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Operating segments (Details Text)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Segments Details Text [Abstract]
Total assets/liabilities and the net income for the year	1.00%
No income from transactions with a single customer or counterparty abroad	10.00%	10.00%	10.00%

X

- Definition

Income from transactions with a single customer or counterparty abroad

+ References

No definition available.

+ Details

Name:	bbd_IncomeFromTransactionsWithSingleCustomerOrCounterpartyAbroad
Namespace Prefix:	bbd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Operating segments (Details Text)

+ References

No definition available.

+ Details

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

X

- Definition

Other operation represents less than 1% of total assets/liabilities and the net income for the year

+ References

No definition available.

+ Details

Name:	bbd_OtherOperation
Namespace Prefix:	bbd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant