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Risk and Capital Management - Summary of Composition of the Referential Equity (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of regulatory capital [Line Items]        
Stockholders' equity attributable to controlling interests R$ 136,925 R$ 136,782    
Non-controllinginterests 12,540 13,684    
Total stockholders' equity 149,465 150,466 R$ 144,356 R$ 132,384
Common Equity Tier I 117,328 123,358    
Additional Tier I Capital 11,368 7,796    
Tier I (Common Equity Tier I + Additional Tier I Capital) 128,696 131,154    
Tier II 11,900 15,874    
Referential Equity (Tier I + Tier II) 140,596 147,028    
Referential equity (tier I + tier II) [member]        
Disclosure of regulatory capital [Line Items]        
Stockholders' equity attributable to controlling interests 131,987 131,757    
Non-controllinginterests 11,110 12,276    
Change in interest in subsidiaries in a capital transaction 259 98    
Total stockholders' equity 143,356 144,131    
Common Equity Tier I Prudential Adjustments (26,028) (20,773)    
Common Equity Tier I 117,328 123,358    
Instruments Eligible to Comprise Additional Tier I 11,266 7,701    
Additional Tier I Prudential Adjustments 102 95    
Additional Tier I Capital 11,368 7,796    
Tier I (Common Equity Tier I + Additional Tier I Capital) 128,696 131,154    
Instruments Eligible to Comprise Tier II 11,833 15,778    
Tier II Prudential Adjustments 67 96    
Tier II 11,900 15,874    
Referential Equity (Tier I + Tier II) R$ 140,596 R$ 147,028