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Debt - Narrative (Details)		1 Months Ended		12 Months Ended
	Dec. 15, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 29, 2021 USD ($)	May 28, 2021 USD ($)	May 21, 2021 EUR (€)	Mar. 02, 2021 USD ($)
Debt Instrument
Weighted average interest rate				0.90%
Principal amount of debt redeemed				$ 53,440,000,000	$ 49,067,000,000	$ 24,672,000,000
Loss on extinguishment of debt				528,000,000	0	$ 217,000,000
Difference in carrying value and fair value of long term debt				570,000,000	$ 1,640,000,000
Revolving Credit Facility
Debt Instrument
Outstanding credit agreement							$ 5,500,000,000	$ 4,000,000,000
Additional term and revolving loan capacity in the future				1,365,000,000
Line of credit facility, capacity backstopped				3,810,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument
Mandatory principal payment				$ 0
Senior Notes
Debt Instrument
Senior note redemption price, percentage				100.00%
Principal amount of debt redeemed		$ 5,100,000,000
Loss on extinguishment of debt		528,000,000
Senior Notes | Minimum
Debt Instrument
Make whole amount, trigger period prior to maturity				1 month
Senior Notes | Maximum
Debt Instrument
Make whole amount, trigger period prior to maturity				6 months
FIS Credit Agreement
Debt Instrument
Unamortized discount (premium), net				$ (126,000,000)
Senior Euro Floating Rates Notes | Senior Notes
Debt Instrument
Face amount of debt | €									€ 446,000,000
Principal amount of debt redeemed		$ 66,000,000
Senior Euro Floating Rates Notes | Senior Notes | Minimum
Debt Instrument
Debt instrument, stated percentage		0.00%
Senior Euro Floating Rates Notes | Senior Notes | Maximum
Debt Instrument
Debt instrument, stated percentage		5.00%
Senior USD Notes | Senior Notes
Debt Instrument
Face amount of debt										$ 5,500,000,000
Principal amount of debt redeemed		$ 3,529,000,000
Senior USD Notes | Senior Notes | Minimum
Debt Instrument
Debt instrument, stated percentage				0.40%						0.40%
Senior USD Notes | Senior Notes | Maximum
Debt Instrument
Debt instrument, stated percentage				4.80%						3.10%
Senior Euro Notes | Senior Notes
Debt Instrument
Principal amount of debt redeemed		600,000,000
Early repayment of senior debt	$ 500,000,000
Senior Euro Notes | Senior Notes | Minimum
Debt Instrument
Debt instrument, stated percentage				0.10%
Senior Euro Notes | Senior Notes | Maximum
Debt Instrument
Debt instrument, stated percentage				3.00%
Senior GBP Notes | Senior Notes
Debt Instrument
Principal amount of debt redeemed		$ 871,000,000
Senior GBP Notes | Senior Notes | Minimum
Debt Instrument
Debt instrument, stated percentage				1.70%
Senior GBP Notes | Senior Notes | Maximum
Debt Instrument
Debt instrument, stated percentage				3.40%
Any And All Notes And Maximum Tender Offer Notes | Senior Notes
Debt Instrument
Principal amount of debt redeemed			$ 3,000,000,000
Extinguishment of tender premium			$ 217,000,000
ECP Notes | Senior Commercial Paper Notes | FIS Credit Agreement
Debt Instrument
Outstanding credit agreement				$ 4,700,000,000
USCP Notes | FIS Credit Agreement
Debt Instrument
Outstanding credit agreement				$ 5,500,000,000

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