| Document and Entity Information | Feb. 22, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Kraft Heinz Co |
| Amendment Flag | false |
| Entity Central Index Key | 0001637459 |
| Document Type | 8-K |
| Document Period End Date | Feb. 22, 2021 |
| Entity File Number | 001-37482 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 46-2078182 |
| Entity Address, Address Line One | One PPG Place |
| Entity Address, City or Town | Pittsburgh |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 15222 |
| City Area Code | (412) |
| Local Phone Number | 456-5700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | KHC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
