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SHAREHOLDERS' EQUITY - Other reserves (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other comprehensive income |  |  |
Balances, beginning of year | R$ 12,025,935 | R$ 11,616,611 | R$ 10,124,989
Gain (loss) on conversion of financial statements and on foreign investments | 45,819 | 137,546 | 38,006
Balances, end of year | 18,087,969 | 12,025,935 | 11,616,611
Other reserves |  |  |
Other comprehensive income |  |  |
Balances, beginning of year | 2,321,708 | 2,298,328 |
Actuarial gain (loss) | (95,283) | (45,741) |
Gain (loss) on conversion of financial statements and on foreign investments | 47,834 | 137,546 |
Realization of deemed cost, net of taxes | (52,918) | (68,424) |
Balances, end of year | 2,221,342 | 2,321,708 | 2,298,328
Debenture conversion 5th issue |  |  |
Other comprehensive income |  |  |
Balances, beginning of year | (45,745) | (45,745) |
Actuarial gain (loss) | 0 | 0 |
Gain (loss) on conversion of financial statements and on foreign investments | 0 | 0 |
Realization of deemed cost, net of taxes | 0 | 0 |
Balances, end of year | (45,745) | (45,745) | (45,745)
Actuarial gain (loss) |  |  |
Other comprehensive income |  |  |
Balances, beginning of year | (98,490) | (52,749) |
Actuarial gain (loss) | (95,283) | (45,741) |
Gain (loss) on conversion of financial statements and on foreign investments | 0 | 0 |
Realization of deemed cost, net of taxes | 0 | 0 |
Balances, end of year | (193,773) | (98,490) | (52,749)
Exchange variation on conversion of financial statements of foreign subsidiaries |  |  |
Other comprehensive income |  |  |
Balances, beginning of year | 164,168 | 26,622 |
Actuarial gain (loss) | 0 | 0 |
Gain (loss) on conversion of financial statements and on foreign investments | 47,834 | 137,546 |
Realization of deemed cost, net of taxes | 0 | 0 |
Balances, end of year | 212,002 | 164,168 | 26,622
Deemed Cost |  |  |
Other comprehensive income |  |  |
Balances, beginning of year | 2,301,776 | 2,370,200 |
Actuarial gain (loss) | 0 | 0 |
Gain (loss) on conversion of financial statements and on foreign investments | 0 | 0 |
Realization of deemed cost, net of taxes | (52,918) | (68,424) |
Balances, end of year | R$ 2,248,858 | R$ 2,301,776 | R$ 2,370,200

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