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Risk Management (Details 1) - BRL (R$) R$ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Maximum Credit Risk Exposure Of The Financial Instruments [Abstract]
Cash and balances with banks		R$ 81,742,951	R$ 72,554,651
Derivative financial instruments		13,866,885	16,755,442
Loans and advances to banks		32,253,205	94,845,534
Loans and advances to customers		373,813,665	392,083,873
Other financial assets		599,199,362	497,974,002
Total items recorded in the balance sheet	[1]	1,100,876,068	1,074,213,502
Total items not recorded in the balance sheet (Note 41)		283,089,393	316,298,033
Total risk exposure		R$ 1,383,965,461	R$ 1,390,511,535
[1] Collaterals are mainly represented by: securities, properties, financial investments, sureties and guarantees.

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The amount of cash and bank balances held at central banks.

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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