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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, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net earnings (loss) from continuing operations attributable to FIS $ 77 $ (1)
Net earnings (loss) from discontinued operations attributable to FIS 0 707
Net earnings (loss) attributable to FIS $ 77 $ 706
Weighted average shares outstanding-basic (in shares) 528 576
Plus: Common stock equivalent shares (in shares) 3 2
Weighted average shares outstanding-diluted (in shares) 531 578
Net earnings (loss) per share-basic from continuing operations attributable to FIS (in dollars per share) $ 0.15 $ 0
Net earnings (loss) per share-basic from discontinued operations attributable to FIS (in dollars per share) 0 1.23
Basic earnings (loss) per common share attributable to FIS, total (in dollars per share) 0.15 1.23
Net earnings (loss) per share-diluted from continuing operations attributable to FIS (in dollars per share) 0.15 0
Net earnings (loss) per share-diluted from discontinued operations attributable to FIS (in dollars per share) 0 1.22
Diluted earnings (loss) per common share attributable to FIS, total (in dollars per share) $ 0.15 $ 1.22