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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Earnings per Share      
Earnings from continuing operations attributable to FIS, net of tax $ 1,319 $ 567 $ 639
Earnings (loss) from discontinued operations attributable to FIS, net of tax 0 1 (7)
Net earnings attributable to FIS common stockholders $ 1,319 $ 568 $ 632
Weighted average shares outstanding — basic (in shares) 330 326 285
Plus: Common stock equivalent shares (in shares) 6 4 4
Weighted average shares outstanding — diluted (in shares) 336 330 289
Net earnings per share — basic from continuing operations attributable to FIS common stockholders (in dollars per share) $ 4.00 $ 1.74 $ 2.24
Net earnings (loss) per share — basic from discontinued operations attributable to FIS common stockholders (in dollars per share) 0.00 0.00 (0.03)
Net earnings per share — basic attributable to FIS common stockholders (in dollars per share) [1] 4.00 1.74 2.22
Net earnings per share — diluted from continuing operations attributable to FIS common stockholders (in dollars per share) 3.93 1.72 2.21
Net earnings (loss) per share — diluted from discontinued operations attributable to FIS common stockholders (in dollars per share) 0.00 0.00 (0.03)
Net earnings per share — diluted attributable to FIS common stockholders (in dollars per share) [1] $ 3.93 $ 1.72 $ 2.19
[1] Amounts may not sum due to rounding.