CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY AND REDEEMABLE NON-CONTROLLING INTERESTS - USD ($) $ in Millions	Total	Total Flutter Shareholders’ Equity	Redeemable non- controlling interests	Ordinary Share	Shares held by employee benefit	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss)	Retained Earnings	Non- controlling Interests
Beginning balance at Dec. 31, 2021			$ 1,327
Increase (Decrease) in Temporary Equity [Roll Forward]
Net (loss)			59
Adjustment of redeemable non-controlling interest redeemable at fair value			(93)
Business combinations			5
Dividend paid to non-controlling interests			(7)
Acquisition of redeemable non-controlling interests			(251)
Other Comprehensive (Loss)	$ (1,037)		(111)
Ending balance at Dec. 31, 2022			929
Beginning balance (in shares) at Dec. 31, 2021				175,628,334	33,158
Beginning balance at Dec. 31, 2021	12,162	$ 12,162		$ 36	$ (7)	$ 1,051	$ (856)	$ 11,938	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(429)	(432)						(432)	3
Adjustment of redeemable non-controlling interest redeemable at fair value	$ 93	93						93
Exercised/Vested (in shares)	87,306			463,568
Shares issued on exercise of employee share options	$ 9	9				9
Business combinations	153								153
Ordinary shares of the Company acquired by the Employee Benefit Trust (in shares)					23,775
Ordinary shares of the Company acquired by the Employee Benefit Trust	(3)	(3)			$ (3)
Equity-settled transactions - expense recorded in the income statement	132	132				132
Equity-settled transactions - vesting (in shares)					(55,537)
Equity-settled transactions - vesting	0				$ 9			(9)
Dividend paid to non-controlling interests			(7)
Other Comprehensive (Loss)	(926)	(926)					(926)
Ending balance (in shares) at Dec. 31, 2022				176,091,902	1,396
Ending balance at Dec. 31, 2022	11,191	11,035		$ 36	$ (1)	1,192	(1,782)	11,590	156
Increase (Decrease) in Temporary Equity [Roll Forward]
Net (loss)			3
Adjustment of redeemable non-controlling interest redeemable at fair value			258
Acquisition of redeemable non-controlling interests			(95)
Other Comprehensive (Loss)	364		57
Ending balance at Dec. 31, 2023			1,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(1,214)	(1,222)						(1,222)	8
Adjustment of redeemable non-controlling interest redeemable at fair value	$ (258)	(258)						(258)
Exercised/Vested (in shares)	249,588			916,747
Shares issued on exercise of employee share options	$ 13	13				13
Ordinary shares of the Company acquired by the Employee Benefit Trust (in shares)					1,106,417
Ordinary shares of the Company acquired by the Employee Benefit Trust	(212)	(212)			$ (212)
Equity-settled transactions - expense recorded in the income statement	180	180				180
Equity-settled transactions - vesting (in shares)					(1,107,813)
Equity-settled transactions - vesting	209	209			$ 213			(4)
Other Comprehensive (Loss)	307	299					299		8
Ending balance (in shares) at Dec. 31, 2023				177,008,649	0
Ending balance at Dec. 31, 2023	10,216	10,044		$ 36	$ 0	1,385	(1,483)	10,106	172
Increase (Decrease) in Temporary Equity [Roll Forward]
Net (loss)			102
Adjustment of redeemable non-controlling interest redeemable at fair value			455
Business combinations			110
Dividend paid to non-controlling interests	(16)
Other Comprehensive (Loss)	(462)		(11)
Ending balance at Dec. 31, 2024			$ 1,808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60	43						43	17
Adjustment of redeemable non-controlling interest redeemable at fair value	$ (455)	(455)						(455)
Exercised/Vested (in shares)	421,123			1,331,464
Shares issued on exercise of employee share options	$ 30	30				30
Equity-settled transactions - expense recorded in the income statement	$ 196	196				196
Repurchase of shares (in shares)	(444,746)
Repurchase of shares	$ (121)
Dividend paid to non-controlling interests	(16)
Other Comprehensive (Loss)	(451)	(444)					(444)		(7)
Ending balance (in shares) at Dec. 31, 2024				177,895,367	0
Ending balance at Dec. 31, 2024	$ 9,459	$ 9,293		$ 36	$ 0	$ 1,611	$ (1,927)	$ 9,573	$ 166