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CHANGES IN EQUITY - Net Income Reserves (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
At January 1, 2022 R$ 84,017.6 R$ 75,151.2 R$ 62,556.0
Fiscal incentive reserve
Investments reserve
At December 31, 2022 83,327.8 84,017.6 75,151.2
Net income reserves, investment reserve [member]      
IfrsStatementLineItems [Line Items]      
At January 1, 2022 18,359.2 14,511.1 10,798.1
Fiscal incentive reserve (0.0) (0.0)
Investments reserve 3,696.7 3,848.1 3,713.0
At December 31, 2022 22,055.9 18,359.2 14,511.1
Net Income Reserves Legal Reserve [Member]      
IfrsStatementLineItems [Line Items]      
At January 1, 2022 4.5 4.5 4.5
Fiscal incentive reserve (0.0) (0.0) (0.0)
Investments reserve (0.0) (0.0) (0.0)
At December 31, 2022 4.5 4.5 4.5
Net income reserves, fiscal incentive [member]      
IfrsStatementLineItems [Line Items]      
At January 1, 2022 12,827.9 11,404.4 10,071.6
Fiscal incentive reserve 2,018.7 1,423.5 1,332.8
Investments reserve (0.0) (0.0)
At December 31, 2022 14,846.6 12,827.9 11,404.4
Net Income Reserve [Member]      
IfrsStatementLineItems [Line Items]      
At January 1, 2022 31,191.6 25,920.0 20,874.2
Fiscal incentive reserve 2,018.7 1,423.5 1,332.8
Investments reserve 3,696.7 3,848.1 3,713.0
At December 31, 2022 R$ 36,907.0 R$ 31,191.6 R$ 25,920.0