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Debt - Short-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Short-term Debt    
Other $ 163 $ 17
Total short-term borrowings 3,169 267
Euro Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Commercial paper 2,856 0
Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Commercial paper $ 150 $ 250