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Employee Benefit Plans (Narratives) (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended
	Jul. 31, 2019	Nov. 30, 2015	May 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2013
Share-based Compensation
Employer matching contribution, percent of match (percent)				50.00%
Profit sharing expenses				$ 91	$ 82	$ 80
Employee contribution of pretax annual compensation (percent)				40.00%
Employee matching contribution, percent of employees' gross pay (percent)				6.00%
Weighted average fair value of options granted (in dollars per share)				$ 19.25	$ 16.07	$ 12.78
Total unrecognized compensation cost related to non-vested stock awards				$ 343	$ 106
Weighted average period over which compensation cost is expected to be recognized				1 year 10 months 24 days	1 year 6 months
Selling, General and Administrative Expenses
Share-based Compensation
Compensation expense				$ 402	$ 84	$ 107
FIS Plan amended and restated
Share-based Compensation
Shares available for grant, ending (in shares)				36,000,000
FIS Plan amended and restated | Minimum
Share-based Compensation
Participant earning potential of target common stock (percent)				0.00%
FIS Plan amended and restated | Maximum
Share-based Compensation
Participant earning potential of target common stock (percent)				300.00%
FIS Plan amended and restated | Worldpay
Share-based Compensation
Number of additional shares authorized (in shares)	7,000,000
WP Plan | Worldpay
Share-based Compensation
Number of additional shares authorized (in shares)	24,000,000
Stock Options
Share-based Compensation
Minimum percentage contribution made by employees of their salary to employee benefit plan (percent)				3.00%
Maximum percentage contribution made by employees of their salary to employee benefit plan (percent)				15.00%
Employer matching contribution, percent of match (percent)				25.00%
Profit sharing expenses				$ 15	14	14
Number of additional shares authorized (in shares)		10,000,000
Vesting period (years)				3 years
Intrinsic value of options exercised				$ 189	$ 257	$ 196
Closing stock price (in dollars per share)				$ 139.09
Granted (in shares)				1,000,000	1,000,000	4,000,000
Granted (weighted average exercise price)				$ 113.48	$ 96.49	$ 80.05
Risk free interest rate (percent)				2.20%	2.50%	1.80%
Volatility (percent)				20.10%	19.20%	20.10%
Dividend yield (percent)				1.20%	1.30%	1.40%
Weighted average expected life (years)				4 years 1 month 6 days	4 years 2 months 12 days	4 years 2 months 12 days
Stock Options | Worldpay
Share-based Compensation
Weighted average fair value of options granted (in dollars per share)				$ 71.05
Risk free interest rate (percent)				1.90%
Volatility (percent)				18.60%
Dividend yield (percent)				1.00%
Weighted average expected life (years)				3 years 10 months 24 days
Stock Options | FIS Plan amended and restated
Share-based Compensation
Number of additional shares authorized (in shares)			12,000,000				6,000,000
Restricted Stock
Share-based Compensation
Vesting period (years)				3 years
Restricted stock, shares granted (in shares)				2,000,000	1,000,000	1,000,000
Restricted stock weighted average grant price (in dollars per share)				$ 124,720,000
Fair value of vested stock				$ 169	$ 97	$ 142
Restricted Stock | Minimum
Share-based Compensation
Restricted stock weighted average grant price (in dollars per share)				$ 124.72	$ 96.50	$ 80.12

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