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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

- Definition

The amount of reasonably possible increase in actuarial assumption.

+ References

No definition available.

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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.

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- References

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X

- 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
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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

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