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Loss Per Share - Schedule of Basic And Diluted Net Loss Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss $ (177) $ (111)
Net loss attributable to Flutter shareholders – basic $ (196) $ (102)
Net loss per share attributable to Flutter shareholders – basic $ (1.1) $ (0.58)
Net loss per share attributable to Flutter shareholders – diluted $ (1.1) $ (0.58)
Flutter Entertainment Plc [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss $ (177) $ (111)
Net gain/(loss) attributable to non-controlling interests and redeemable non-controlling interests 4 (9)
Adjustment of redeemable non-controlling interest to redemption value 15 0
Net loss attributable to Flutter shareholders – basic (196) (102)
Net loss attributable to Flutter shareholders – diluted $ (196) $ (102)
Weighted average shares – basic 178 177
Weighted average shares – diluted 178 177
Net loss per share attributable to Flutter shareholders – basic $ (1.1) $ (0.58)
Net loss per share attributable to Flutter shareholders – diluted $ (1.1) $ (0.58)