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21. EQUITY (Details 4) - shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EquityAbstractLineItems [Line Items] |  |  |
Shares at the beginning of the period | 811,759,800 | 811,416,022 | 811,139,545
Purchase of treasury shares | (4,836,000) |  |
Delivery of restricted shares | 783,362 | 343,778 | 276,477
Shares at the end of the period | 807,707,162 | 811,759,800 | 811,416,022
Treasury shares [member] |  |  |
EquityAbstractLineItems [Line Items] |  |  |
Shares at the beginning of the period | 713,446 | 1,057,224 | 1,333,701
Purchase of treasury shares | 4,836,000 |  |
Delivery of restricted shares | (783,362) | (343,778) | (276,477)
Shares at the end of the period | 4,766,084 | 713,446 | 1,057,224

X
- Definition The number of shares delivery of restricted shares. + References No definition available. + Details
Name: | brf_AnticipatedTransferOfRestrictedShares
Namespace Prefix: | brf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | brf_EquityAbstractLineItems
Namespace Prefix: | brf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in equity resulting from the purchase or issue of treasury shares. + References No definition available. + Details
Name: | brf_SaleOfTreasuryShares
Namespace Prefix: | brf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References No definition available. + Details
Name: | brf_TreasuryStockShares1
Namespace Prefix: | brf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_TreasurySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |