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Note 23 - Employee Benefits - Net Liability for Defined Benefit Plans (Details) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Line Items [Line Items]
Present value of funded obligations	R$ (5,161.0)	R$ (5,027.7)	R$ (4,592.1)
Fair value of plan assets	4,059.6	4,006.2	3,845.2
Present value of net funded obligations	(1,101.4)	(1,021.5)	(746.9)
Present value of unfunded obligations	(790.9)	(757.4)	(741.3)
Present value of net obligations, net	(1,892.3)	(1,778.9)	(1,488.2)
Asset ceiling	(298.3)	(368.4)	(532.2)
Net liability	(2,190.6)	(2,147.3)	(2,020.4)
Other long term employee benefits	(88.7)	(105.0)	(83.8)
Total employee benefits	(2,279.3)	(2,252.3)	(2,104.2)
Employee benefits assets [member]
Statement Line Items [Line Items]
Total employee benefits	64.3	58.4	33.5
Employee benefit liabilities [member]
Statement Line Items [Line Items]
Total employee benefits	R$ (2,343.6)	R$ (2,310.7)	R$ (2,137.7)

X

- Definition

The present value of benefits available from refunds in the defined benefit plan or reductions in future contributions to the defined benefit plan.

+ References

No definition available.

+ Details

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X

- Definition

The present value of the funded portion, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods.

+ References

No definition available.

+ Details

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X

- Definition

The present value unfunded portion, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods.

+ References

No definition available.

+ Details

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X

- Definition

The other long term employee benefit liabilities of the entity.

+ References

No definition available.

+ Details

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X

- References

No definition available.

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X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
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X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 140
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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
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X

- Definition

The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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