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SHAREHOLDERS' EQUITY - Other reserves (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | R$ 18,087,969 | R$ 12,025,934 | R$ 11,616,610
Gain (loss) on conversion of financial statements and on foreign investments | [1] | (2,857) | 45,819 | 137,546
Balances, end of the year |  | 7,337,378 | 18,087,969 | 12,025,934
Other reserves |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | 2,221,341 | 2,321,708 |
Actuarial loss |  | (22,037) | (95,628) |
Gain on conversion of financial asset and fair value |  | 4,151 | 2,360 |
Gain (loss) on conversion of financial statements and on foreign investments |  | (2,857) | 45,819 |
Realization of deemed cost, net of taxes |  |  | (52,918) |
Partial Realization of deemed cost, net of taxes |  | (70,654) |  |
Balances, end of the year |  | 2,129,944 | 2,221,341 | 2,321,708
Debenture conversion 5th issue |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | (45,746) | (45,746) |
Balances, end of the year |  | (45,746) | (45,746) | (45,746)
Actuarial loss |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | (194,118) | (98,490) |
Actuarial loss |  | (22,037) | (95,628) |
Balances, end of the year |  | (216,155) | (194,118) | (98,490)
Exchange variation and fair value of financial assets |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | 2,360 | 0 |
Gain on conversion of financial asset and fair value |  | 4,151 | 2,360 |
Balances, end of the year |  | 6,511 | 2,360 | 0
Exchange variation on conversion of financial statements of foreign subsidiaries |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | 209,987 | 164,168 |
Gain (loss) on conversion of financial statements and on foreign investments |  | (2,857) | 45,819 |
Balances, end of the year |  | 207,130 | 209,987 | 164,168
Deemed Cost |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balances, beginning of the year |  | 2,248,858 | 2,301,776 |
Realization of deemed cost, net of taxes |  |  | (52,918) |
Partial Realization of deemed cost, net of taxes |  | (70,654) |  |
Balances, end of the year |  | R$ 2,178,204 | R$ 2,248,858 | R$ 2,301,776
[1] | As of December 31, 2020 includes the exchange variation related to investments abroad of wholly-owned subsidiaries whose functional currencies are different from the Brazilian Real (notes 3.1.1 and 3.2.5). As of December 31, 2019 and 2018 includes the (i) exchange variation related to investments abroad of wholly-owned subsidiaries and (ii) hyperinflation referring to the wholly owned subsidiary Stenfar (note 3.2.6).

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