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Debt (Short Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt    
Other $ 100 $ 17
Total Short-term borrowings $ 2,823 267
Senior Commercial Paper Notes | FIS Credit Agreement | ECP Notes    
Short-term Debt    
Weighted average interest rate (percent) (0.21%)  
Commercial paper $ 2,523 0
Senior Commercial Paper Notes | FIS Credit Agreement | USCP Notes    
Short-term Debt    
Weighted average interest rate (percent) 2.05%  
Commercial paper $ 200 $ 250