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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Risk Rating (Details) - Credit risk - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Cash and cash equivalents and marketable securities |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | R$ 9,231,914 | R$ 9,579,461
Cash and cash equivalents and marketable securities | AAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating |  | 190,360
Cash and cash equivalents and marketable securities | AA- |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating |  | 56,388
Cash and cash equivalents and marketable securities | A+ |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating |  | 606,757
Cash and cash equivalents and marketable securities | A |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating |  | 188,458
Cash and cash equivalents and marketable securities | A- |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating |  | 211,238
Cash and cash equivalents and marketable securities | brAAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 7,704,501 | 7,153,079
Cash and cash equivalents and marketable securities | brAA+ |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 163,955 | 745,177
Cash and cash equivalents and marketable securities | brAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 836,546 | 372,188
Cash and cash equivalents and marketable securities | brAA- |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 278,712 | 23,050
Cash and cash equivalents and marketable securities | brA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 240,382 | 17,847
Cash and cash equivalents and marketable securities | Others |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 7,818 | 14,919
Derivative financial instruments |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 986,526 | 830,426
Derivative financial instruments | AAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 17,412 |
Derivative financial instruments | AA- |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 417,510 |
Derivative financial instruments | A+ |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 1,617 | 27,363
Derivative financial instruments | A |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 73,135 | 165,851
Derivative financial instruments | A- |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 130,546 | 222,761
Derivative financial instruments | brAAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 305,311 | 404,693
Derivative financial instruments | brAA+ |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | 32 | R$ 9,758
Derivative financial instruments | brAA |  |
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT |  |
Credit risk exposure, external rating | R$ 40,963 |

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- Definition The amount of credit exposure that has been rated by external rating agencies. [Refer: Credit exposure] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph IG24 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG24_c&doctype=Implementation%20Guidance&book=b -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_c&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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