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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

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