 3.82
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) $ 0.66 $ 2.55 $ 3.75