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Debt - Short-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Short-term Debt    
Other $ 141 $ 100
Total Short-term borrowings 743 2,823
Euro Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Commercial paper $ 602 2,523
Short term debt, weighted average interest rate (0.20%)  
Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Commercial paper $ 0 $ 200
Short term debt, weighted average interest rate 0.00%