| Document and Entity Information | Nov. 28, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001635327 |
| Document Type | 8-K |
| Document Period End Date | Nov. 28, 2024 |
| Entity Registrant Name | Flutter Entertainment plc |
| Entity Incorporation State Country Code | L2 |
| Entity File Number | 001-37403 |
| Entity Tax Identification Number | 98-1782229 |
| Entity Address, Address Line One | 290 Park Ave South |
| Entity Address, Address Line Two | 14th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10010 |
| City Area Code | (646) |
| Local Phone Number | 930-0950 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Ordinary Shares, nominal value of €0.09 per share |
| Trading Symbol | FLUT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
