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Employee Benefit Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2021	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation
Employer matching contribution, percent of match										50.00%
Profit sharing expenses										$ 106	$ 109	$ 97
Discontinued operations										$ 29	25	21
Employee contribution of pretax annual compensation										40.00%
Employee matching contribution, percent of employees' gross pay										6.00%
Earnings (loss) from discontinued operations, net of tax		$ 188	$ (708)	$ (6,679)	$ 45	$ (17,473)	$ 32	$ 119	$ 0	$ (7,153)	$ (17,324)	$ 102
Weighted average fair value of options granted (in dollars per share)										$ 12.91	$ 20.89	$ 29.01
Stock-based compensation, primarily from certain performance-based awards										$ 34	$ 26	$ 100
Total unrecognized compensation cost related to non-vested stock awards		$ 219				$ 179				219	179
Unrecognized compensation costs										$ 166	$ 136
Weighted average period over which compensation cost is expected to be recognized										1 year 4 months 24 days	1 year 6 months
Selling, General and Administrative Expenses
Share-based Compensation
Stock-based compensation, primarily from certain performance-based awards										$ 120	$ 189	283
FIS Plan Amended and Restated
Share-based Compensation
Shares available for grant, ending (in shares)		24,000,000								24,000,000
Qualified Retirement Equity Program
Share-based Compensation
Accelerated stock compensation expense	$ 69									$ 69
Earnings (loss) from discontinued operations, net of tax	$ 35									$ 35
Stock Options
Share-based Compensation
Minimum percentage contribution made by employees of their salary to employee benefit plan		3.00%								3.00%
Maximum percentage contribution made by employees of their salary to employee benefit plan		15.00%								15.00%
Employer matching contribution, percent of match										20.00%
Profit sharing expenses										$ 11	17	18
Discontinued operations										$ 1	2	2
Vesting period										3 years
Intrinsic value of options exercised										$ 8	$ 20	$ 107
Closing stock price (in dollars per share)		$ 60.07								$ 60.07
Granted (in shares)										2,000,000	1,000,000	2,000,000
Weighted average exercise price of awards granted (in dollars per share)										$ 78.42	$ 95.06	$ 142.92
Restricted Stock Units
Share-based Compensation
Vesting period										3 years
Restricted stock, shares granted (in shares)										3,000,000	1,000,000	1,000,000
Restricted stock weighted average grant price (in dollars per share)										$ 61.34	$ 92.07	$ 138.76
Fair value of vested stock										$ 40	$ 261	$ 241
Performance Stock Units
Share-based Compensation
Granted (in shares)										1,000,000	2,000,000	1,000,000
Weighted average exercise price of awards granted (in dollars per share)										$ 65.43	$ 99.27	$ 130.04
Restricted stock, shares granted (in shares)										0
Restricted stock weighted average grant price (in dollars per share)										$ 65.43
Vested										$ 10	$ 35	$ 57

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