Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Nov. 04, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-37403
Entity Registrant Name	Flutter Entertainment plc
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-1782229
Entity Address, Address Line One	290 Park Ave South 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
Title of 12(b) Security	Ordinary Shares, nominal value of €0.09 per share
Trading Symbol	FLUT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		178,035,332
Entity Central Index Key	0001635327
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3