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Note 23 - Employee Benefits - Plan Assets (Details) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Line Items [Line Items]
Balance	R$ 2,104.2	R$ 2,213.3
Administrative costs	3.4	3.7	R$ 3.4
Expected Return excluding interest income	208.5	544.5	86.3
Balance	2,252.3	2,104.2	2,213.3
Plan assets [member]
Statement Line Items [Line Items]
Balance	3,845.2	3,781.4	3,550.1
Interest Income	273.3	274.7	259.5
Administrative costs	(3.4)	(3.7)	(3.4)
Expected Return excluding interest income	(64.8)	269.8	(173.2)
Acquisition through business combination		73.5
Contributions by employer	183.2	175.9	107.6
Contributions by plan participants	4.5	5.6	5.2
Exchange differences	166.8	(315.3)	428.5
Benefits paid excluding costs of administration	(398.6)	(416.7)	(392.9)
Balance	R$ 4,006.2	R$ 3,845.2	R$ 3,781.4

X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from administrative costs.

+ References

No definition available.

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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]]

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