| Cover | Mar. 15, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 15, 2021 |
| Entity Registrant Name | RESTAURANT BRANDS INTERNATIONAL INC. |
| Entity Central Index Key | 0001618756 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | Z4 |
| Entity File Number | 001-36786 |
| Entity Tax Identification Number | 98-1202754 |
| Entity Address, Address Line One | 130 King Street West, Suite 300 |
| Entity Address, City or Town | Toronto, |
| Entity Address, State or Province | ON |
| Entity Address, Postal Zip Code | M5X 1E1 |
| City Area Code | 905 |
| Local Phone Number | 339-6011 |
| Title of 12(b) Security | Common Shares, without par value |
| Trading Symbol | QSR |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Restaurant Brands International Limited Partnership | |
| Entity Information [Line Items] | |
| Entity Registrant Name | RESTAURANT BRANDS INTERNATIONAL LIMITED PARTNERSHIP |
| Entity Central Index Key | 0001618755 |
| Entity Incorporation, State or Country Code | A6 |
| Entity File Number | 001-36787 |
| Entity Tax Identification Number | 98-1206431 |
