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Share-Based Compensation Plans - Phantom Stock Options (Details) | 12 Months Ended
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Dec. 31, 2018 BRL (R$) EquityInstruments item | Dec. 31, 2017 BRL (R$) EquityInstruments | Dec. 31, 2016 EquityInstruments
Share-Based Compensation Plans |  |  |
Number of share-based compensation plans | item | 4 |  |
PSO |  |  |
Number of shares |  |  |
Available at the beginning of the year | 5,055,519 | 3,048,991 | 3,570,103
Granted during the year | 1,415,476 | 3,035,488 | 1,092,921
Intercompany transfer |  |  | 32,061
Exercised | (751,859) | (695,532) | (1,144,900)
Exercised due to dismissal | (153,601) | (161,270) | (138,896)
Abandoned / prescribed due to dismissal | (520,178) | (172,158) | (362,298)
Available at the end of the year | 5,045,357 | 5,055,519 | 3,048,991
Weighted average exercise price for share options exercised | R$ | R$ 47.77 |  |
Weighted average exercise price for share options exercised due to dismissal | R$ |  | R$ 19.84 |
PSO | SAR 2017 and PLUS 2017 |  |  |
Share-Based Compensation Plans |  |  |
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 2017 and PLUS 2017 | Minimum |  |  |
Share-Based Compensation Plans |  |  |
Vesting period |  | 3 years |
PSO | SAR 2017 and PLUS 2017 | Maximum |  |  |
Share-Based Compensation Plans |  |  |
Vesting period |  | 5 years |

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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