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Insurance technical provisions and pension plans (Details 8) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes In Deferred Acquisition Cost Insurance Assets [Abstract]
At the beginning of the year	R$ 1,750,244	R$ 1,945,238
Additions	1,586,888	1,940,226
Reversals	(2,250,844)	(2,135,220)
Partial spin-off of large risk portfolio	(16,180)	0
At the end of the year	R$ 1,070,108	R$ 1,750,244

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- Definition

Changes in deferred acquisition cost (insurance assets)

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- Definition

The increase in deferred acquisition costs arising from insurance contracts resulting from amounts of those costs incurred. [Refer: Deferred acquisition costs arising from insurance contracts]

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The amount of costs that an insurer incurs to sell, underwrite and initiate a new insurance contract whose recognition as an expense has been deferred. [Refer: Types of insurance contracts [member]]

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The decrease in deferred acquisition costs arising from insurance contracts resulting from an impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Deferred acquisition costs arising from insurance contracts; Types of insurance contracts [member]]

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