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Net gains/(losses) on financial instruments classified as held for trading (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net gains/(losses) on financial instruments classified as held for trading [Abstract]
Fixed income securities	R$ 9,862,617	R$ 4,654,959	R$ (5,174,739)
Derivative financial instruments	(1,426,160)	10,887,800	(4,267,748)
Equity securities	1,186,651	860,011	1,190,432
Total	R$ 9,623,108	R$ 16,402,770	R$ (8,252,055)

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- Definition

Net gains/(losses) on financial instruments classified as held for trading [Abstract].

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Net gains/(losses) on financial instruments classified as held for trading - Derivative financial instruments

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Net gains/(losses) on financial instruments classified as held for trading - Equities and investment funds

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No definition available.

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Net gains/(losses) on financial instruments classified as held for trading - Fixed income securities

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No definition available.

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- Definition

The gains (losses) on financial assets at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading; Gains (losses) on financial assets at fair value through profit or loss]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_i&doctype=Standard&book=B
-URIDate 2017-03-09

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