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Non-current assets held for sale (Details Text)	12 Months Ended
	Dec. 31, 2017
Noncurrent Assets Held For Sale Details Text [Abstract]
The properties or other non-current assets received in total or partial settlement of the payment obligations of debtors	one year

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- Definition

Non-current assets held for sale (Details Text)

+ References

No definition available.

+ Details

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

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- Definition

Non-operating assets held for sale in auctions

+ References

No definition available.

+ Details

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