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Equity Method Investment - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]          
Revenue $ 2,717 $ 2,570   $ 7,865 $ 7,528
Gross profit 1,028 977   2,859 2,828
Net earnings (loss) attributable to Worldpay 265 225   (126) 1,171
FIS share of net earnings (loss) attributable to Worldpay, net of tax 264 224   (128) 1,169
Income tax (expense) benefit (87) (108)   (179) $ (215)
Worldpay Merchant Solutions          
Schedule of Equity Method Investments [Line Items]          
Revenue 1,351 1,248 $ 3,429 4,119  
Gross profit 685 718 1,771 2,018  
Earnings (loss) before income taxes (47) (99) (326) (346)  
Net earnings (loss) attributable to Worldpay (49) (160) (431) (405)  
FIS share of net earnings (loss) attributable to Worldpay, net of tax (23) (33) (110) (692)  
Income tax (expense) benefit $ (2) $ 39 $ 84 (513)  
Deferred tax expenses       $ 539