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Debt - Principal Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Principal maturities of long-term debt    
Total long-term debt $ 16,544 $ 17,265
FIS credit agreements    
Principal maturities of long-term debt    
2021 remaining period 33  
2022 1,644  
2023 2,257  
2024 1,350  
2025 748  
Thereafter 10,703  
Total principal payments 16,735  
Debt issuance costs, net of accumulated amortization (114)  
Total long-term debt $ 16,621