Business acquisition percentage of acquisition.

No definition available.

Name:	flut_BusinessAcquisitionPercentageOfAcquisition
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Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	flut_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Business combination percentage of discount on control.

+ References

No definition available.

+ Details

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Namespace Prefix:	flut_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Customer Relationships, Customer Churn, Period

+ References

No definition available.

+ Details

Name:	flut_CustomerRelationshipsCustomerChurnPeriod
Namespace Prefix:	flut_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Finite lived intangible assets measurement input.

+ References

No definition available.

+ Details

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Namespace Prefix:	flut_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Noncontrolling Interest, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	flut_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of discount on marketability.

+ References

No definition available.

+ Details

Name:	flut_PercentageOfDiscountOnMarketability
Namespace Prefix:	flut_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

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Period Type:	instant

- Definition

Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
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-Section 50
-Paragraph 2
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-Paragraph 2
-Subparagraph (h)(3)
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 1
-Subparagraph (b)(3)
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-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

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- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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-Paragraph 23
-Publisher FASB
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- Definition

The net amount, measured at acquisition-date fair value, of all the assets acquired and liabilities assumed that arise from contingencies and were recognized by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 1
-Subparagraph (d)(1)
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-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

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Period Type:	instant

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 7
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479637/805-30-30-7

+ Details

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-4A

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-Publisher FASB
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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
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-Paragraph 1F
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-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Subparagraph (SX 210.9-03(10)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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- Definition

Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Section 50
-Paragraph 1
-Subparagraph (g)
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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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BUSINESS COMBINATIONS AND DISPOSALS - Narrative (Details) € in Millions, $ in Millions									12 Months Ended
	May 31, 2024 USD ($)	Jan. 10, 2024 USD ($)	Jan. 10, 2024 EUR (€)	Dec. 31, 2022 USD ($)	Aug. 04, 2022 USD ($)	Aug. 04, 2022 EUR (€)	Jan. 10, 2022 USD ($)	Jan. 01, 2021	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 13,244					$ 13,352	$ 13,745	$ 13,244
Revenue											10,064	$ 9,482
Deferred tax liability									338	778
Business acquisition, transaction costs				12							12
MaxBet
Business Acquisition [Line Items]
Business acquisition percentage of acquisition		51.00%
Purchase consideration		$ 143	€ 131
Provisional fair value		127
Intangible assets, net		143
Goodwill		$ 126
Percentage of discount on marketability		15.00%
Business combination percentage of discount on control		9.00%
Business combination, pro forma information, revenue of acquiree since acquisition date, actual									207
Revenue									$ 15
MaxBet \| Redeemable Preferred Stock
Business Acquisition [Line Items]
Non-controlling interest		$ 110
MaxBet \| Trademarks
Business Acquisition [Line Items]
Finite lived intangible assets acquired		108
MaxBet \| Customer relationships
Business Acquisition [Line Items]
Finite lived intangible assets acquired		$ 22
BeyondPlay
Business Acquisition [Line Items]
Purchase consideration	$ 26
Goodwill	$ 9
Business acquisition percentage of voting interests acquired	100.00%
Net assets acquired	$ 17
Deferred tax liability	1
BeyondPlay \| Technology Intangibles Assets
Business Acquisition [Line Items]
Goodwill	$ 18
Sisal
Business Acquisition [Line Items]
Intangible assets, net				1,286	$ 1,286						1,286
Goodwill				1,228							1,228
Non-controlling interest				153							153
Revenue											465
Business acquisition percentage of voting interests acquired					100.00%
Cash payment				2,037	$ 2,037	€ 2,002
Deferred tax liability				$ 357	357						357
Business combination, acquisition related costs											7	3
Contractual amount					47
Loss allowance					$ 8
Property, plant and equipment additions										34
Goodwill increase (decrease)										$ (34)
Business acquisition, pro forma income (loss) from continuing operations, net of tax											28
Effective interest rate								5.29%
Sisal \| Discount Rate \| Level 3
Business Acquisition [Line Items]
Noncontrolling interest, measurement input									0.149
Sisal \| Measurement Input, Terminal Growth Rate \| Level 3
Business Acquisition [Line Items]
Noncontrolling interest, measurement input									0.050
Sisal \| Sisal Sans \| Sisal
Business Acquisition [Line Items]
Subsidiary, ownership percentage, noncontrolling owner					49.00%
Sisal \| Trademarks
Business Acquisition [Line Items]
Intangible assets, net					$ 529
Weighted average useful life					20 years	20 years
Sisal \| Trademarks \| Minimum \| Royalty Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					5.10%
Sisal \| Trademarks \| Minimum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					8.80%
Sisal \| Trademarks \| Maximum \| Royalty Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					7.60%
Sisal \| Trademarks \| Maximum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					14.90%
Sisal \| Customer relationships
Business Acquisition [Line Items]
Intangible assets, net					$ 278
Weighted average useful life					4 years 1 month 6 days	4 years 1 month 6 days
Customer relationships, customer churn, period					5 years	5 years
Sisal \| Customer relationships \| Minimum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					11.00%
Sisal \| Customer relationships \| Minimum \| Measurement Input, Contributory Assets Charge
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					13.90%
Sisal \| Customer relationships \| Maximum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					14.90%
Sisal \| Customer relationships \| Maximum \| Measurement Input, Contributory Assets Charge
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					12.50%
Sisal \| Licenses
Business Acquisition [Line Items]
Intangible assets, net					$ 223
Sisal \| Developed Technology Rights
Business Acquisition [Line Items]
Intangible assets, net					$ 130
Weighted average useful life					5 years	5 years
Sisal \| Developed Technology Rights \| Royalty Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					10.10%
Sisal \| Developed Technology Rights \| Minimum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					11.00%
Sisal \| Developed Technology Rights \| Maximum \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					14.90%
Sisal \| Point of Sales and Affiliate Network
Business Acquisition [Line Items]
Intangible assets, net					$ 126
Sisal \| Point of Sales and Affiliate Network \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					8.80%
Sisal \| Point of Sales and Affiliate Network \| Measurement Input, Attrition Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input					10.00%
Sisal \| Point of Sales and Affiliate Network \| Minimum
Business Acquisition [Line Items]
Weighted average useful life					15 years	15 years
Sisal \| Point of Sales and Affiliate Network \| Maximum
Business Acquisition [Line Items]
Weighted average useful life					20 years	20 years
Tombola
Business Acquisition [Line Items]
Purchase consideration							$ 557
Intangible assets, net							333
Goodwill							$ 295
Business combination, pro forma information, revenue of acquiree since acquisition date, actual											217
Business acquisition percentage of voting interests acquired							100.00%
Cash payment							$ 557
Deferred tax liability							83
Business combination, acquisition related costs											4	$ 3
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual											12
Tombola \| Trademarks
Business Acquisition [Line Items]
Intangible assets, net							$ 122
Weighted average useful life							20 years
Tombola \| Trademarks \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input							11.10%
Tombola \| Customer relationships
Business Acquisition [Line Items]
Intangible assets, net							$ 163
Weighted average useful life							5 years 1 month 6 days
Tombola \| Customer relationships \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input							10.90%
Tombola \| Developed Technology Rights
Business Acquisition [Line Items]
Intangible assets, net							$ 48
Weighted average useful life							5 years
Tombola \| Developed Technology Rights \| Discount Rate
Business Acquisition [Line Items]
Finite lived intangible assets measurement input							10.10%
Sachiko
Business Acquisition [Line Items]
Purchase consideration											$ 7
Business acquisition percentage of voting interests acquired				100.00%							100.00%
Sachiko \| Junglee Games
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable, percentage				5.00%							5.00%