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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)

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The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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The amount of long-term employee benefits other than post-employment benefits and termination benefits. Such benefits may include long-term paid absences, jubilee or other long-service benefits, long-term disability benefits, long-term profit-sharing and bonuses and long-term deferred remuneration. [Refer: Employee benefits expense]

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The amount of expense from employee benefits (other than termination benefits), which are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services, that the entity does not separately disclose in the same statement or note. [Refer: Employee benefits expense]

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The amount of fees paid or payable for professional services.

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A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

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The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

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A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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