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Equity Method Investment - Schedule of Equity Method Investments Statement of Earnings (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 11 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, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]                        
Revenue $ 2,812 $ 2,717 $ 2,616 $ 2,532 $ 2,599 $ 2,570 $ 2,490 $ 2,468   $ 10,677 $ 10,127 $ 9,831
Gross profit 1,076 1,028 952 879 977 977 944 909   3,936 3,804 3,656
Net earnings (loss) attributable to Worldpay 512 265 (469) 78 282 225 239 707   385 1,453 (6,648)
FIS share of net earnings (loss) attributable to Worldpay, net of tax $ 511 $ 264 $ (470) $ 77 $ 281 $ 224 $ 238 $ 706   382 1,450 (6,655)
Provision (benefit) for income taxes                   265 $ 362 $ 157
Worldpay Merchant Solutions                        
Schedule of Equity Method Investments [Line Items]                        
Revenue                 $ 4,732 5,476    
Gross profit                 2,422 2,687    
Earnings (loss) before income taxes                 (342) (434)    
Net earnings (loss) attributable to Worldpay                 (444) (496)    
FIS share of net earnings (loss) attributable to Worldpay, net of tax                 (145) (526)    
Provision (benefit) for income taxes                 $ 67 (307)    
Increase in deferred liabilities                   $ 383