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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, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Earnings per Share                      
Net earnings (loss) from continuing operations attributable to FIS $ 304 $ 246 $ 237 $ (1) $ 61 $ 248 $ 86 $ 108 $ 787 $ 502 $ 576
Net earnings (loss) from discontinued operations attributable to FIS (23) (22) 1 707 187 (709) (6,680) 44 663 (7,157) (17,328)
Net earnings (loss) attributable to FIS $ 281 $ 224 $ 238 $ 706 $ 248 $ (461) $ (6,594) $ 152 $ 1,450 $ (6,655) $ (16,752)
Weighted average shares outstanding-basic (in shares) 536 545 554 576 589 592 592 592 553 591 604
Plus: Common stock equivalent shares (in shares)                 2 0 0
Weighted average shares outstanding-diluted (in shares) 540 548 557 578 591 592 592 593 555 591 604
Net earnings (loss) per share-basic from continuing operations attributable to FIS (in dollars per share) $ 0.57 $ 0.45 $ 0.43 $ 0 $ 0.10 $ 0.42 $ 0.15 $ 0.18 $ 1.42 $ 0.85 $ 0.95
Net earnings (loss) per share-basic from discontinued operations attributable to FIS (in dollars per share)                 1.20 (12.11) (28.69)
Basic earnings (loss) per common share attributable to FIS (in dollars per share)                 2.62 (11.26) (27.74)
Net earnings (loss) per share-diluted from continuing operations attributable to FIS (in dollars per share) $ 0.56 $ 0.45 $ 0.43 $ 0 $ 0.10 $ 0.42 $ 0.15 $ 0.18 1.42 0.85 0.95
Net earnings (loss) per share-diluted from discontinued operations attributable to FIS (in dollars per share)                 1.19 (12.11) (28.69)
Diluted earnings (loss) per common share attributable to FIS (in dollars per share)                 $ 2.61 $ (11.26) $ (27.74)