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Risk Management (Details 25) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets and liabilities measured at fair value      
Brazilian government securities R$ 202,249,272 R$ 161,103,399  
Corporate debt and marketable equity securities 12,339,790 10,383,682  
Bank debt securities 8,348,269 18,600,127  
Mutual funds 4,377,508 4,303,781  
Foreign governments securities 528,010 635,390  
Brazilian sovereign bonds 307 1,358,025  
Trading securities 227,843,156 196,384,404  
Derivative financial instruments 13,866,885 16,755,442  
Derivative financial instruments (liabilities) (14,274,999) (13,435,678)  
Derivatives (408,114) 3,319,764  
Brazilian government securities 103,281,758 59,198,028  
Corporate debt securities 39,978,630 42,142,708  
Bank debt securities 1,183,853 1,559,043  
Brazilian sovereign bonds 728,127 401,214  
Foreign governments securities 3,202,547    
Marketable equity securities and other stocks 11,037,807 9,817,561  
Balance on 159,412,722 113,118,554  
Brazilian government securities 53,841,066 61,812,995  
Corporate debt securities 825,287 3,899,878  
Bank debt securities 4,904,070 4,742,273  
Brazilian sovereign bonds 713,555 102,841  
Financial assets pledged as collateral 60,283,978 70,557,987  
Total 447,131,742 383,380,709  
Level 1      
Financial assets and liabilities measured at fair value      
Brazilian government securities 198,273,452 157,346,640  
Corporate debt and marketable equity securities 3,716,053 3,740,235  
Bank debt securities 1,952,015 470,676  
Mutual funds 4,377,508 4,295,403  
Foreign governments securities 528,010 635,390  
Brazilian sovereign bonds 307 1,358,025  
Trading securities 208,847,345 167,846,369  
Derivative financial instruments 46,601 26,632  
Derivatives 46,601 26,632  
Brazilian government securities 103,237,635 59,149,326  
Corporate debt securities 4,786,078 2,470,652  
Bank debt securities 1,086,454 1,063,157  
Brazilian sovereign bonds 728,127 401,214  
Foreign governments securities 3,202,547    
Marketable equity securities and other stocks 4,380,606 3,387,158  
Balance on 117,421,447 66,471,507  
Brazilian government securities 53,841,066 61,812,995  
Corporate debt securities 825,287 3,899,878  
Bank debt securities 4,904,070 4,742,273  
Brazilian sovereign bonds 713,555 102,841  
Financial assets pledged as collateral 60,283,978 70,557,987  
Total 386,599,371 304,902,495  
Level 2      
Financial assets and liabilities measured at fair value      
Brazilian government securities 3,975,816 3,756,680  
Corporate debt and marketable equity securities 8,271,295 6,356,302  
Bank debt securities 6,396,254 18,129,451  
Mutual funds   8,378  
Trading securities 18,643,365 28,250,811  
Derivative financial instruments 13,814,312 16,728,802  
Derivative financial instruments (liabilities) (14,264,124) (13,427,053)  
Derivatives (449,812) 3,301,749  
Corporate debt securities 31,740,856 38,431,230  
Bank debt securities 97,399 495,886  
Marketable equity securities and other stocks 3,261,732 2,706,578  
Balance on 35,099,987 41,633,694  
Total 53,293,540 73,186,254  
Level 3      
Financial assets and liabilities measured at fair value      
Brazilian government securities 4 79  
Corporate debt and marketable equity securities 352,442 287,145  
Trading securities 352,446 287,224  
Derivative financial instruments 5,972 8  
Derivative financial instruments (liabilities) (10,875) (8,625)  
Derivatives (4,903) (8,617)  
Brazilian government securities 44,123 48,702  
Corporate debt securities 3,451,696 1,240,826  
Marketable equity securities and other stocks 3,395,469 3,723,825  
Balance on 6,891,288 5,013,353  
Total R$ 7,238,831 R$ 5,291,960 R$ 6,274,018