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Financial assets and liabilities held for trading (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial Assets Held For Trading [Abstract]    
Brazilian government securities R$ 202,249,272 R$ 161,103,399
Bank debt securities 8,348,269 18,600,127
Corporate debt and marketable equity securities 12,339,790 10,383,682
Mutual funds 4,377,508 4,303,781
Brazilian sovereign bonds 307 1,358,025
Foreign governments securities 528,010 635,390
Derivative financial instruments 13,866,885 16,755,442
Total R$ 241,710,041 R$ 213,139,846