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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Contractual maturities of financial liabilities (Details) - Liquidity risk - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value R$ 89,532,052 R$ 74,082,444
Financial liabilities, Future Value 125,355,955 108,690,925
Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 9,492,973 13,485,638
Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 8,933,200 7,756,823
Later than two years and not later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 43,336,181 31,848,867
Later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 63,593,601 55,599,597
Trade accounts payable    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 2,361,098 2,376,459
Financial liabilities, Future Value 2,361,098 2,376,459
Trade accounts payable | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 2,361,098 2,376,459
Loans, financing and debentures    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 72,899,882 63,684,326
Financial liabilities, Future Value 101,540,320 89,708,210
Loans, financing and debentures | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 4,034,595 8,501,278
Loans, financing and debentures | Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 6,619,518 5,692,149
Loans, financing and debentures | Later than two years and not later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 36,751,023 29,088,292
Loans, financing and debentures | Later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 54,135,184 46,426,491
Lease liabilities    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 5,191,760 3,984,070
Financial liabilities, Future Value 9,552,075 7,109,966
Lease liabilities | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 620,177 559,525
Lease liabilities | Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 806,560 1,426,011
Lease liabilities | Later than two years and not later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 2,198,419 1,186,386
Lease liabilities | Later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 5,926,919 3,938,044
Liabilities for asset acquisition and subsidiaries    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 502,228 541,615
Financial liabilities, Future Value 573,920 618,910
Liabilities for asset acquisition and subsidiaries | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 116,376 103,132
Liabilities for asset acquisition and subsidiaries | Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 112,155 101,149
Liabilities for asset acquisition and subsidiaries | Later than two years and not later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 253,419 315,989
Liabilities for asset acquisition and subsidiaries | Later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 91,970 98,640
Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 8,117,400 2,917,913
Financial liabilities, Future Value 10,868,858 8,299,319
Derivative financial instruments | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 1,999,811 1,488,906
Derivative financial instruments | Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 1,296,199 415,791
Derivative financial instruments | Later than two years and not later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 4,133,320 1,258,200
Derivative financial instruments | Later than five years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 3,439,528 5,136,422
Other liabilities    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Liabilities, Book Value 459,684 578,061
Financial liabilities, Future Value 459,684 578,061
Other liabilities | Not later than one year    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value 360,916 456,338
Other liabilities | Later than one year and not later than two years    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial liabilities, Future Value R$ 98,768 R$ 121,723