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Other operating income/(expenses) (Details Text) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Operating Incomeexpenses Details Text [Abstract]
Effect of the (additions)/reversal of provision for tax contingency	R$ 487,269	R$ (484,227)	R$ (570,835)
Impairment losses in the amount	185,188	31,256	207,880
Operating expense related of insurance operation	R$ 1,354,719	R$ 1,388,645	R$ 1,281,381

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- Definition

Other operating income/(expenses) (Details Text)

+ References

No definition available.

+ Details

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- Definition

The amount of acquisition and administration expense relating to insurance contracts. [Refer: Types of insurance contracts [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
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-URIDate 2017-03-09

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- Definition

Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss; Depreciation and amortisation expense; Impairment loss (reversal of impairment loss) recognised in profit or loss; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20
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- Definition

The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to impairment of goodwill. [Refer: Accounting profit; Goodwill]

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