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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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