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Note 23 - Employee Benefits - Defined Benefit Obligation (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
Service cost	(38.2)	(43.1)	R$ (42.4)
Gains and (losses) on settlements or reductions in benefits	(4.2)	(0.7)	(1.1)
Balance	2,252.3	2,104.2	2,213.3
Present value of defined benefit obligation [member]
Statement Line Items [Line Items]
Balance	(5,333.4)	(5,403.0)	(4,808.0)
Acquisitions through exchange transaction of shareholdings		(67.3)
Service cost	(38.2)	(43.1)	(42.4)
Interest cost	(321.5)	(320.5)	(308.2)
Gains and (losses) on settlements or reductions in benefits	3.9	2.2	1.1
Contributions by plan participants	(4.1)	(5.2)	(5.2)
Actuarial gains and (losses) - geographical assumptions	77.3	(20.1)
Actuarial gains and (losses) - financial assumptions	(140.3)	(321.1)	182.5
Experience adjustment	(115.7)	(182.8)	(10.6)
Reclassifications	(7.5)	11.1
Exchange differences	(306.5)	599.6	(805.1)
Benefits paid	400.9	416.8	392.9
Balance	R$ (5,785.1)	R$ (5,333.4)	R$ (5,403.0)

X

- Definition

he increase (decrease) in the net defined benefit liability (asset) resulting from acquisitions through stock exchange.

+ References

No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes due to reclassification.

+ References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

+ 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 employee service in the current period. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]]

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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)]

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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)]

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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]]

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

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