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Acquisitions (Unaudited Pro Forma Results of Operations) (Details) - Worldpay - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Revenue $ 12,724 $ 12,373
Net earnings (loss) attributable to FIS common stockholders $ 254 $ (57)
Net earnings (loss) per share — basic attributable to FIS common stockholders (usd per share) $ 0.41 $ (0.09)
Net earnings (loss) per share — diluted attributable to FIS common stockholders (usd per share) $ 0.41 $ (0.09)