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Income tax and social contribution (Details 6) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Before tax
Income tax and social contribution on adjustments recognized directly in equity
Financial assets recorded as available for sale	R$ 3,418,567	R$ 6,298,103	R$ (5,677,902)
Exchange differences on translations of foreign operations	23,010	(194,566)	118,485
Total	3,441,577	6,103,537	(5,559,417)
Tax (expense)/ benefit
Income tax and social contribution on adjustments recognized directly in equity
Financial assets recorded as available for sale	(1,231,202)	(2,587,076)	2,273,982
Exchange differences on translations of foreign operations	5,992	87,555	(57,788)
Total	(1,225,210)	(2,499,521)	2,216,194
Net of tax
Income tax and social contribution on adjustments recognized directly in equity
Financial assets recorded as available for sale	2,187,365	3,711,027	(3,403,920)
Exchange differences on translations of foreign operations	29,002	(107,011)	60,697
Total	R$ 2,216,367	R$ 3,604,016	R$ (3,343,223)

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- Definition

Income tax and social contribution on adjustments recognized directly in equity

+ References

No definition available.

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to exchange differences on the translation of financial statements of foreign operations. [Refer: Other comprehensive income; Reserve of exchange differences on translation]

+ References

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- Definition

The amount of income tax relating to an entity's share of other comprehensive income of associates and joint ventures accounted for using the equity method that will be reclassified to profit or loss. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

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