CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 14,048	$ 11,790	$ 9,463
Cost of Sales	(7,346)	(6,202)	(4,813)
Gross profit	6,702	5,588	4,650
Technology, research and development expenses	(820)	(765)	(552)
Sales and marketing expenses	(3,205)	(3,776)	(3,014)
General and administrative expenses	(1,808)	(1,596)	(1,172)
Operating profit (loss)	869	(549)	(88)
Other (expense) income, net	(434)	(157)	5
Interest expense, net	(419)	(385)	(212)
Income (loss) before income taxes	16	(1,091)	(295)
Income tax benefit (expense)	146	(120)	(75)
Net income (loss)	162	(1,211)	(370)
Net gain (loss) attributable to non-controlling interests and redeemable non-controlling interests	53	13	(1)
Adjustment of redeemable non-controlling interest to redemption value	66	(2)	63
Net loss attributable to Flutter shareholder - basic	$ 43	$ (1,222)	$ (432)
Earnings (loss) per share
Basic (in USD per share)	$ 0.24	$ (6.89)	$ (2.44)
Diluted (in USD per share)	$ 0.24	$ (6.89)	$ (2.44)
Other comprehensive (loss) income, after tax:
Effective portion of changes in fair value of cash flow hedges	$ (12)	$ (121)	$ 80
Fair value of cash flow hedges transferred to the income statement	32	93	(72)
Changes in excluded components of fair value hedge	(1)	0	0
Foreign exchange gain on net investment hedges	73	30	(145)
Foreign exchange (loss) gain on translation of the net assets of foreign currency denominated entities	(554)	357	(896)
Fair value movements on available for sale debt instruments	0	5	(4)
Other comprehensive (loss) income	(462)	364	(1,037)
Other comprehensive (loss) income attributable to Flutter shareholders	(444)	299	(926)
Other comprehensive (loss) income attributable to non-controlling interest and redeemable non-controlling interest	(18)	65	(111)
Total comprehensive loss for the year	$ (300)	$ (847)	$ (1,407)