| Document and Entity Information | May 07, 2024 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001136893 |
| Document Type | 8-K |
| Document Period End Date | May 07, 2024 |
| Entity Registrant Name | Fidelity National Information Services, Inc. |
| Entity File Number | 1-16427 |
| Entity Incorporation State Country Code | GA |
| Entity Tax Identification Number | 37-1490331 |
| Entity Address, Address Line One | 347 Riverside Avenue |
| Entity Address, City or Town | Jacksonville |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 32202 |
| 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 |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | FIS |
| Security Exchange Name | NYSE |
| M 1.100 Senior Notes Due 2024 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.100% Senior Notes due 2024 |
| Trading Symbol | FIS24A |
| Security Exchange Name | NYSE |
| M 0.625 Senior Notes Due 2025 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 0.625% Senior Notes due 2025 |
| Trading Symbol | FIS25B |
| Security Exchange Name | NYSE |
| M 1.500 Senior Notes Due 2027 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.500% Senior Notes due 2027 |
| Trading Symbol | FIS27 |
| Security Exchange Name | NYSE |
| M 1.000 Senior Notes Due 2028 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.000% Senior Notes due 2028 |
| Trading Symbol | FIS28 |
| Security Exchange Name | NYSE |
| M 2.250 Senior Notes Due 2029 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.250% Senior Notes due 2029 |
| Trading Symbol | FIS29 |
| Security Exchange Name | NYSE |
| M 2.000 Senior Notes Due 2030 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.000% Senior Notes due 2030 |
| Trading Symbol | FIS30 |
| Security Exchange Name | NYSE |
| M 3.360 Senior Notes Due 2031 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.360% Senior Notes due 2031 |
| Trading Symbol | FIS31 |
| Security Exchange Name | NYSE |
| M 2.950 Senior Notes Due 2039 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.950% Senior Notes due 2039 |
| Trading Symbol | FIS39 |
| Security Exchange Name | NYSE |
