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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013
Share-based Compensation |  |  |  |  |  |  |
Employer matching contribution, percent of match (percent) |  |  |  | 50.00% |  |  |
Profit sharing expenses |  |  |  | $ 107 | $ 91 | $ 82 |
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) |  |  |  | $ 21.17 | $ 19.25 | $ 16.07 |
Total unrecognized compensation cost related to non-vested stock awards |  |  |  | $ 304 | $ 343 |  |
Weighted average period over which compensation cost is expected to be recognized (in years) |  |  |  | 1 year 2 months 12 days | 1 year 10 months 24 days |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Compensation expense |  |  |  | $ 283 | $ 402 | $ 84 |
FIS Plan amended and restated |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Shares available for grant, ending (in shares) |  |  |  | 32,000,000 |  |  |
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 |  |  |  | $ 20 | 15 | 14 |
Number of additional shares authorized (in shares) |  | 10,000,000 |  |  |  |  |
Vesting period (years) |  |  |  | 3 years |  |  |
Intrinsic value of options exercised |  |  |  | $ 348 | $ 189 | $ 257 |
Closing stock price (in dollars per share) |  |  |  | $ 141.46 |  |  |
Granted (in shares) |  |  |  | 2,000,000 | 1,000,000 | 1,000,000 |
Granted (weighted average exercise price) |  |  |  | $ 120.47 | $ 113.48 | $ 96.49 |
Risk free interest rate (percent) |  |  |  | 0.40% | 2.20% | 2.50% |
Volatility (percent) |  |  |  | 24.70% | 20.10% | 19.20% |
Dividend yield (percent) |  |  |  | 1.20% | 1.20% | 1.30% |
Weighted average expected life (years) |  |  |  | 4 years 1 month 6 days | 4 years 1 month 6 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) |  |  |  | 1,000,000 | 2,000,000 | 1,000,000 |
Restricted stock weighted average grant price (in dollars per share) |  |  |  | $ 127,140,000 |  |  |
Fair value of vested stock |  |  |  | $ 293 | $ 169 | $ 97 |
Restricted Stock | Minimum |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Restricted stock weighted average grant price (in dollars per share) |  |  |  | $ 127.14 | $ 124.72 | $ 96.50 |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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