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Insurance technical provisions and pension plans (Details 9) - BRL (R$) R$ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Changes in reinsurance assets [abstract]
At the beginning of the year		R$ 1,186,194	R$ 1,144,506
Additions		186,867	667,908
Reversals		(139,641)	(485,724)
Recovered insurance losses		(259,433)	(173,908)
Adjustment for inflation and interest		(411)	43,790
Others	[1]	(754,362)	(10,378)
At the end of the year		R$ 219,214	R$ 1,186,194
[1] Includes the transfer of part of the operation of the large risk portfolio (Note 43).

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- Definition

Changes in reinsurance assets - Adjustment of inflation and interest

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No definition available.

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Changes in reinsurance assets - Recovered insurance losses

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- Definition

Changes in reinsurance assets - Reversals

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- Definition

The amount of additions to reinsurance assets, other than those acquired through business combinations. [Refer: Business combinations [member]; Reinsurance assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 4
-IssueDate 2017-01-01
-Paragraph 37
-Subparagraph e
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-URIDate 2017-03-09

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- Definition

The increase (decrease) in reinsurance assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Reinsurance assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 4
-IssueDate 2017-01-01
-Paragraph 37
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_37_e&doctype=Standard
-URIDate 2017-03-09

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- Definition

The amount of a cedant’s net contractual rights under a reinsurance contract.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
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