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Personnel expenses (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of employee benefits expense [abstract]      
Salaries R$ (9,170,556) R$ (8,236,617) R$ (6,369,727)
Benefits (5,385,133) (3,625,796) (2,994,155)
Social security charges (3,505,290) (2,862,067) (2,402,112)
Employee profit sharing (1,572,472) (1,451,310) (1,304,958)
Provision for labor claims (927,136) (663,124) (853,660)
Training (162,678) (164,869) (133,435)
Total R$ (20,723,265) R$ (17,003,783) R$ (14,058,047)