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Earnings per share (Details Text) - shares	Mar. 10, 2017	Mar. 10, 2016
Earnings Per Share Details Text [Abstract]
Share bonus	10	10,000

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- Definition

Earnings per share (Details Text)

+ References

No definition available.

+ Details

Name:	bbd_EarningsPerShareDetailsTextAbstract
Namespace Prefix:	bbd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Share bonus

+ References

No definition available.

+ Details

Name:	bbd_ShareBonus
Namespace Prefix:	bbd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant