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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
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net Earnings per Share                      
Net earnings (loss) from continuing operations attributable to FIS $ 511 $ 264 $ (470) $ 77 $ 304 $ 246 $ 237 $ (1) $ 382 $ 787 $ 502
Net earnings (loss) from discontinued operations attributable to FIS 0 0 0 0 (23) (22) 1 707 0 663 (7,157)
Net earnings (loss) attributable to FIS $ 511 $ 264 $ (470) $ 77 $ 281 $ 224 $ 238 $ 706 $ 382 $ 1,450 $ (6,655)
Weighted average shares outstanding-basic (in shares) 517 521 525 528 536 545 554 576 523 553 591
Plus: Common stock equivalent shares (in shares)                 2 2 0
Weighted average shares outstanding-diluted (in shares) 519 523 525 531 540 548 557 578 525 555 591
Net earnings (loss) per share-basic from continuing operations attributable to FIS (in dollars per share) $ 0.99 $ 0.51 $ (0.90) $ 0.15 $ 0.57 $ 0.45 $ 0.43 $ 0 $ 0.73 $ 1.42 $ 0.85
Net earnings (loss) per share-basic from discontinued operations attributable to FIS (in dollars per share)                 0 1.20 (12.11)
Basic earnings (loss) per common share attributable to FIS (in dollars per share)                 0.73 2.62 (11.26)
Net earnings (loss) per share-diluted from continuing operations attributable to FIS (in dollars per share) $ 0.98 $ 0.50 $ (0.90) $ 0.15 $ 0.56 $ 0.45 $ 0.43 $ 0 0.73 1.42 0.85
Net earnings (loss) per share-diluted from discontinued operations attributable to FIS (in dollars per share)                 0 1.19 (12.11)
Diluted earnings (loss) per common share attributable to FIS (in dollars per share)                 $ 0.73 $ 2.61 $ (11.26)