| Cover Page Document | Apr. 20, 2022 |
| Entity Information | |
| Entity Central Index Key | 0001136893 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Apr. 20, 2022 |
| Entity Tax Identification Number | 37-1490331 |
| Entity File Number | 1-16427 |
| Entity Incorporation, State or Country Code | GA |
| Entity Registrant Name | Fidelity National Information Services, Inc. |
| Entity Address, Street | 601 Riverside Avenue |
| Entity Address, City | Jacksonville |
| Entity Address, State | FL |
| Entity Address, Postal Zip Code | 32204 |
| City Area Code | 904 |
| Local Phone Number | 438-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| New York Stock Exchange | |
| Entity Information | |
| Title of each class | Common Stock, par value $0.01 per share |
| Trading Symbol | FIS |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 1.700% Senior Notes due 2022 | |
| Entity Information | |
| Title of each class | 1.700% Senior Notes due 2022 |
| Trading Symbol | FIS22B |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 0.125% Senior Notes due 2022 | |
| Entity Information | |
| Title of each class | 0.125% Senior Notes due 2022 |
| Trading Symbol | FIS22C |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 1.100% Senior Notes due 2024 | |
| Entity Information | |
| Title of each class | 1.100% Senior Notes due 2024 |
| Trading Symbol | FIS24A |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 0.750% Senior Notes due 2023 | |
| Entity Information | |
| Title of each class | 0.750% Senior Notes due 2023 |
| Trading Symbol | FIS23A |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 1.500% Senior Notes due 2027 | |
| Entity Information | |
| Title of each class | 1.500% Senior Notes due 2027 |
| Trading Symbol | FIS27 |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 1.000% Senior Notes due 2028 | |
| Entity Information | |
| Title of each class | 1.000% Senior Notes due 2028 |
| Trading Symbol | FIS28 |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 2.250% Senior Notes due 2029 | |
| Entity Information | |
| Title of each class | 2.250% Senior Notes due 2029 |
| Trading Symbol | FIS29 |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 2.000% Senior Notes due 2030 | |
| Entity Information | |
| Title of each class | 2.000% Senior Notes due 2030 |
| Trading Symbol | FIS30 |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 2.950% Senior Notes due 2039 | |
| Entity Information | |
| Title of each class | 2.950% Senior Notes due 2039 |
| Trading Symbol | FIS39 |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 0.625% Senior Notes due 2025 | |
| Entity Information | |
| Title of each class | 0.625% Senior Notes due 2025 |
| Trading Symbol | FIS25B |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 3.360% Senior Notes due 2031 | |
| Entity Information | |
| Title of each class | 3.360% Senior Notes due 2031 |
| Trading Symbol | FIS31 |
| Security Exchange Name | NYSE |
