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SHARE-BASED COMPENSATION PLAN - Long term compensation plans ("PS and SAR") (Details) | 12 Months Ended
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Dec. 31, 2019 EquityInstruments item R$ / shares | Dec. 31, 2018 EquityInstruments R$ / shares | Dec. 31, 2017 EquityInstruments
SHARE-BASED COMPENSATION PLAN |  |  |
Number of share-based compensation plans | item | 3 |  |
PSO |  |  |
Number of shares |  |  |
Beginning balance | 5,045,357 | 5,055,519 | 3,048,991
Granted during the year | 2,413,038 | 1,415,476 | 3,035,488
Exercised | (827,065) | (751,859) | (695,532)
Exercised due to resignation | (106,983) | (153,601) | (161,270)
Abandoned / prescribed due to resignation | (527,910) | (520,178) | (172,158)
Ending balance | 5,996,437 | 5,045,357 | 5,055,519
Weighted average exercise price for share options exercised | R$ / shares | R$ 31.75 | R$ 47.77 |
PSO | SAR and PLUS |  |  |
SHARE-BASED COMPENSATION PLAN |  |  |
Required investment, as a percentage of total phantom share options at grant date | 5.00% |  |
Required investment, as a percentage of total phantom share options three years after grant date | 20.00% |  |
PSO | SAR and PLUS | Minimum |  |  |
SHARE-BASED COMPENSATION PLAN |  |  |
Vesting period | 3 years |  |
PSO | SAR and PLUS | Maximum |  |  |
SHARE-BASED COMPENSATION PLAN |  |  |
Vesting period | 5 years |  |

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