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Debt (Short Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-term Debt    
Other $ 144 $ 100
Total Short-term borrowings $ 2,750 2,823
Senior Commercial Paper Notes | FIS Credit Agreement | ECP Notes    
Short-term Debt    
Weighted average interest rate (percent) (0.30%)  
Commercial paper $ 861 2,523
Senior Commercial Paper Notes | FIS Credit Agreement | USCP Notes    
Short-term Debt    
Weighted average interest rate (percent) 0.40%  
Commercial paper $ 1,745 $ 200