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Impairment of loans and advances (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment of loans and advances [Abstract]
Impairment losses	R$ (25,780,383)	R$ (22,357,042)	R$ (19,527,976)
Recovery of credits charged-off as losses	7,034,857	5,507,507	4,144,879
Reversal of impairment	1,884,691	1,499,257	661,945
Total	R$ (16,860,835)	R$ (15,350,278)	R$ (14,721,152)

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- Definition

Impairment of loans and advances [Abstract].

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No definition available.

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- Definition

Impairment of loans and advances (Note 12).

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- Definition

Impairment of loans and advances - Recovery of credits charged-off as loss

+ References

No definition available.

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- Definition

The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 130
-Subparagraph b
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-Subparagraph d
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard
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- Definition

The amount recognised as an increase of the carrying amount of an asset or cash-generating unit to its recoverable amount when an impairment loss had been previously recognised. [Refer: Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard
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