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Other information (Details Text) - BRL (R$)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other information (Details Text)      
Control of the company will be shared - Capital 20.00%    
Investment funds managed by Organization R$ 4,377,508,000 R$ 4,303,781,000  
Consortium which nature and involvement is related to generation management fees of consortium quotas 1,463,469,000 1,079,653,000 R$ 1,054,424,000
Values through the provision of guarantees 104,000,000    
Bradesco Seguros S.A. - Investment totals 490,000,000    
Bradesco Seguros S.A. - Goodwill on the acquisition of shares R$ 126,897,000    
IRB's - Price per share R$ 27.24    
IRB's - Shares were sold in the Base Offering 14,040,000    
IRB's - Supplementary lot totaling shares 16,206,387    
IRB's - Bradesco indirectly holds shares 47,520,213    
Interest in the capital stock of IRB 15.23%    
Special Voluntary Severance Program Scheme (PDVE) - Total cost R$ 2,300,000,000    
The estimated annual effect on personnel expenses is a reduction R$ 1,500,000,000    
Bradesco Seguros      
Other information (Details Text)      
Equity stake 40.00%    
Book entry shares, common and nominative 172,560,054    
Book entry shares, common and nominative in the amount R$ 363,103,000    
Swiss Re Corso      
Other information (Details Text)      
Equity stake 60.00%    
Unconsolidated structured entities      
Other information (Details Text)      
Investment funds managed by Organization R$ 338,846,142,000 426,390,575,000  
Investment funds managed by Organization - Revenues earned 1,463,469,000 1,079,653,000  
Consortium which nature and involvement is related to generation management fees of consortium quotas 74,323,031,000 71,075,119,000  
Consortium which nature and involvement is related to generation management fees of consortium quotas - Revenues R$ 1,526,660,000 R$ 1,278,753,000