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Debt - Short-term Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Short-term Debt    
Other $ 99 $ 100
Total Short-term borrowings $ 3,217 2,823
Euro Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Short term debt, weighted average interest rate 0.20%  
Maturities 183 days  
Commercial paper $ 2,468 2,523
Commercial Paper Program | Commercial paper | FIS Credit Agreements    
Short-term Debt    
Short term debt, weighted average interest rate 0.40%  
Maturities 397 days  
Commercial paper $ 650 $ 200