v3.25.3

Carrols Acquisition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		2 Months Ended	3 Months Ended	12 Months Ended
	May 16, 2024	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2025	May 15, 2024
Asset Acquisition, Contingent Consideration [Line Items]
Goodwill				$ 5,986	$ 6,221
RH
Asset Acquisition, Contingent Consideration [Line Items]
Goodwill				491	371
BK
Asset Acquisition, Contingent Consideration [Line Items]
Goodwill				240	$ 358
Carrols Restaurant Group, Inc.
Asset Acquisition, Contingent Consideration [Line Items]
Ownership percentage						15.00%
Acquisition, remaining issued and outstanding shares percentage	85.00%
Business acquisition price per share (in dollars per share)	$ 9.55
Business combination, recognition of gain	$ 79
Total cash paid	543
Outstanding debt	431
Payment to acquire business, liabilities incurred		$ 750
Fees and expenses related to acquisition				$ 11
Good, period decrease			$ 2
Adjustment of property, plant and equipment values			$ 2
Weighted average amortization period			12 years
Goodwill	$ 479
Carrols Restaurant Group, Inc. \| RH
Asset Acquisition, Contingent Consideration [Line Items]
Goodwill			$ 362
Carrols Restaurant Group, Inc. \| BK
Asset Acquisition, Contingent Consideration [Line Items]
Goodwill			$ 117

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Restaurant Brands International Limited Partnership 10-Q