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Note 23 - Employee Benefits - Weighted Principal Assumptions (Details) R$ in Millions | Dec. 31, 2017 BRL (R$) Rate | Dec. 31, 2016 BRL (R$) | Dec. 31, 2015 BRL (R$)
--- | --- | --- | ---
Actuarial assumption of medical cost trend rates [member] |  |  |
Statement Line Items [Line Items] |  |  |
Change in assumption, percentage (Rate) | Rate | 1.00% |  |
Increase in assumption | R$ (119.7) | R$ (104.7) | R$ (77.5)
Decrease in assumption | R$ 102.3 | 90.2 | 67.4
Actuarial assumption of discount rates [member] |  |  |
Statement Line Items [Line Items] |  |  |
Change in assumption, percentage (Rate) | Rate | 0.50% |  |
Increase in assumption | R$ 289.7 | 292.6 | 262.5
Decrease in assumption | R$ (309.2) | (311.5) | (280.1)
Actuarial assumption of expected rates of salary increases [member] |  |  |
Statement Line Items [Line Items] |  |  |
Change in assumption, percentage (Rate) | Rate | 0.50% |  |
Increase in assumption | R$ (12.9) | (16.6) | (13.3)
Decrease in assumption | 12.3 | 15.3 | 12.5
Actuarial assumption of life expectancy after retirement [member] |  |  |
Statement Line Items [Line Items] |  |  |
Increase in assumption | (180.6) | (175.9) | (135.1)
Decrease in assumption | R$ 176.5 | R$ 172.9 | R$ 131.1
Change in assumption, year | 1 |  |

X
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- Definition The reasonably possible percentage of the increase (decrease) in the actuarial assumption used to determine the present value of defined benefit obligation + References No definition available. + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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